Printed matter storage condition adjusting method and device and printed matter storage management system

Abstract

The invention provides a printed matter storage condition adjusting method and device and a printed matter storage management system, and the method comprises the steps: an obtaining step: obtaining a currently collected image of a printed matter to obtain a first target image, and obtaining a last collected image of the printed matter to obtain a second target image; a determination step: according to the first target image and the second target image, determining whether the printed matter has local expansion, cracks, color permeation and color fading; in the adjusting step, under the condition that at least one of local expansion, cracks, color permeation and color fading occurs on the printed matter, the storage condition of the printed matter is adjusted so as to reduce loss of the printed matter, and the problem that in the prior art, the workload of adjusting the storage condition of the printed matter through manual judgment is large is solved.

Description

Technical Field

[0001] The present invention relates to the field of warehousing technology, and in particular to a method and device for adjusting storage conditions of printed matter, a computer-readable storage medium, a computer program product, and a printed matter storage management system. Background Art

[0002] Print storage management is an important part of ensuring the quality of printed materials. Effective storage management methods are conducive to improving work efficiency and reducing the loss and risk of printed materials. In most cases, printed materials are simply placed in a specific storage area in the warehouse. Some storage warehouses will set fixed environmental storage parameters and cannot be adjusted in time according to actual conditions. This often leads to some printed materials being blurred, faded, and discolored due to inappropriate storage conditions. At this time, it is necessary to arrange manual screening to check and pick out problematic printed materials. At the same time, manual work needs to determine what causes what phenomenon, and the manual judgment process is affected by experience, which makes it difficult to standardize the analysis results, resulting in inaccurate analysis or even misjudgment. Manual analysis and corresponding adjustments are made, resulting in unnecessary material loss and increased manual workload. Summary of the invention

[0003] The main purpose of the present application is to provide a method, device, computer-readable storage medium, computer program product and printed matter storage management system for adjusting the storage conditions of printed matter, so as to at least solve the problem of large workload of manual judgment to adjust the storage conditions of printed matter in the prior art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a method for adjusting the storage conditions of printed materials is provided, comprising: an acquisition step, acquiring a currently captured image of the printed material to obtain a first target image, and acquiring an image of the printed material captured last to obtain a second target image; a determination step, determining whether the printed material has local expansion, cracks, color penetration, and fading according to the first target image and the second target image; and an adjustment step, adjusting the storage conditions of the printed material to reduce the loss of the printed material when at least one of local expansion, cracks, color penetration, and fading occurs on the printed material.

[0005] Optionally, determining whether the printed matter has locally expanded based on the first target image and the second target image includes: calculating the area of ​​the printed pattern of the printed matter based on the first target image to obtain the current printed pattern area; calculating the area of ​​the printed pattern of the printed matter based on the second target image to obtain the last printed pattern area; determining that the printed matter may have expanded if the ratio of the current printed pattern area to the last printed pattern area is greater than a first predetermined threshold, the last printed pattern area being the area of ​​the printed pattern in the image of the printed matter acquired last time, and the first predetermined threshold being greater than 1; comparing the outline of the printed pattern of the first target image with the outline of the printed pattern of the second target image to obtain a portion of the first target image where the outline changes; identifying the shape of the portion of the first target image where the outline changes to obtain a recognition result; and determining that the printed matter has locally expanded if the recognition result is spherical.

[0006] Optionally, determining whether the printed product has cracks according to the first target image and the second target image includes: calculating the weights of each pixel point of the first target image to obtain multiple first weights, where the weights are weighted averages of the hue, saturation and brightness of the pixel points; calculating the weights of each pixel point of the second target image to obtain multiple second weights, where the second weights correspond one-to-one to the first weights; calculating the absolute value of the difference between each first weight and the corresponding second weight to obtain multiple differences, where the differences correspond one-to-one to the pixel points; when the ratio of each difference to the corresponding second weight is greater than a second predetermined threshold, determining that the pixel point corresponding to the difference is a first mutation pixel point; performing curve fitting on the first mutation pixel point to obtain a first fitting line segment; and when the length of the first fitting line segment is greater than a predetermined length, determining that the printed product has cracks.

[0007] Optionally, when the length of the first fitting line segment is greater than a predetermined length, it is determined that a crack appears on the printed product, including: when the length of the first fitting line segment is greater than the predetermined length and the first fitting line segment is a curve, it is determined that a crack appears on the printed product; when the length of the first fitting line segment is greater than the predetermined length and the first fitting line segment is a straight line, it is determined that a printing process defect appears on the printed product.

[0008] Optionally, determining whether color penetration occurs in the printed product based on the first target image and the second target image includes: calculating the area of ​​a noisy region of the printed pattern of the printed product based on the first target image to obtain the area of ​​the noisy region, wherein the noisy region is an area caused by color penetration between regions of different colors; determining that the printed product has a noisy phenomenon when a ratio of the area of ​​the noisy region to the area of ​​the printed pattern is greater than a third predetermined threshold; when the printed product has a noisy phenomenon, identifying the boundaries between different colors in the printed pattern of the first target image to obtain a plurality of intersection points; fitting the plurality of intersection points to obtain a second fitting line segment; and determining that color penetration occurs in the printed product when the second fitting line segment is not a straight line.

[0009] Optionally, determining whether the printed product has faded according to the first target image and the second target image includes: calculating the grayscale value of each pixel point according to the first target image to obtain a plurality of first grayscale values; calculating the grayscale value of each pixel point according to the second target image to obtain a plurality of second grayscale values, wherein the second grayscale values ​​correspond to the first grayscale values ​​one-to-one; determining that the pixel point corresponding to the first grayscale value is a second mutation pixel point when a ratio of the first grayscale value to the corresponding second grayscale value is less than a fourth predetermined threshold, and the fourth predetermined threshold is less than 1; determining an area composed of the second mutation pixel points as a faded area, and determining that the printed product has faded.

[0010] Optionally, after determining whether the printed product has faded based on the first target image and the second target image, the method further includes: identifying boundaries of the faded area to obtain multiple faded boundaries; determining the faded boundary that is not the boundary of the printed product among the multiple faded boundaries as a target fading boundary; determining the fading direction within the target fading boundary as the illumination direction, the fading direction being the direction of pixel values ​​of pixel points within the target fading boundary from large to small; determining the degree of fading based on the average pixel values ​​of all pixel points within the target fading boundary; and determining an adjustment strategy for the light intensity in the storage condition based on the illumination direction and the degree of fading.

[0011] Optionally, when at least one of local expansion, cracks, color penetration and fading occurs on the printed matter, the storage conditions of the printed matter are adjusted to reduce the loss of the printed matter, including: when local expansion occurs on the printed matter, the humidity of the storage space of the printed matter is lowered; when cracks occur on the printed matter, the humidity of the storage space of the printed matter is increased; when color penetration occurs on the printed matter, the temperature of the storage space of the printed matter is lowered; when fading occurs on the printed matter, the light intensity of the faded area of ​​the printed matter is lowered or the position of the faded area of ​​the printed matter is adjusted.

[0012] Optionally, when the printed matter locally expands, the humidity of the storage space of the printed matter is lowered; when the printed matter cracks, the humidity of the storage space of the printed matter is increased; when the printed matter has color penetration, the temperature of the storage space of the printed matter is lowered; when the printed matter fades, the light intensity of the faded area of ​​the printed matter is lowered. The method further includes: repeating the acquiring step, the determining step and the adjusting step in sequence at least once until the printed matter does not locally expand, crack, color penetrate and fade.

[0013] According to another aspect of the present application, a storage condition adjustment device for printed matter is provided, comprising: an acquisition unit, configured to execute an acquisition step, acquire a currently captured image of the printed matter to obtain a first target image, and acquire a previously captured image of the printed matter to obtain a second target image; a first determination unit, configured to execute a determination step, and determine whether the printed matter has local expansion, cracks, color penetration, and fading according to the first target image and the second target image; and an adjustment unit, configured to execute an adjustment step, and to adjust the storage condition of the printed matter to reduce the loss of the printed matter when the printed matter has at least one of local expansion, cracks, color penetration, and fading.

[0014] According to another aspect of the present application, a computer program product is provided, comprising a computer program, wherein when the computer program is executed by a processor, any one of the methods described above is implemented.

[0015] According to another aspect of the present application, a printed material storage management system is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of the described methods.

[0016] By applying the technical solution of the present application, the storage condition adjustment method of the above-mentioned printed matter determines whether the printed matter has local expansion, cracks, color penetration and fading by comparing the currently captured image of the printed matter with the image captured last time, that is, comparing the first target image with the second target image, and adjusts the storage condition of the above-mentioned printed matter when at least one of local expansion, cracks, color penetration and fading occurs on the above-mentioned printed matter to reduce the loss of the above-mentioned printed matter and ensure the quality of the printed matter. There is no need for manual judgment to adjust the storage condition, which solves the problem of high workload of manual judgment to adjust the storage condition of the printed matter in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A hardware structure block diagram of a mobile terminal for executing a storage condition adjustment method for printed matter provided in an embodiment of the present application is shown;

[0018] Figure 2 A schematic flow chart of a method for adjusting storage conditions of printed matter provided in accordance with an embodiment of the present application is shown;

[0019] Figure 3 A schematic diagram showing a printing effect of excessive humidity provided in an embodiment of the present application is shown;

[0020] Figure 4 A schematic diagram showing cracking caused by too low humidity according to an embodiment of the present application is shown;

[0021] Figure 5 A schematic diagram showing color penetration caused by excessive temperature provided in an embodiment of the present application is shown;

[0022] Figure 6 A schematic diagram showing the effect of light on fading provided in an embodiment of the present application is shown;

[0023] Figure 7 A structural block diagram of a storage condition adjustment device for printed matter provided according to an embodiment of the present application is shown.

[0024] The above drawings include the following reference numerals:

[0025] 102, processor; 104, memory; 106, transmission device; 108, input and output devices. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] As introduced in the background technology, the workload of manually judging and adjusting the storage conditions of printed materials in the prior art is large. To solve this technical problem, the embodiments of the present application provide a method, device, computer-readable storage medium, computer program product and printed material storage management system for adjusting the storage conditions of printed materials.

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 FIG. 1 is a hardware structure block diagram of a mobile terminal of a method for adjusting storage conditions of printed matter according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1Different configurations shown.

[0032] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the storage condition adjustment method of the printed matter in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, the above method is realized. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0033] In this embodiment, a method for adjusting the storage conditions of printed materials running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0034] Figure 2 FIG. 1 is a flow chart of a method for adjusting storage conditions of printed matter according to an embodiment of the present application. Figure 2 As shown, the method comprises the following steps:

[0035] Step S201, an acquisition step, acquiring a currently acquired image of the printed matter to obtain a first target image, and acquiring a previously acquired image of the printed matter to obtain a second target image;

[0036] Step S202, a determination step, determining whether the printed product has local expansion, cracks, color penetration, and fading according to the first target image and the second target image;

[0037] Step S203, an adjustment step, in which, when the printed matter has at least one of local expansion, cracks, color penetration and fading, the storage conditions of the printed matter are adjusted to reduce the loss of the printed matter.

[0038] In the above-mentioned method for adjusting the storage conditions of printed materials, by comparing the currently captured image of the printed material with the image captured last time, that is, comparing the first target image with the second target image, it is determined whether the printed material has local expansion, cracks, color penetration and fading, and when at least one of the above-mentioned local expansion, cracks, color penetration and fading occurs in the above-mentioned printed material, the storage conditions of the above-mentioned printed material are adjusted to reduce the loss of the above-mentioned printed material and ensure the quality of the printed material. There is no need for manual judgment to adjust the storage conditions, which solves the problem of high workload of manual judgment to adjust the storage conditions of printed materials in the prior art.

[0039] Specifically, the specific process of obtaining the currently captured image of the above-mentioned printed product is as follows: a high-pixel area array camera is selected as the image acquisition entry, because we are concerned about the changing characteristics of the printed product. Usually, the actual size of the printed pattern / font is small, so the pixel of the selected area array camera must be high and the distance between the camera and the surface to be measured must be close, so that the changes in the printed characteristics can be presented through the image. Usually, a camera with more than 25 million pixels is selected. When the camera position is fixed, the actual object can be measured by using a ruler / length, and it is placed still in the camera's field of view and a frame of image is taken. By measuring the pixel value occupied by the ruler, it is converted to obtain: 1 pixel is equal to the actual number of millimeters. For example, 100 pixels = 1mm, which means that the actual size of one pixel represents 0.01mm.

[0040] Setting of image acquisition cycle: When stored in warehouses, the ink of printed products is usually affected by the environment for a long time. Only when the environmental impact accumulates to a certain extent, the printed products will show the corresponding characteristics more obviously. However, when people discover such characteristics, they have been affected too seriously by the environment, and sometimes they cannot be exported as finished products as qualified materials. Therefore, the judgment time interval should not be too small or too large. Generally, a sampling cycle of once a week is adopted to make subsequent judgments on various environmental indicators, especially for the judgment of indicators on lighting conditions. The sampling cycle is set to 4 weeks.

[0041] In order to identify local expansion of a printed product, in an optional implementation, the above step S202 includes:

[0042] Step S2021, calculating the area of ​​the printing pattern of the printed product according to the first target image to obtain the current printing pattern area;

[0043] Step S2022, calculating the area of ​​the printed pattern of the printed product according to the second target image to obtain the area of ​​the last printed pattern;

[0044] Step S2023, when the ratio of the current printed pattern area to the last printed pattern area is greater than a first predetermined threshold, determining that the printed product has a possibility of expansion, the last printed pattern area being the area of ​​the printed pattern in the last acquired image of the printed product, and the first predetermined threshold being greater than 1;

[0045] Step S2024, comparing the outline of the printed pattern of the first target image with the outline of the printed pattern of the second target image to obtain a portion of the first target image where the outline is changed;

[0046] Step S2025, identifying the shape of the portion of the first target image where the contour changes, to obtain a recognition result;

[0047] Step S2026: when the recognition result is a spherical shape, determining that the printed matter is partially expanded.

[0048] In the above embodiment, the ink expansion judgment method is specifically as follows: first, the connected domain area of ​​the printed pattern must be confirmed. When the pattern is represented by a circumscribed rectangle, the length and width of the rectangle must be confirmed. The area of ​​the printed pattern is approximately expressed by the circumscribed rectangle area = length * width. When the printed area changes by more than 1 / 100 of the circumscribed rectangle area, or when one side of the length / width is greater than 1 / 10, it is considered that the ink of the printed product has undergone an expansion change. At this time, if the circumscribed rectangle of the original printed pattern is amm long, bmm wide, and A (a / b / A represents a positive value), when the printed product pattern is compared with the original pattern and changes by more than (1 / 10)*amm in length, more than (1 / 10)*bmm in width, or more than ((1 / 100)*A) in area, it is considered that the printed product ink has undergone a morphological change. 1 pixel = 0.01mm, 1 pixel grid = 0.01*0.01 = 0.0001, then in the camera imaging, when there is a pixel length change of (1 / 10)*a / 0.01 = 10*a or more, or a width change of (1 / 10)*b / 0.01 = 10*b or more, or a pixel area change of ((1 / 100)*A) / (0.01*0.01) = 100*A or more, it is considered that the printed ink has expanded. Since pixels are integers, when 10*a, 10*b, 100*A are non-integers, they should be rounded down. Therefore, the pixel length threshold for determining feature changes is determined to be The width threshold is The area threshold is That is, when the feature change is greater than the above threshold pixels, it is considered that the feature has changed significantly. The edges of standard compliant images are clear-cut. When the humidity of the printed material is too high, the moisture content of the paper will increase, and the moisture in the paper and the pigment on the pattern will be infected and diffused, causing the pattern boundary to swell and bulge. Use a high-pixel camera to capture the printed image at a set interval, first extract the outline of the printed material in the image, and then use the comparison of the printed outline between the two images within the time period to calculate the pixel area where the outline has changed. If the contour change area of ​​the two images during the period exceeds the set length / width / area threshold, it is considered that expansion and bulging may have occurred, and when expansion and bulging occurs, a local spherical expansion will appear on the outline of the printed pattern. This is a divergent characteristic caused by water droplets. Specific examples of discrimination are: Figure 3 As shown, by using contour detection, the contour difference comparison is performed between the normal patterns P1 and P2, and the judgment is made based on the set length / width / area threshold. When the difference between the area S_P2 of P2 and the area S_P1 of P1 exceeds the threshold, it indicates that the printed pattern may have expanded. To further verify that the pattern has expanded due to excessive humidity, based on the characteristic that excessive humidity will cause the pattern to expand in a local spherical shape due to the divergence of water droplets, contour detection is used to first identify the part where the contour of P2 changes relative to P1, and then target detection is used for the part where the contour changes to identify spherical expansion, such as A and B, indicating that the humidity of the storage conditions of the printed product is too high. When it is determined that the humidity of the current storage environment is too high, the result of the storage humidity being too high is returned, and a suggestion to appropriately reduce the humidity of the storage space is output, and the change area is framed. Humidity adjustment: increase or decrease by 1%, and the specific increase or decrease is determined based on the suggestion.

[0049] In order to identify cracks in printed matter, in an optional implementation manner, the above step S202 further includes:

[0050] Step S2027, calculating the weight of each pixel of the first target image to obtain a plurality of first weights, wherein the weight is a weighted average of the hue, saturation and brightness of the pixel;

[0051] Step S2028, calculating the weight of each pixel of the second target image to obtain a plurality of second weights, wherein the second weights correspond one-to-one to the first weights;

[0052] Step S2029, calculating the absolute value of the difference between each of the first weights and the corresponding second weight to obtain a plurality of differences, wherein the differences correspond to the pixel points one by one;

[0053] Step S2030, when the ratio of each of the above differences to the corresponding second weight is greater than a second predetermined threshold, determining the pixel point corresponding to the above difference as a first mutation pixel point;

[0054] Step S2031, performing curve fitting on the first mutation pixel point to obtain a first fitting line segment;

[0055] Step S2032: When the length of the first fitting line segment is greater than a predetermined length, it is determined that a crack occurs in the printed product.

[0056] In the above embodiment, too low humidity in the storage environment will cause the ink to dry too quickly, thereby generating excessive internal stress and causing cracks. A high-pixel camera is used to capture images of printed products at a set interval (set to 1 week), and two images within the period are compared. If the hue, saturation, and brightness of multiple pixels in the pattern in the field of view change (regardless of the break in paper or ink, the weights of the hue + saturation + brightness of the pixels at the mutation point of the break will change, and the change in pixel weights is used to determine the mutation point of the image), these mutation pixels are curve-fitted, and the length of the fitting line segment is greater than the predetermined length, and it is determined that the above printed product has cracks.

[0057] In order to identify cracks in printed matter, in an optional implementation manner, the above step S2032 further includes:

[0058] Step S20291, when the length of the first fitting line segment is greater than the predetermined length and the first fitting line segment is a curve, determining that a crack occurs in the printed product;

[0059] Step S20292: When the length of the first fitting line segment is greater than the predetermined length and the first fitting line segment is a straight line, it is determined that a printing process defect occurs in the printed product.

[0060] In the above implementation, if it fits into a continuous irregular curve, it is determined that cracks have occurred and the current storage environment humidity is low; if it fits into an approximate straight line, it is determined to be a printing process problem (it may be a crack with continuous straight line characteristics due to unstable inking), and corresponding reminders and suggestions are given and the change area is framed. In particular, for linear cracks, the direction vector of the straight line can also be analyzed, and through the parallel relationship of multiple straight line direction vectors, the direction of printing / brush head failures that may cause process inking defects can be suggested, and an arrow for the suggested reference direction (hidden danger direction) is given on the picture. Specific examples are: Figure 4As shown, by calculating the hue, saturation and brightness weights of the printed pattern image, when the printed pattern is detected to be cracked, such as crack A and crack B in the figure, as well as a large number of other cracks, it means that the storage environment humidity is too low; when the printed patterns are all straight stripes, such as straight crack C and straight crack D, there is no problem of too low humidity in the storage conditions. It may be a defect in the printing process of the printed product, unstable inking due to degradation over time, and at the same time, a schematic arrow of the hidden danger direction is given to provide reference suggestions for maintenance personnel so that they can quickly locate the problem factors. Humidity adjustment: increase or decrease by 1%, and the specific increase or decrease is determined based on the suggestions.

[0061] It should be noted that the printed pattern can have both irregular curved cracks and straight lines. When there are only straight lines and there are multiple vectors in the same direction between the straight lines (the number of directions is not limited in this example, that is, there are printing defects in multiple directions, and the number of vectors indicates the number of printing defects), it means that there is no problem of low humidity. As long as there are curved cracks, it means that the humidity is too low.

[0062] In order to identify color penetration in printed matter, in an optional implementation, the above step S202 further includes:

[0063] Step S2033, calculating the area of ​​the mottled region of the printed pattern of the printed product according to the first target image to obtain the area of ​​the mottled region, where the mottled region is a region where color penetration occurs between regions of different colors;

[0064] Step S2034, when the ratio of the area of ​​the mottled region to the area of ​​the printed pattern is greater than a third predetermined threshold, determining that the printed product has a mottled phenomenon;

[0065] Step S2035, in the case where the printed product has a mottled color phenomenon, identifying the boundaries between different colors in the printed pattern of the first target image to obtain a plurality of boundary points;

[0066] Step S2036, fitting the plurality of intersection points to obtain a second fitting line segment;

[0067] Step S2037: When the second fitting line segment is not a straight line, it is determined that color penetration occurs in the printed product.

[0068] In the above embodiment, during the drying process of the ink, the bright quick-drying offset printing ink is mainly dried by oxidation conjunctiva type. There is a fixation stage before the offset printing ink dries. The oxidation polymerization of the ink is an exothermic reaction. When the drying is too fast, a lot of heat will be released. If the heat is released slowly, the heat-sensitive pigment will change color, for example, the golden color ink will darken and lose its original luster. Fading usually manifests itself as a change in the hue and brightness of the color. When two images collected within a cycle are compared, fading is determined when the color brightness and chromaticity of the pure color area change. First, the ink will fade to a certain extent under the irradiation of sunlight or other light sources. The ink with good light resistance can better resist fading, and the change in temperature will affect the chemical structure of the ink, thereby affecting its light resistance. The high temperature environment will accelerate the aging process of the ink, resulting in faster fading; second, the cellulose in the paper is more likely to undergo hydrolysis and oxidation in a high temperature environment. These reactions will cause the paper print to fade seriously, so high temperature will aggravate the fading phenomenon to a certain extent. According to this analysis, if the printed product fades within a short period (one week), the impact of temperature is greater than that of light. Therefore, it can be determined that the fading is caused by temperature. At this time, a reminder is given to suggest that the temperature is very likely too high, and the risk of fading is greater than the risk of light, and the change area is framed. When the temperature is too high, the movement of pigment molecules on color prints becomes stronger, which can cause different colors to penetrate each other, resulting in mottled patterns or blurred boundaries between different colors. By comparing whether there is mottled color in the overlapping parts of the colored areas of the two pictures within the period, the color value is obtained by calculating the weighted average of the three primary colors of each pixel. If the color value changes by more than 10%, it is determined that the color of the pixel is mottled. The pixel area where the mottled color appears is calculated. If the set length / width / area threshold is reached, it is considered that mottled color has indeed occurred, and it is determined that the current ambient temperature is too high, and a suggestion to lower the ambient temperature is output. Specific examples: Figure 5As shown, under normal circumstances, the contour line of the color band adjacent area C where the color area A overlaps with the color area B is flat and smooth. When color penetration occurs, the color penetration at the junction will be uneven and the contour line will be uneven, such as the color penetration parts P1 and P2. The color band adjacent area C in the pattern within the cycle is analyzed and processed. First, the contour line of the color band adjacent area C is extracted. By comparing the contour line differences within the cycle, the penetration parts P1 and P2 are found. The contour line of each penetration part is analyzed: first, after expansion and corrosion processing, the P1 and P2 areas are tested for straight lines. If the contour line of the penetration part cannot find a straight line (the overall contour fitting of area C is not a straight line), it is considered that a more obvious color penetration phenomenon has indeed occurred, that is, after expansion and corrosion, the P1 area will find a straight line, while the P2 area still presents an irregular curve. When the temperature is too high, the moisture of the paper is evaporated, which will cause the color to be oxidized and yellowed. When it is found that the color area on the two pictures within the cycle has a color difference change and is biased towards yellow, it is considered that the current print has been oxidized, and the current temperature is judged to be too high, and it is recommended to reduce the output environment temperature. Temperature adjustment: minus 0.2 degrees. It is recommended to make a comprehensive judgment for each step without counting the accumulation. That is, when three types of over-temperature phenomena occur at the same time in the same cycle, only one temperature reduction is performed.

[0069] In order to identify the fading of printed matter, in an optional implementation, the above step S202 further includes:

[0070] Step S2032, calculating the grayscale value of each pixel point according to the first target image to obtain a plurality of first grayscale values;

[0071] Step S2033, calculating the grayscale value of each pixel point according to the second target image to obtain a plurality of second grayscale values, wherein the second grayscale values ​​correspond to the first grayscale values ​​one by one;

[0072] Step S2034, when the ratio of the first gray value to the corresponding second gray value is less than a fourth predetermined threshold, determining that the pixel corresponding to the first gray value is a second mutation pixel, and the fourth predetermined threshold is less than 1;

[0073] Step S2035: determining the area formed by the second mutation pixel points as a faded area, and determining that the printed product is faded.

[0074] In the above-mentioned implementation, the color and brightness of the ink will change to varying degrees under the irradiation of sunlight. There is no ink that is absolutely light-resistant and does not change its hue. Under the action of strong sunlight, the color of all inks will change to varying degrees. Under the action of ultraviolet rays from sunlight, the ink has poor light resistance, loses its original bright color, and becomes lighter to grayish white. Especially for light-colored inks and four-color overprinting, yellow and red fade faster, while cyan and black fade slower, so the overall color tone tends to be grayish white. By analyzing the printing area of ​​two images in a certain cycle, whether the hue of the image in the latter cycle is more grayish white than that of the image in the previous cycle, and whether the pixel area of ​​the color-changing area reaches the set threshold, if so, it is considered that fading due to light has occurred, and corresponding reminders and suggestions are given and the changed area is framed. It should be noted that the fading period caused by light is longer than that caused by temperature. It is generally believed that significant changes can be observed for at least 4 weeks, that is, the sampling period for analyzing the light reasons here is 4 weeks. If the pattern analyzed after 4 weeks fades to grayish white, that is, the grayish white chromaticity weight increases and the brightness increases, it is considered that there is a high probability that the color pattern has faded due to the influence of light. Management advice is given: Fading due to light has occurred in this area, and it is recommended to change the storage location. The color of a solid color pattern will gradually fade and disappear when exposed to light for a long time, because the ultraviolet rays in the light will cause the molecular bonds of the pigment molecules to break. We hope to focus on the gradual disappearance process, be able to discover and give timely lighting suggestions (avoid light, change storage location) during the process. For solid color prints, especially black, the fading characteristics are not as obvious as those of color prints. Therefore, the pixel mutation area is found through the structural direction of the print. When the gray value difference between the two pixels reaches 10% of the difference in the corresponding position of the previous cycle image, it is considered that a significant change has occurred. The pixel point is used as the mutation pixel point, and the fading area can be determined by the boundary outline of the mutation pixel point.

[0075] In order to set a suitable detection cycle, in an optional implementation manner, after determining whether the printed product is faded according to the first target image and the second target image, the method further includes:

[0076] Step S301, identifying the boundary of the faded area to obtain a plurality of faded boundaries;

[0077] Step S302, determining the faded boundary among the plurality of faded boundaries that is not a boundary of the printed product as a target faded boundary;

[0078] Step S303, determining the fading direction within the target fading boundary as the illumination direction, wherein the fading direction is the direction from large to small of the pixel values ​​of the pixel points within the target fading boundary;

[0079] Step S304, determining the fading degree according to the average pixel value of all pixels within the target fading boundary;

[0080] Step S305: determining a strategy for adjusting the light intensity in the storage condition according to the light direction and the fading degree.

[0081] In the above implementation, the direction of the light and the fading intensity of the printed area affected by the light are determined by changing the boundary contour of the pixel points and the distribution of the pixel values. Figure 6 As shown, according to grayscale calculation, the mutation pixel points are identified, and the boundaries of the mutation pixel points are fitted, such as the boundaries A and B in the figure. Then, according to the pixel distribution trend within the fitted boundaries, the data trend is determined according to data statistics and data regression methods, that is, the direction of the illumination is clarified. According to the illumination direction D in the figure and the fitted boundaries A and B, it is clarified that the boundaries A and B are significantly affected by the illumination, and along the D direction, the fading caused by the illumination gradually weakens (the larger the value, the lighter the color, and the more obvious the influence of the illumination). At the same time, according to the change direction of the fading, that is, the pixel values ​​of the pixels within the boundaries A and B are from large to small, the direction of the illumination is determined, and the location of the illumination source is determined to be the opposite direction of D. At the same time, according to the average pixel value of all pixels in the boundaries A and B, as the basis for the degree of fading caused by the illumination, the intensity of the illumination is adjusted or the light shielding is performed. It should be noted that the example only takes as an example only one illumination-affected area surrounded by the boundaries A and B, but there may be more than one illumination source, and there may be multiple illumination-affected areas, but the detection logic can be as described above in this embodiment. By finding the sudden pixel points on the image, it is determined that the lighting conditions at this time affect the preservation of the print, and accordingly output the suggestions of avoiding light / changing the storage location and frame the sudden change area. When the color print fades, the framed change area is output and the suggestions of avoiding light / changing the storage location are given. When the solid color print fades, the framed change area is output and the lighting direction is given, and the potential light source direction is given according to the lighting direction. In particular, if the light source is controllable, the light source intensity can be reduced / the light source angle can be adjusted according to this suggestion, reducing 50 lux each time / adjusting the light source direction away from the stored print.

[0082] In order to ensure the quality of printed products, in an optional implementation, the above step S203 includes:

[0083] Step S2031, when the above-mentioned printed matter has local expansion, the humidity of the storage space of the above-mentioned printed matter is lowered; when the above-mentioned printed matter has cracks, the humidity of the storage space of the above-mentioned printed matter is increased; when the above-mentioned printed matter has color penetration, the temperature of the storage space of the above-mentioned printed matter is lowered; when the above-mentioned printed matter has faded, the light intensity of the faded area of ​​the above-mentioned printed matter is lowered or the position of the faded area of ​​the above-mentioned printed matter is adjusted.

[0084] In the above-mentioned embodiment, when the printed matter locally expands, the humidity of the storage space of the printed matter is lowered; when the printed matter cracks, the humidity of the storage space of the printed matter is increased; when the printed matter has color penetration, the temperature of the storage space of the printed matter is lowered; when the printed matter fades, the light intensity of the faded area of ​​the printed matter is lowered, thereby achieving storage condition adjustment of the printed matter and ensuring the quality of the printed matter.

[0085] In order to set a suitable detection cycle, in an optional implementation, when the printed matter locally expands, the humidity of the storage space of the printed matter is reduced; when the printed matter cracks, the humidity of the storage space of the printed matter is increased; when the printed matter has color penetration, the temperature of the storage space of the printed matter is reduced; when the printed matter fades, the light intensity of the faded area of ​​the printed matter is reduced, and the method further includes:

[0086] Step S401, repeating the above-mentioned acquisition step, the above-mentioned determination step and the above-mentioned adjustment step at least once in sequence until the above-mentioned printed product has no local expansion, no cracks, no color penetration and no fading.

[0087] In the above implementation mode, when stored in a warehouse, the ink of printed products is usually affected by the environment for a long time. Only when the environmental impact accumulates to a certain extent, the printed products will show corresponding characteristics more obviously. However, when people discover such characteristics, they have been affected too seriously by the environment, and sometimes they cannot even be exported as finished products that have passed the inspection. Therefore, the time interval for judgment should not be too small or too large. Generally, a sampling cycle of once a week is adopted to make subsequent judgments on various environmental indicators, especially for the judgment of indicators on lighting conditions, and the sampling cycle is set to 4 weeks.

[0088] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0089] The embodiment of the present application also provides a storage condition adjustment device for printed materials. It should be noted that the storage condition adjustment device for printed materials in the embodiment of the present application can be used to execute the storage condition adjustment method for printed materials provided in the embodiment of the present application. The device is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0090] The following is an introduction to the storage condition adjustment device for printed materials provided in an embodiment of the present application.

[0091] Figure 7 is a structural block diagram of a storage condition adjustment device for printed matter according to an embodiment of the present application. Figure 7 As shown, the device comprises:

[0092] The acquisition unit 10 is used to execute the acquisition step, acquire the currently acquired image of the printed product to obtain the first target image, and acquire the last acquired image of the printed product to obtain the second target image;

[0093] A first determining unit 20 is used to perform a determining step to determine whether the printed product has local expansion, cracks, color penetration, and fading according to the first target image and the second target image;

[0094] The adjustment unit 30 is used to perform an adjustment step to adjust the storage conditions of the printed matter to reduce the loss of the printed matter when the printed matter has at least one of local expansion, cracks, color penetration and fading.

[0095] In the storage condition adjustment device for the above-mentioned printed matter, by comparing the currently captured image of the printed matter with the image captured last time, that is, comparing the first target image with the second target image, it is determined whether the printed matter has local expansion, cracks, color penetration and fading, and when at least one of the above-mentioned local expansion, cracks, color penetration and fading occurs in the above-mentioned printed matter, the storage condition of the above-mentioned printed matter is adjusted to reduce the loss of the above-mentioned printed matter and ensure the quality of the printed matter. There is no need for manual judgment to adjust the storage conditions, which solves the problem of high workload of manual judgment to adjust the storage conditions of printed matters in the prior art.

[0096] Specifically, the specific process of obtaining the currently captured image of the above-mentioned printed product is as follows: a high-pixel area array camera is selected as the image acquisition entry, because we are concerned about the changing characteristics of the printed product. Usually, the actual size of the printed pattern / font is small, so the pixel of the selected area array camera must be high and the distance between the camera and the surface to be measured must be close, so that the changes in the printed characteristics can be presented through the image. Usually, a camera with more than 25 million pixels is selected. When the camera position is fixed, the actual object can be measured by using a ruler / length, and it is placed still in the camera's field of view and a frame of image is taken. By measuring the pixel value occupied by the ruler, it is converted to obtain: 1 pixel is equal to the actual number of millimeters. For example, 100 pixels = 1mm, which means that the actual size of one pixel represents 0.01mm.

[0097] Setting of image acquisition cycle: When stored in warehouses, the ink of printed products is usually affected by the environment for a long time. Only when the environmental impact accumulates to a certain extent, the printed products will show the corresponding characteristics more obviously. However, when people discover such characteristics, they have been affected too seriously by the environment, and sometimes they cannot be exported as finished products as qualified materials. Therefore, the judgment time interval should not be too small or too large. Generally, a sampling cycle of once a week is adopted to make subsequent judgments on various environmental indicators, especially for the judgment of indicators on lighting conditions. The sampling cycle is set to 4 weeks.

[0098] In order to identify local expansion of a printed product, in an optional implementation manner, the first determining unit includes:

[0099] A first calculation module, used for calculating the area of ​​the printing pattern of the printed product according to the first target image to obtain the current printing pattern area;

[0100] A second calculation module is used to calculate the area of ​​the printed pattern of the printed product according to the second target image to obtain the area of ​​the last printed pattern;

[0101] A first determination module is used to determine that the printed product has a possibility of expansion when the ratio of the current printed pattern area to the last printed pattern area is greater than a first predetermined threshold, the last printed pattern area is the area of ​​the printed pattern in the image of the printed product acquired last time, and the first predetermined threshold is greater than 1;

[0102] An analysis module, used to compare the outline of the printed pattern of the first target image with the outline of the printed pattern of the second target image to obtain a portion of the first target image where the outline changes;

[0103] A first recognition module is used to recognize the shape of the part with contour changes in the first target image to obtain a recognition result;

[0104] The second determination module is used to determine that the printed matter has partially expanded when the recognition result is a spherical shape.

[0105] In the above embodiment, the ink expansion judgment method is specifically as follows: first, the connected domain area of ​​the printed pattern must be confirmed. When the pattern is represented by a circumscribed rectangle, the length and width of the rectangle must be confirmed. The area of ​​the printed pattern is approximately expressed by the circumscribed rectangle area = length * width. When the printed area changes by more than 1 / 100 of the circumscribed rectangle area, or when one side of the length / width is greater than 1 / 10, it is considered that the ink of the printed product has undergone an expansion change. At this time, if the circumscribed rectangle of the original printed pattern is amm long, bmm wide, and A (a / b / A represents a positive value), when the printed product pattern is compared with the original pattern and changes by more than (1 / 10)*amm in length, more than (1 / 10)*bmm in width, or more than ((1 / 100)*A) in area, it is considered that the printed product ink has undergone a morphological change. 1 pixel = 0.01mm, 1 pixel grid = 0.01*0.01 = 0.0001, then in the camera imaging, when there is a pixel length change of (1 / 10)*a / 0.01 = 10*a or more, or a width change of (1 / 10)*b / 0.01 = 10*b or more, or a pixel area change of ((1 / 100)*A) / (0.01*0.01) = 100*A or more, it is considered that the printed ink has expanded. Since pixels are integers, when 10*a, 10*b, 100*A are non-integers, they should be rounded down. Therefore, the pixel length threshold for determining feature changes is determined to be The width threshold is The area threshold is That is, when the feature change is greater than the above threshold pixels, it is considered that the feature has changed significantly. The edges of standard compliant images are clear-cut. When the humidity of the printed material is too high, the moisture content of the paper will increase, and the moisture in the paper and the pigment on the pattern will be infected and diffused, causing the pattern boundary to swell and bulge. Use a high-pixel camera to capture the printed image at a set interval, first extract the outline of the printed material in the image, and then use the comparison of the printed outline between the two images within the time period to calculate the pixel area where the outline has changed. If the contour change area of ​​the two images during the period exceeds the set length / width / area threshold, it is considered that expansion and bulging may have occurred, and when expansion and bulging occurs, a local spherical expansion will appear on the outline of the printed pattern. This is a divergent characteristic caused by water droplets. Specific examples of discrimination are: Figure 3As shown, by using contour detection, the contour difference comparison is performed between the normal patterns P1 and P2, and the judgment is made based on the set length / width / area threshold. When the difference between the area S_P2 of P2 and the area S_P1 of P1 exceeds the threshold, it indicates that the printed pattern may have expanded. To further verify that the pattern has expanded due to excessive humidity, based on the characteristic that excessive humidity will cause the pattern to expand in a local spherical shape due to the divergence of water droplets, contour detection is used to first identify the part where the contour of P2 changes relative to P1, and then target detection is used for the part where the contour changes to identify spherical expansion, such as A and B, indicating that the humidity of the storage conditions of the printed product is too high. When it is determined that the humidity of the current storage environment is too high, the result of the storage humidity being too high is returned, and a suggestion to appropriately reduce the humidity of the storage space is output, and the change area is framed. Humidity adjustment: increase or decrease by 1%, and the specific increase or decrease is determined based on the suggestion.

[0106] In order to identify cracks in a printed product, in an optional implementation manner, the first determining unit further includes:

[0107] A third calculation module is used to calculate the weight of each pixel of the first target image to obtain a plurality of first weights, wherein the weight is a weighted average of the hue, saturation and brightness of the pixel;

[0108] A fourth calculation module, used for calculating the weight of each pixel of the second target image to obtain a plurality of second weights, wherein the second weights correspond to the first weights one by one;

[0109] a fifth calculation module, configured to calculate an absolute value of a difference between each of the first weights and the corresponding second weight to obtain a plurality of differences, wherein the differences correspond to the pixel points one by one;

[0110] A sixth calculation module, configured to determine, when a ratio of each of the above differences to the corresponding second weight is greater than a second predetermined threshold, that the pixel point corresponding to the above difference is a first mutation pixel point;

[0111] A first fitting module, used for performing curve fitting on the first mutation pixel point to obtain a first fitting line segment;

[0112] The third determination module is used to determine that cracks occur in the printed product when the length of the first fitting line segment is greater than a predetermined length.

[0113] In the above embodiment, too low humidity in the storage environment will cause the ink to dry too quickly, thereby generating excessive internal stress and causing cracks. A high-pixel camera is used to capture images of printed products at a set interval (set to 1 week), and two images within the period are compared. If the hue, saturation, and brightness of multiple pixels in the pattern in the field of view change (regardless of the break in paper or ink, the weights of the hue + saturation + brightness of the pixels at the mutation point of the break will change, and the change in pixel weights is used to determine the mutation point of the image), these mutation pixels are curve-fitted, and the length of the fitting line segment is greater than the predetermined length, and it is determined that the above printed product has cracks.

[0114] In order to identify cracks in a printed product, in an optional implementation manner, the third determination module further includes:

[0115] A first determination submodule, configured to determine that a crack occurs on the printed product when the length of the first fitting line segment is greater than the predetermined length and the first fitting line segment is a curve;

[0116] The second determination submodule is used to determine that a printing process defect occurs on the printed product when the length of the first fitting line segment is greater than the predetermined length and the first fitting line segment is a straight line.

[0117] In the above implementation, if it fits into a continuous irregular curve, it is determined that cracks have occurred and the current storage environment humidity is low; if it fits into an approximate straight line, it is determined to be a printing process problem (it may be a crack with continuous straight line characteristics due to unstable inking), and corresponding reminders and suggestions are given and the change area is framed. In particular, for linear cracks, the direction vector of the straight line can also be analyzed, and through the parallel relationship of multiple straight line direction vectors, the direction of printing / brush head failures that may cause process inking defects can be suggested, and an arrow for the suggested reference direction (hidden danger direction) is given on the picture. Specific examples are: Figure 4 As shown, by calculating the hue, saturation and brightness weights of the printed pattern image, when the printed pattern is detected to be cracked, such as crack A and crack B in the figure, as well as a large number of other cracks, it means that the storage environment humidity is too low; when the printed patterns are all straight stripes, such as straight crack C and straight crack D, there is no problem of too low humidity in the storage conditions. It may be a defect in the printing process of the printed product, unstable inking due to degradation over time, and at the same time, a schematic arrow of the hidden danger direction is given to provide reference suggestions for maintenance personnel so that they can quickly locate the problem factors. Humidity adjustment: increase or decrease by 1%, and the specific increase or decrease is determined based on the suggestions.

[0118] It should be noted that the printed pattern can have both irregular curved cracks and straight lines. When there are only straight lines and there are multiple vectors in the same direction between the straight lines (the number of directions is not limited in this example, that is, there are printing defects in multiple directions, and the number of vectors indicates the number of printing defects), it means that there is no problem of low humidity. As long as there are curved cracks, it means that the humidity is too low.

[0119] In order to identify color penetration of printed matter, in an optional implementation manner, the first determination unit further includes:

[0120] a seventh calculation module, configured to calculate the area of ​​the mottled region of the printed pattern of the printed product according to the first target image to obtain the area of ​​the mottled region, wherein the mottled region is a region where color penetration occurs between regions of different colors;

[0121] a fourth determination module, configured to determine that the printed product has a mottled color phenomenon when the ratio of the area of ​​the mottled region to the area of ​​the printed pattern is greater than a third predetermined threshold;

[0122] A second recognition module is used to identify the boundaries between different colors in the printed pattern of the first target image to obtain a plurality of boundary points when the printed product has a mottled color phenomenon;

[0123] A second fitting module is used to fit the plurality of intersection points to obtain a second fitting line segment;

[0124] The fifth determination module is used to determine that color bleeding occurs in the printed product when the second fitting line segment is not a straight line.

[0125] In the above embodiment, during the drying process of the ink, the bright quick-drying offset printing ink is mainly dried by oxidation conjunctiva type. There is a fixation stage before the offset printing ink dries. The oxidation polymerization of the ink is an exothermic reaction. When the drying is too fast, a lot of heat will be released. If the heat is released slowly, the heat-sensitive pigment will change color, for example, the golden color ink will darken and lose its original luster. Fading usually manifests itself as a change in the hue and brightness of the color. When two images collected within a cycle are compared, fading is determined when the color brightness and chromaticity of the pure color area change. First, the ink will fade to a certain extent under the irradiation of sunlight or other light sources. The ink with good light resistance can better resist fading, and the change in temperature will affect the chemical structure of the ink, thereby affecting its light resistance. The high temperature environment will accelerate the aging process of the ink, resulting in faster fading; second, the cellulose in the paper is more likely to undergo hydrolysis and oxidation in a high temperature environment. These reactions will cause the paper print to fade seriously, so high temperature will aggravate the fading phenomenon to a certain extent. According to this analysis, if the printed product fades within a short period (one week), the impact of temperature is greater than that of light. Therefore, it can be determined that the fading is caused by temperature. At this time, a reminder is given to suggest that the temperature is very likely too high, and the risk of fading is greater than the risk of light, and the change area is framed. When the temperature is too high, the movement of pigment molecules on color prints becomes stronger, which can cause different colors to penetrate each other, resulting in mottled patterns or blurred boundaries between different colors. By comparing whether there is mottled color in the overlapping parts of the colored areas of the two pictures within the period, the color value is obtained by calculating the weighted average of the three primary colors of each pixel. If the color value changes by more than 10%, it is determined that the color of the pixel is mottled. The pixel area where the mottled color appears is calculated. If the set length / width / area threshold is reached, it is considered that mottled color has indeed occurred, and it is determined that the current ambient temperature is too high, and a suggestion to lower the ambient temperature is output. Specific examples: Figure 5As shown, under normal circumstances, the contour line of the color band adjacent area C where the color area A overlaps with the color area B is flat and smooth. When color penetration occurs, the color penetration at the junction will be uneven and the contour line will be uneven, such as the color penetration parts P1 and P2. The color band adjacent area C in the pattern within the cycle is analyzed and processed. First, the contour line of the color band adjacent area C is extracted. By comparing the contour line differences within the cycle, the penetration parts P1 and P2 are found. The contour line of each penetration part is analyzed: first, after expansion and corrosion processing, the P1 and P2 areas are tested for straight lines. If the contour line of the penetration part cannot find a straight line (the overall contour fitting of area C is not a straight line), it is considered that a more obvious color penetration phenomenon has indeed occurred, that is, after expansion and corrosion, the P1 area will find a straight line, while the P2 area still presents an irregular curve. When the temperature is too high, the moisture of the paper is evaporated, which will cause the color to be oxidized and yellowed. When it is found that the color area on the two pictures within the cycle has a color difference change and is biased towards yellow, it is considered that the current print has been oxidized, and the current temperature is judged to be too high, and it is recommended to reduce the output environment temperature. Temperature adjustment: minus 0.2 degrees. It is recommended to make a comprehensive judgment for each step without counting the accumulation. That is, when three types of over-temperature phenomena occur at the same time in the same cycle, only one temperature reduction is performed.

[0126] In order to identify the fading of printed matter, in an optional implementation manner, the first determination unit further includes:

[0127] an eighth calculation module, configured to calculate the grayscale value of each pixel point according to the first target image to obtain a plurality of first grayscale values;

[0128] A ninth calculation module, used for calculating the grayscale value of each pixel point according to the second target image to obtain a plurality of second grayscale values, wherein the second grayscale values ​​correspond to the first grayscale values ​​one by one;

[0129] a fourth determination module, configured to determine that the pixel point corresponding to the first grayscale value is a second mutation pixel point when the ratio of the first grayscale value to the corresponding second grayscale value is less than a fourth predetermined threshold, and the fourth predetermined threshold is less than 1;

[0130] The fifth determination module is used to determine the area composed of the second mutation pixel points as the faded area, and determine that the printed product has faded.

[0131] In the above-mentioned implementation, the color and brightness of the ink will change to varying degrees under the irradiation of sunlight. There is no ink that is absolutely light-resistant and does not change its hue. Under the action of strong sunlight, the color of all inks will change to varying degrees. Under the action of ultraviolet rays from sunlight, the ink has poor light resistance, loses its original bright color, and becomes lighter to grayish white. Especially for light-colored inks and four-color overprinting, yellow and red fade faster, while cyan and black fade slower, so the overall color tone tends to be grayish white. By analyzing the printing area of ​​two images in a certain cycle, whether the hue of the image in the latter cycle is more grayish white than that of the image in the previous cycle, and whether the pixel area of ​​the color-changing area reaches the set threshold, if so, it is considered that fading due to light has occurred, and corresponding reminders and suggestions are given and the changed area is framed. It should be noted that the fading period caused by light is longer than that caused by temperature. It is generally believed that significant changes can be observed for at least 4 weeks, that is, the sampling period for analyzing the light reasons here is 4 weeks. If the pattern analyzed after 4 weeks fades to grayish white, that is, the grayish white chromaticity weight increases and the brightness increases, it is considered that there is a high probability that the color pattern has faded due to the influence of light. Management advice is given: Fading due to light has occurred in this area, and it is recommended to change the storage location. The color of a solid color pattern will gradually fade and disappear when exposed to light for a long time, because the ultraviolet rays in the light will cause the molecular bonds of the pigment molecules to break. We hope to focus on the gradual disappearance process, be able to discover and give timely lighting suggestions (avoid light, change storage location) during the process. For solid color prints, especially black, the fading characteristics will not be as obvious as those of color prints. Therefore, the pixel mutation area is found through the structural direction of the print. When the gray value difference between the two pixels reaches 10% of the difference in the corresponding position of the previous cycle image, it is considered that a significant change has occurred. The pixel point is used as the mutation pixel point, and the fading area is determined by the boundary contour of the mutation pixel point, that is, the boundary contour of the mutation pixel point.

[0132] In order to set a suitable detection cycle, in an optional implementation manner, the above device further includes:

[0133] an identification unit, configured to identify the boundary of the faded area to obtain a plurality of faded boundaries after determining whether the printed product has faded according to the first target image and the second target image;

[0134] A second determining unit, configured to determine the faded boundary among the plurality of faded boundaries that is not a boundary of the printed product as a target faded boundary;

[0135] A third determining unit is used to determine the fading direction within the target fading boundary as the illumination direction, wherein the fading direction is the direction from large to small of the pixel values ​​of the pixel points within the target fading boundary;

[0136] A fourth determining unit, configured to determine the fading degree according to an average value of pixel values ​​of all pixels within the target fading boundary;

[0137] A fifth determining unit is used to determine an adjustment strategy for the light intensity in the above storage condition according to the above light direction and the above fading degree.

[0138] In the above implementation, the direction of the light and the fading intensity of the printed area affected by the light are determined by changing the boundary contour of the pixel points and the distribution of the pixel values. Figure 6 As shown, according to grayscale calculation, the mutation pixel points are identified, and the boundaries of the mutation pixel points are fitted, such as the boundaries A and B in the figure. Then, according to the pixel distribution trend within the fitted boundaries, the data trend is determined according to data statistics and data regression methods, that is, the direction of the illumination is clarified. According to the illumination direction D in the figure and the fitted boundaries A and B, it is clarified that the boundaries A and B are significantly affected by the illumination, and along the D direction, the fading caused by the illumination gradually weakens (the larger the value, the lighter the color, and the more obvious the influence of the illumination). At the same time, according to the change direction of the fading, that is, the pixel values ​​of the pixels within the boundaries A and B are from large to small, the direction of the illumination is determined, and the location of the illumination source is determined to be the opposite direction of D. At the same time, according to the average pixel value of all pixels in the boundaries A and B, as the basis for the degree of fading caused by the illumination, the intensity of the illumination is adjusted or the light shielding is performed. It should be noted that the example only takes as an example only one illumination-affected area surrounded by the boundaries A and B, but there may be more than one illumination source, and there may be multiple illumination-affected areas, but the detection logic can be as described above in this embodiment. By finding the sudden pixel points on the image, it is determined that the lighting conditions at this time affect the preservation of the print, and accordingly output the suggestions of avoiding light / changing the storage location and frame the sudden change area. When the color print fades, the framed change area is output and the suggestions of avoiding light / changing the storage location are given. When the solid color print fades, the framed change area is output and the lighting direction is given, and the potential light source direction is given according to the lighting direction. In particular, if the light source is controllable, the light source intensity can be reduced / the light source angle can be adjusted according to this suggestion, reducing 50 lux each time / adjusting the light source direction away from the stored print.

[0139] In order to ensure the quality of printed products, in an optional implementation, the adjustment unit includes:

[0140] The regulating module is used to reduce the humidity of the storage space of the printed matter when the printed matter partially expands, to increase the humidity of the storage space of the printed matter when cracks appear on the printed matter, to reduce the temperature of the storage space of the printed matter when color penetration occurs on the printed matter, and to reduce the light intensity of the faded area of ​​the printed matter or adjust the position of the faded area of ​​the printed matter when fading occurs.

[0141] In the above-mentioned embodiment, when the printed matter locally expands, the humidity of the storage space of the printed matter is lowered; when the printed matter cracks, the humidity of the storage space of the printed matter is increased; when the printed matter has color penetration, the temperature of the storage space of the printed matter is lowered; when the printed matter fades, the light intensity of the faded area of ​​the printed matter is lowered, thereby achieving storage condition adjustment of the printed matter and ensuring the quality of the printed matter.

[0142] In order to set a suitable detection cycle, in an optional implementation manner, the above device further includes:

[0143] The repeating unit is used to reduce the humidity of the storage space of the printed matter when the printed matter has local expansion, increase the humidity of the storage space of the printed matter when cracks appear on the printed matter, reduce the temperature of the storage space of the printed matter when color penetration appears on the printed matter, and reduce the light intensity of the faded area of ​​the printed matter when fading appears on the printed matter, and then repeat the acquisition step, the determination step and the adjustment step at least once in sequence until the printed matter has no local expansion, no cracks, no color penetration and no fading.

[0144] In the above implementation mode, when stored in a warehouse, the ink of printed products is usually affected by the environment for a long time. Only when the environmental impact accumulates to a certain extent, the printed products will show corresponding characteristics more obviously. However, when people discover such characteristics, they have been affected too seriously by the environment, and sometimes they cannot even be exported as finished products that have passed the inspection. Therefore, the time interval for judgment should not be too small or too large. Generally, a sampling cycle of once a week is adopted to make subsequent judgments on various environmental indicators, especially for the judgment of indicators on lighting conditions, and the sampling cycle is set to 4 weeks.

[0145] The storage condition adjustment device for printed matter comprises a processor and a memory, wherein the acquisition unit, the first determination unit and the adjustment unit are stored in the memory as program units, and the processor executes the program units stored in the memory to implement corresponding functions. The modules are all located in the same processor; or, the modules are located in different processors in any combination.

[0146] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be provided, and the problem of heavy workload of manually judging and adjusting the storage conditions of printed products in the prior art can be solved by adjusting kernel parameters.

[0147] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0148] An embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the storage condition adjustment method of the printed matter.

[0149] Specifically, the method for adjusting the storage conditions of printed matter includes:

[0150] Step S201, an acquisition step, acquiring a currently acquired image of the printed matter to obtain a first target image, and acquiring a previously acquired image of the printed matter to obtain a second target image;

[0151] Step S202, a determination step, determining whether the printed product has local expansion, cracks, color penetration, and fading according to the first target image and the second target image;

[0152] Step S203, an adjustment step, in which, when the printed matter has at least one of local expansion, cracks, color penetration and fading, the storage conditions of the printed matter are adjusted to reduce the loss of the printed matter.

[0153] An embodiment of the present invention provides a processor, and the processor is used to run a program, wherein the storage condition adjustment method of the printed product is executed when the program is run.

[0154] Specifically, the method for adjusting the storage conditions of printed matter includes:

[0155] Step S201, an acquisition step, acquiring a currently acquired image of the printed matter to obtain a first target image, and acquiring a previously acquired image of the printed matter to obtain a second target image;

[0156] Step S202, a determination step, determining whether the printed product has local expansion, cracks, color penetration, and fading according to the first target image and the second target image;

[0157] Step S203, an adjustment step, in which, when the printed matter has at least one of local expansion, cracks, color penetration and fading, the storage conditions of the printed matter are adjusted to reduce the loss of the printed matter.

[0158] An embodiment of the present invention provides a printed matter storage management system, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, at least the following steps are implemented:

[0159] Step S201, an acquisition step, acquiring a currently acquired image of the printed matter to obtain a first target image, and acquiring a previously acquired image of the printed matter to obtain a second target image;

[0160] Step S202, a determination step, determining whether the printed product has local expansion, cracks, color penetration, and fading according to the first target image and the second target image;

[0161] Step S203, an adjustment step, in which, when the printed matter has at least one of local expansion, cracks, color penetration and fading, the storage conditions of the printed matter are adjusted to reduce the loss of the printed matter.

[0162] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program for initializing at least the following method steps:

[0163] Step S201, an acquisition step, acquiring a currently acquired image of the printed matter to obtain a first target image, and acquiring a previously acquired image of the printed matter to obtain a second target image;

[0164] Step S202, a determination step, determining whether the printed product has local expansion, cracks, color penetration, and fading according to the first target image and the second target image;

[0165] Step S203, an adjustment step, in which, when the printed matter has at least one of local expansion, cracks, color penetration and fading, the storage conditions of the printed matter are adjusted to reduce the loss of the printed matter.

[0166] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0167] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0168] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0169] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0170] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0171] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0172] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0173] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0174] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0175] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0176] 1) In the storage condition adjustment method of printed matter of the present application, by comparing the currently captured image of the printed matter with the image captured last time, that is, comparing the first target image with the second target image, it is determined whether the printed matter has local expansion, cracks, color penetration and fading, and when at least one of the above-mentioned local expansion, cracks, color penetration and fading occurs in the above-mentioned printed matter, the storage condition of the above-mentioned printed matter is adjusted to reduce the loss of the above-mentioned printed matter and ensure the quality of the printed matter. There is no need for manual judgment to adjust the storage condition, which solves the problem of high workload of manual judgment to adjust the storage condition of printed matter in the prior art.

[0177] 2) In the storage condition adjustment device for printed matter of the present application, by comparing the currently captured image of the printed matter with the image captured last time, that is, comparing the first target image with the second target image, it is determined whether the printed matter has local expansion, cracks, color penetration and fading, and when at least one of the above-mentioned local expansion, cracks, color penetration and fading occurs in the above-mentioned printed matter, the storage condition of the above-mentioned printed matter is adjusted to reduce the loss of the above-mentioned printed matter and ensure the quality of the printed matter. There is no need for manual judgment to adjust the storage conditions, which solves the problem of high workload of manual judgment to adjust the storage conditions of printed matter in the prior art.

[0178] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for adjusting storage conditions of printed matter, characterized in that: include: An acquisition step of acquiring a currently acquired image of the printed product to obtain a first target image, and acquiring a previously acquired image of the printed product to obtain a second target image; A determination step, determining whether the printed product has local expansion, cracks, color penetration, and fading according to the first target image and the second target image; The step of adjusting is to adjust the storage conditions of the printed matter to reduce the loss of the printed matter when at least one of local expansion, cracks, color penetration and fading occurs on the printed matter.

2. The method according to claim 1, characterized in that Determining whether local expansion occurs on the printed product according to the first target image and the second target image includes: Calculating the area of ​​the printed pattern of the printed product according to the first target image to obtain the current printed pattern area; Calculating the area of ​​the printed pattern of the printed product according to the second target image to obtain the area of ​​the last printed pattern; In the case where the ratio of the current printed pattern area to the last printed pattern area is greater than a first predetermined threshold, determining that the printed product has a possibility of expansion, the last printed pattern area being the area of ​​the printed pattern in the last acquired image of the printed product, and the first predetermined threshold is greater than 1; Comparing the outline of the printed pattern of the first target image with the outline of the printed pattern of the second target image to obtain a portion of the first target image where the outline changes; Recognize the shape of the part with the changed contour in the first target image to obtain a recognition result; When the recognition result is a spherical shape, it is determined that the printed matter has partially expanded.

3. The method according to claim 1, characterized in that Determining whether the printed product has cracks according to the first target image and the second target image includes: Calculating the weight of each pixel of the first target image to obtain a plurality of first weights, wherein the weight is a weighted average of the hue, saturation and brightness of the pixel; Calculating the weight of each pixel of the second target image to obtain a plurality of second weights, wherein the second weights correspond one-to-one to the first weights; Calculating the absolute value of the difference between each of the first weights and the corresponding second weight to obtain a plurality of differences, wherein the differences correspond to the pixel points one by one; When the ratio of each difference to the corresponding second weight is greater than a second predetermined threshold, determining the pixel point corresponding to the difference as a first mutation pixel point; Performing curve fitting on the first mutation pixel point to obtain a first fitting line segment; When the length of the first fitting line segment is greater than a predetermined length, it is determined that a crack occurs in the printed product.

4. The method according to claim 3, characterized in that When the length of the first fitting line segment is greater than a predetermined length, determining that a crack occurs in the printed product includes: When the length of the first fitting line segment is greater than the predetermined length and the first fitting line segment is a curve, determining that a crack occurs in the printed product; When the length of the first fitting line segment is greater than the predetermined length and the first fitting line segment is a straight line, it is determined that a printing process defect occurs in the printed product.

5. The method according to claim 1, characterized in that Determining whether color penetration occurs in the printed product according to the first target image and the second target image includes: Calculate the area of ​​the mottled region of the printed pattern of the printed product according to the first target image to obtain the area of ​​the mottled region, where the mottled region is a region where color penetration occurs between regions of different colors; When the ratio of the area of ​​the mottled region to the area of ​​the printed pattern is greater than a third predetermined threshold, determining that the printed product has a mottled phenomenon; In the case where the printed product has a mottled color phenomenon, identifying the boundaries between different colors in the printed pattern of the first target image to obtain a plurality of boundary points; Fitting the plurality of intersection points to obtain a second fitting line segment; When the second fitting line segment is not a straight line, it is determined that color bleeding occurs in the printed product.

6. The method according to claim 1, characterized in that Determining whether the printed product is faded according to the first target image and the second target image includes: Calculate the grayscale value of each pixel point according to the first target image to obtain a plurality of first grayscale values; Calculate the grayscale value of each pixel point according to the second target image to obtain a plurality of second grayscale values, wherein the second grayscale values ​​correspond to the first grayscale values ​​one by one; When the ratio of the first gray value to the corresponding second gray value is less than a fourth predetermined threshold, determining that the pixel point corresponding to the first gray value is a second mutation pixel point, and the fourth predetermined threshold value is less than 1; The area formed by the second mutation pixel points is determined as a faded area, and it is determined that the printed product has faded.

7. The method according to claim 6, characterized in that After determining whether the printed product is faded according to the first target image and the second target image, the method further includes: identifying the boundary of the faded area to obtain a plurality of faded boundaries; determining a faded boundary among the plurality of faded boundaries that is not a boundary of the printed product as a target faded boundary; Determine the fading direction within the target fading boundary as the illumination direction, wherein the fading direction is the direction from large to small of the pixel values ​​of the pixel points within the target fading boundary; Determine the degree of fading according to the average pixel value of all pixels within the target fading boundary; A strategy for adjusting the light intensity in the storage condition is determined according to the light direction and the fading degree.

8. The method according to claim 1, characterized in that In the case where the printed product has at least one of local expansion, cracks, color penetration and fading, adjusting the storage conditions of the printed product to reduce the loss of the printed product, including: In the event that the printed matter experiences local expansion, the humidity of the storage space of the printed matter is lowered; in the event that cracks occur in the printed matter, the humidity of the storage space of the printed matter is increased; in the event that color penetration occurs in the printed matter, the temperature of the storage space of the printed matter is lowered; in the event that the printed matter fades, the light intensity of the faded area of ​​the printed matter is lowered or the position of the faded area of ​​the printed matter is adjusted.

9. The method according to any one of claims 1 to 8, characterized in that After lowering the humidity of the storage space of the printed matter when the printed matter partially expands, raising the humidity of the storage space of the printed matter when cracks appear on the printed matter, lowering the temperature of the storage space of the printed matter when color penetration occurs on the printed matter, and lowering the light intensity of the faded area of ​​the printed matter when fading occurs on the printed matter, the method further includes: The obtaining step, the determining step and the adjusting step are sequentially repeated at least once until the printed product has no local expansion, no cracks, no color penetration and no fading.

10. A device for adjusting storage conditions of printed matter, characterized in that: include: An acquisition unit, configured to execute an acquisition step, acquire a currently acquired image of the printed product to obtain a first target image, and acquire a previously acquired image of the printed product to obtain a second target image; A first determining unit, configured to perform a determining step, and determine whether the printed product has local expansion, cracks, color penetration, and fading according to the first target image and the second target image; The adjusting unit is used to perform an adjusting step to adjust the storage conditions of the printed matter to reduce the loss of the printed matter when at least one of local expansion, cracks, color penetration and fading occurs on the printed matter.

11. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 9 is implemented.

12. A printed matter storage management system, characterized in that: include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of claims 1 to 9.

Images