Printing registration detection method, device and equipment

Abstract

The invention relates to a printing registration detection method, device and equipment. The method comprises the following steps: acquiring a to-be-detected image of a printing plate; wherein the printing plate is made on the basis of a printed electronic file added with at least two mark groups, and the mark groups comprise marks of multiple colors; for each mark group, determining an original distance between a first marker in the to-be-detected image and a standard edge of the printing plate; wherein the first marker is a marker of a main color; determining the position offset of a second marker in the to-be-detected image relative to the first marker in a specified direction; wherein the second markers are markers of other colors except the main color; and detecting the overprinting error according to the original distance and / or the position offset. According to the invention, the problems of inaccurate front and back overprinting during front and back printing, skew printing plate installation and registration detection between colors can be well solved.

Description

Technical Field

[0001] The present disclosure relates to the field of printing technology, and in particular, to a printing registration detection method, apparatus, and device. Background Art

[0002] During printing, the situation of inaccurate overprint often occurs at the printing site. Traditional printing registration detection systems often solve the registration situation between each color pass. The registration detection for each color pass only solves the local registration situation singly. Such a printing registration detection system is relatively one-sided. For example, when the operator installs the plate obliquely during the plate installation process, a large deviation will occur when the detection part of the registration distance is far from the detection area. Now, more and more printing presses have the situation of simultaneous front and back printing. When printing simultaneously on the front and back, the registration situation of the front and back also needs to be detected. Currently, this detection mainly relies on the method of manual measurement with a ruler by workers.

[0003] Therefore, there is a need for a more intelligent registration detection system at present. Summary of the Invention

[0004] To solve the above technical problems, the present disclosure provides a printing registration detection method, apparatus, and device.

[0005] According to one aspect of the present disclosure, there is provided a printing registration detection method, including:

[0006] Obtaining a to-be-detected image of a printing plate; wherein, the printing plate is made based on a printing electronic file added with at least two groups of marker groups, and the marker group includes: marker symbols of multiple colors;

[0007] For each of the marker groups, determining an original distance between a first marker symbol in the to-be-detected image and a standard edge of the printing plate; wherein, the first marker symbol is a marker symbol of a main color;

[0008] Determining a position offset of a second marker symbol relative to the first marker symbol in a specified direction in the to-be-detected image; wherein, the second marker symbol is a marker symbol of a color other than the main color;

[0009] Detecting overprint error according to the original distance and / or the position offset.

[0010] According to another aspect of the present disclosure, there is also provided a printing registration detection device, including:

[0011] An image acquisition module, configured to obtain a to-be-detected image of a printing plate; wherein, the printing plate is made based on a printing electronic file added with at least two groups of marker groups, and the marker group includes: marker symbols of multiple colors;

[0012] The first detection module is configured to determine the original distance between the first identifier and the standard edge of the printing plate in the to-be-detected image for each of the marker groups; wherein, the first identifier is the identifier of the main color.

[0013] The second detection module is configured to determine the position offset of the second identifier relative to the first identifier in a specified direction in the to-be-detected image; wherein, the second identifier is the identifier of a color other than the main color.

[0014] The overprint error detection module is configured to detect the overprint error according to the original distance and / or the position offset.

[0015] According to another aspect of the present disclosure, there is also provided an electronic device, which includes:

[0016] A processor;

[0017] A memory for storing executable instructions executable by the processor;

[0018] The processor is configured to read the executable instructions from the memory and execute the instructions to implement the above method.

[0019] According to another aspect of the present disclosure, there is also provided a computer-readable storage medium, which stores a computer program for executing the above method.

[0020] The technical solution provided by the embodiments of the present disclosure has the following advantages compared with the prior art:

[0021] The technical solution provided by the embodiments of the present disclosure includes: obtaining a to-be-detected image of a printing plate; wherein, the printing plate is made based on a printed electronic file with at least two groups of marker groups added, and the marker groups include: identifiers of multiple colors; for each marker group, determining the original distance between the first identifier and the standard edge of the printing plate in the to-be-detected image; wherein, the first identifier is the identifier of the main color; determining the position offset of the second identifier relative to the first identifier in a specified direction in the to-be-detected image; wherein, the second identifier is the identifier of a color other than the main color; detecting the overprint error according to the original distance and / or the position offset.

[0022] This technical solution has strong compatibility with paper sizes, is simple to operate, and has stronger usability. It does not require additional personnel operations, can be compatible with overprint problems in single-sided printing and double-sided printing, can better solve the problem of inaccurate front-back overprinting during front-back printing, solve the problem of inclined plate installation during printing, and guide operators to handle the problems. In addition, it can also better solve the problem of registration detection between different color passes. Description of the Drawings

[0023] The accompanying drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0024] To more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a flowchart of the printing registration detection method according to the embodiment of the present disclosure;

[0026] Figure 2 It is a schematic diagram of the marker group according to the embodiment of the present disclosure;

[0027] Figure 3 It is a schematic diagram of a printed electronic document with two sets of marker groups added according to the embodiment of the present disclosure;

[0028] Figure 4 It is a schematic structural diagram of the printing registration detection device according to the embodiment of the present disclosure;

[0029] Figure 5 It is a schematic structural diagram of the electronic device according to the embodiment of the present disclosure. Detailed implementation manners

[0030] In order to be able to more clearly understand the above objects, features, and advantages of the present disclosure, the following will further describe the solutions of the present disclosure. It should be noted that, without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

[0031] Many specific details are set forth in the following description to facilitate a thorough understanding of the present disclosure, but the present disclosure can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the present disclosure, rather than all embodiments.

[0032] Figure 1 As shown in the flowchart of a printing registration detection method provided for the embodiment of the present disclosure, this method can be applicable to the case of overprint detection at the printing site. This printing registration detection method can be executed by a printing registration detection device, and this device can be implemented by software and / or hardware. As Figure 1 shown, a printing registration detection method can include the following steps.

[0033] S102, obtaining a to-be-detected image of a printing plate; wherein, the printing plate is made based on a printed electronic document with at least two sets of marker groups added, and the marker group includes: marker symbols of multiple colors.

[0034] It is easy to understand that the working principle of a printing press is as follows: the printed electronic documents such as the text and images to be printed are made into printing plates, the printing plates are installed on the printing press, the ink is applied to the printing areas on the printing plates manually or by the printing press, and then it is directly or indirectly transferred to paper or other printing substrates (such as textiles, metal plates, plastics, leathers, wood boards, glasses, and ceramics), so as to reproduce the same printed matter as the printing plate.

[0035] The printing plate in this embodiment is made based on a printed electronic document added with at least two groups of markers. Refer to Figure 2 As shown in a schematic diagram of a group of markers, the group of markers may include: markers of various colors, such as crosshairs, but not limited to markers in the form of crosshairs.

[0036] In one embodiment, as Figure 3 shown, the group of markers is added at the key positions on the left and right sides of the printed electronic document; the length of the group of markers is determined based on the number of color groups of the printed electronic document, and the length of the group of markers does not exceed a preset length threshold.

[0037] In a specific example, the markers of the main color (such as black) are used as the standard for the group of markers, and the markers of other various colors are overprinted on the markers of the main color, or in other words, each color is overprinted on black. On the printed electronic document before making the printing plate, at least two groups of markers as Figure 2 shown are added. The adding positions of the group of markers are generally at the key positions on the left and right sides of the printing plate, such as Figure 3 the upper left corner and the upper right corner shown by the oval dotted line in . Usually during printing, the printing plate (such as paper) is 5 - 20 mm larger than the printed graphic area of the printed electronic document, the width of the group of markers is a preset value, such as 3 mm wide, and the length of the group of markers can be determined according to the number of color groups of the printed electronic document, generally not exceeding a preset length threshold (such as 50 mm). Of course, the above values are only examples and are not limited to this in actual applications.

[0038] After adding the group of markers to the printed electronic document, a printing plate is made based on the printed electronic document added with the group of markers. When making the printing plate, the markers of each color in the group of markers are split into the printing plates of each color sequence. For example, the black crosshairs are split into the black printing plate, and the red crosshairs are split into the red printing plate, that is, the crosshairs of each color are split into the printing plates of their respective colors.

[0039] To achieve registration detection, in this embodiment, an image acquisition device can be used to acquire the image to be detected of the above printing plate. Since more and more printing presses perform simultaneous front and back printing, based on this, in this embodiment, the image to be detected of the printing plate can be acquired from the front and the back respectively. In this way, the image to be detected can include the front image and the back image of the printing plate. Then, registration detection is performed based on the image to be detected.

[0040] S104. For each marker group, determine the original distance between the first marker in the image to be detected and the standard edge of the printing plate; wherein, the first marker is a marker of the main color, specifically a black crosshair.

[0041] In this embodiment, one of the edges of the printing plate can be preset as the standard edge, and the original distance between each first marker in each marker group and the standard edge is calculated. It can be understood that in the case of zero error, the distance between the first marker and the standard edge is fixed. However, in actual scenarios, image acquisition and paper jitter and other situations will cause overprint errors. Therefore, the offset of the first marker can be detected according to the actually detected original distance between the first marker and the standard edge of the printing plate, and then the overprint situation can be detected based on this offset.

[0042] S106. Determine the position offset of the second marker relative to the first marker in the specified direction in the image to be detected; wherein, the second marker is a marker of a color other than the main color. The above specified direction generally includes the X-axis direction and the Y-axis direction.

[0043] S108. Detect the overprint error according to the original distance and / or the position offset.

[0044] In this embodiment, the overprint situation of the front and back can be detected for anomalies according to the original distance, and / or the overprint skew situation can be detected for anomalies according to the position offset.

[0045] For a better understanding of the solution, the following will elaborate on steps S104 - S108 in detail.

[0046] In this embodiment, the image to be detected includes the front image and the back image; the process of determining the original distance between the first marker in the image to be detected and the standard edge of the printing plate can be referred to as follows.

[0047] Among the multiple first markers in the front image, determine the front marker corresponding to the preset standard edge of the printing plate; among the multiple first markers in the back image, determine the back marker corresponding to the standard edge.

[0048] Specifically, the front and back sides can be calculated separately, and the IPU (Intelligent Processing Unit) is used to transmit the data in ToBlackDistance in the data packet. First, the identifiers participating in the calculation are determined according to the preset standard edge. In the front image and the back image, each identifier in the identifier group is numbered in the order from top to bottom and from left to right. Taking the X-axis direction as an example, the standard edge is generally the left or the right side. Suppose the left side of the front is the standard edge, then the first first identifier in the front image and the second first identifier in the back image participate in the calculation, that is, the first first identifier in the above-mentioned front image is determined as the front identifier corresponding to the standard edge, and the second first identifier in the above-mentioned back image is determined as the back identifier corresponding to the standard edge. Similarly, suppose in another case that the right side of the front is the standard edge, then the second first identifier in the above-mentioned front image is determined as the front identifier corresponding to the standard edge, and the first first identifier in the above-mentioned back image is determined as the back identifier corresponding to the standard edge.

[0049] Detect the distance between the front identifier and the standard edge in the front image to obtain the first distance.

[0050] Specifically, detect the position coordinate of the front identifier in the X-axis direction in the front image, denoted as X(Black_1), and detect the position coordinate of the standard edge in the X-axis direction in the front image, denoted as X(Edge); then, referring to the following formula, the first distance between the front identifier and the standard edge in the X-axis direction can be determined according to the position coordinates X(Black_1) and X(Edge):

[0051] ΔStdX_F = X(Black_1) - X(Edge)

[0052] Among them, ΔStdX_F represents the first distance between the front identifier and the standard edge in the X-axis direction, and this front identifier is the first first identifier in the front image.

[0053] Detect the distance between the back identifier and the standard edge in the back image to obtain the second distance.

[0054] Specifically, detect the position coordinate of the back identifier in the X-axis direction in the back image, denoted as X(Black_2), and detect the position coordinate of the standard edge in the X-axis direction in the back image, denoted as X(Edge); then, referring to the following formula, the second distance between the front identifier and the standard edge can be determined according to the position coordinates X(Black_2) and X(Edge):

[0055] ΔStdX_B = X(Edge) - X(Black_2)

[0056] Wherein, ΔStdX_B represents the second distance between the back marker and the standard edge in the X-axis direction, and the back marker is the second first marker in the back image.

[0057] Take the first distance and the second distance as the original distance between the first marker and the standard edge.

[0058] Based on the above embodiments, detecting the overprinting error according to the original distance may include:

[0059] Determine the difference distance between the first distance ΔStdX_F and the second distance ΔStdX_B, that is: ΔStdX_F - ΔStdX_B; determine the average value between the difference distances corresponding to multiple marker groups (that is: Σ(ΔStdX_F - ΔStdX_B)) as the front-back overprinting error value, and the front-back overprinting error value refers to the error value between the front overprinting and the back overprinting in the X-axis direction; in the case where the front-back overprinting error value is greater than the preset first error threshold, determine that the front-back overprinting detection is abnormal.

[0060] Specifically, referring to the following formula, determine the difference between the difference distances corresponding to multiple marker groups as the front-back overprinting error value:

[0061] ΔStdX_FB = Σ(ΔStdX_F - ΔStdX_B)

[0062] Based on the above formula, taking one marker group as an example, the front-back overprinting error value can be understood as: the difference obtained by subtracting the second distance of the second first marker on the back in the X-axis direction from the first distance of the first first marker on the front in the X-axis direction, to obtain the front-back overprinting error value in the X-axis direction.

[0063] Based on the above embodiments, this embodiment can compare the front-back overprinting error value with the preset first error threshold, and in the case where the front-back overprinting error value is greater than the first error threshold, determine that the front-back overprinting detection is abnormal. And, according to the positive or negative of the front-back overprinting error value, or according to the comparison of the magnitudes of the first distance and the second distance, the position offset situation of the front overprinting and the back overprinting can be determined, such as the situation where the front shifts to the left, etc.

[0064] During actual display, the front-back overprinting error value can be converted into data display in millimeters (mm), and direction adjustment suggestion information can be given by an arrow according to the position offset situation.

[0065] It can be understood that the above embodiments describe the detection process of the front-back overprinting error value from the X-axis direction. Similarly, the following embodiments will describe the detection process of the front-back overprinting error value from the Y-axis direction.

[0066] Step 1: Among multiple first markers in the front image, determine the front marker corresponding to the preset standard edge of the printing plate; among multiple first markers in the back image, determine the back marker corresponding to the standard edge.

[0067] In the Y-axis direction, the standard edge is generally the upper edge or the lower edge. Assume that the upper edge of the front is the standard edge, then the first first marker in the front image and the second first marker in the back image are involved in the calculation, that is, the first first marker in the front image is determined as the front marker corresponding to the standard edge, and the second first marker in the back image is determined as the back marker corresponding to the standard edge. Similarly, assume another case where the lower edge of the front is the standard edge, then the second first marker in the front image is determined as the front marker corresponding to the standard edge, and the first first marker in the back image is determined as the back marker corresponding to the standard edge.

[0068] Step 2: Detect the distance between the front marker and the standard edge in the front image to obtain the first distance.

[0069] Specifically, detect the position coordinate of the front marker in the front image in the Y-axis direction, denoted as Y(Black_1), and detect the position coordinate of the standard edge in the front image in the Y-axis direction, denoted as Y(Edge); then, referring to the following formula, based on the position coordinate Y(Black_1) and the position coordinate Y(Edge), the first distance between the front marker and the standard edge in the Y-axis direction can be determined:

[0070] ΔStdY_F = Y(Black_1) - Y(Edge)

[0071] Where, ΔStdY_F represents the first distance between the front marker and the standard edge in the Y-axis direction, and this front marker is the first first marker in the front image.

[0072] Step 3: Detect the distance between the back marker and the standard edge in the back image to obtain the second distance.

[0073] Specifically, detect the position coordinate of the back marker in the back image in the Y-axis direction, denoted as Y(Black_2), and detect the position coordinate of the standard edge in the back image in the Y-axis direction, denoted as Y(Edge); then, referring to the following formula, based on the position coordinate Y(Black_2) and the position coordinate Y(Edge), the second distance between the front marker and the standard edge can be determined:

[0074] ΔStdY_B = Y(Edge) - Y(Black_2)

[0075] Among them, ΔStdY_B represents the second distance between the back marker and the standard edge in the Y-axis direction, and the back marker is the second first marker in the back image.

[0076] Take the first distance and the second distance as the original distance between the first marker and the standard edge.

[0077] Based on the above embodiments, detecting the overprinting error according to the original distance may include the following step 4.

[0078] Step 4, determine the difference distance between the first distance ΔStdY_F and the second distance ΔStdY_B, that is: ΔStdY_F - ΔStdY_B; determine the average value of the difference distances corresponding to multiple marker groups (that is: Σ(ΔStdY_F - ΔStdY_B)) as the front-back overprinting error value, and the front-back overprinting error value refers to the error value between the front overprinting and the back overprinting in the Y-axis direction; in the case where the front-back overprinting error value is greater than the preset first error threshold, determine that the front-back overprinting detection is abnormal.

[0079] Specifically, referring to the following formula, determine the sum of the difference distances corresponding to multiple marker groups as the front-back overprinting error value:

[0080] ΔStdY_FB = Σ(ΔStdY_F - ΔStdY_B)

[0081] Based on the above formula, taking one marker group as an example, the front-back overprinting error value can be understood as: the difference obtained by subtracting the second distance of the second first marker on the back in the Y-axis direction from the first distance of the first first marker on the front in the Y-axis direction, to obtain the front-back Y-axis direction overprinting error value.

[0082] Based on the above embodiments, this embodiment can compare the front-back overprinting error value with the preset first error threshold, and in the case where the front-back overprinting error value is greater than the first error threshold, determine that the front-back overprinting detection is abnormal. And, according to the positive or negative of the front-back overprinting error value, or according to the comparison of the magnitudes of the first distance and the second distance, the position offset situation of the front overprinting and the back overprinting can be determined, such as the situation of the front offset upward, etc.

[0083] During actual display, the front-back overprinting error value can be converted into data display in millimeters (mm), and direction adjustment suggestion information can be given by an arrow according to the position offset situation.

[0084] Based on the above embodiments, by detecting the first distance and the second distance between multiple black first markers and a standard edge, it is possible to detect the front-back overprinting situation, correct the image, avoid or reduce data errors caused by image acquisition and paper jitter, and visually display the front-back overprinting error value and the result of abnormal front-back overprinting detection, improving the intuitiveness of overprinting detection.

[0085] In an embodiment of skew detection, the skew situation can be calculated according to the marker groups on both sides of the printed electronic document by calculating the numerical offset in the longitudinal direction of the same printing color. Specifically, each marker group can be calculated separately.

[0086] During the process of calculating the Y coordinate offset value, the coordinate of the blue marker of the first marker group on the front side on the X axis is FY1(blue), and the coordinate of the blue marker of the second marker group on the front side on the Y axis is FY2(blue); thus, the Y coordinate offset value of the blue marker on the Y axis is calculated as: FYP(Blue) = FY1(blue) - FY2(blue). Compare the Y coordinate offset value with the preset longitudinal offset threshold of the skew plate. In the case where the Y coordinate offset value is greater than the longitudinal offset threshold of the skew plate, it is determined that the longitudinal skew detection of overprinting is abnormal.

[0087] The above is only an exemplary description of the skew detection method for the blue plate taking blue as an example. The skew detection methods for other printing colors such as red and yellow are the same.

[0088] In this embodiment, regarding the detection situation between the overprintings of each printing color described in step S106, the specified direction may include, for example, the X-axis direction and the Y-axis direction; correspondingly, determining the position offset of the second marker relative to the first marker in the specified direction in the image to be detected may specifically include the following content.

[0089] (1) On the image to be detected, detect the horizontal distance between the first marker and the second marker in the X-axis direction and the vertical distance in the Y-axis direction.

[0090] In a specific embodiment, the front and back are calculated separately, and the data in ToBlackDistance in the IPU transmission data packet is used. According to the marker groups on both sides of the printed electronic document, calculate the numerical offsets in the horizontal and vertical directions of the same color. Specifically, taking the second marker of a color such as red, yellow, or blue as an example, for each second marker of each color, calculate the distance of the second marker relative to the first marker of the main color (black). The position offset includes the horizontal distance in the X-axis direction and the vertical distance in the Y-axis direction.

[0091] (2) Determine the difference between the horizontal distance and the preset horizontal standard distance as the horizontal position offset of the second marker relative to the first marker in the X-axis direction.

[0092] (3) Determine the difference between the vertical distance and the preset vertical standard distance as the vertical position offset of the second marker relative to the first marker in the Y-axis direction.

[0093] In this embodiment, it is necessary to preset the horizontal standard distance of each color of the marker group relative to the main color in the X-axis and the vertical standard distance in the Y-axis; the above standard distance can be the number of pixels per unit or the resolution automatically set in advance by the detection program, which is not limited here.

[0094] Based on this, determine the difference between the horizontal distance and the preset horizontal standard distance as the horizontal position offset of the second marker of the current color relative to the first marker of the main color in the X-axis direction. This horizontal position offset represents the offset situation between the current color and the main color in the X-axis direction. Taking the second marker of blue as an example, the horizontal distance between the second marker of blue and the first marker in the X-axis direction is represented as X (BlueToBlack) , and the preset horizontal standard distance is represented as X (BlueToBlack标准值) . Therefore, the horizontal position offset of blue relative to the main color is:

[0095] ΔX_Blue = X (BlueToBlack) - X (BlueToBlack标准值) .

[0096] Similarly, determine the difference between the vertical distance and the preset vertical standard distance as the vertical position offset of the second marker of the current color relative to the first marker of the main color in the Y-axis direction. This vertical position offset represents the offset situation between the current color and the main color in the Y-axis direction. The horizontal distance between the second marker of blue and the first marker in the Y-axis direction is represented as Y (BlueToBlack) , and the preset vertical standard distance is represented as Y (BlueToBlack标准值) . Therefore, the vertical position offset of blue relative to the main color is:

[0097] ΔY_Blue = Y (BlueToBlack) - Y (BlueToBlack标准值) .

[0098] Referring to the above embodiments, the horizontal position offset in the X-axis direction and the vertical position offset in the Y-axis direction between each color sequence can be calculated. Based on this, the detection situation between the overprints of each color sequence can be determined.

[0099] The detection results of the above-mentioned horizontal position offset and vertical position offset are, for example, 0.1 mm. The above-mentioned position offset is visually displayed to the user for the detection situation between overprints of each color sub-layer and for the overprint adjustment of the printing plate.

[0100] Based on the above embodiments, detecting the overprint error according to the position offset may include:

[0101] First, determine the average value between the horizontal position offsets corresponding to multiple marker groups as the horizontal overprint error value; determine the average value between the vertical position offsets corresponding to multiple marker groups as the vertical overprint error value.

[0102] In this embodiment, the average value of the horizontal position offsets of two groups of marker groups in the same row of each color sub-layer in the X-axis direction can be calculated, and then the horizontal overprint error value can be determined; and, the average value of the vertical position offsets of two groups of marker groups in the same column of each color sub-layer in the Y-axis direction can be calculated, and then the vertical overprint error value can be determined.

[0103] Taking the vertical overprint error value of two marker groups as an example, the vertical overprint error value can refer to the following formula:

[0104] ΔY_error = [BlueToBlack standard value + ΔY_Blue] / 2.

[0105] Then, when the horizontal overprint error value is greater than a preset second error threshold, it is determined that the detection of the horizontal overprint bevel is abnormal; when the vertical overprint error value is greater than a preset third error threshold, it is determined that the detection of the vertical overprint bevel is abnormal.

[0106] The horizontal overprint error value and the vertical overprint error value in the above embodiments, as well as the result of the detection of the abnormal vertical overprint bevel, can be visually displayed to the user, which can more intuitively reflect the overprint displacement situation of blue relative to the main color (black). A negative number indicates that blue moves to the left of black, and a positive number indicates that blue moves to the right of black. This relative movement direction can also be represented by the arrow direction. This representation method using arrows can enhance the display effect and play a role in reminding the user.

[0107] It can be understood that the above only takes blue as an example, and the bevel detection situation of the second marker of other colors (such as red, yellow, green, etc.) is exactly the same as that in the above embodiments.

[0108] In one embodiment, the printing registration detection method may further include: when it is determined that the detection of the horizontal overprint bevel is abnormal and / or the detection of the vertical overprint bevel is abnormal, adjusting the direction of the printing plate corresponding to the color of the second marker.

[0109] After detecting the overprint error according to the original distance and / or position offset, the printing registration detection method provided in this embodiment further includes: when the overprint error detection is abnormal, generating an alarm message.

[0110] Based on the above embodiments, in a printing scenario, after the printing operator installs the printing plate, proofing starts, and the detection system starts to work. At the same time, it detects the overprint situation of multiple colors, the situation of the installed plate being skewed, and the overprint situation of the front and back sides. According to the detection results, the overprint data in various situations can be displayed. At the same time, it supports the automatic adjustment of the printing plates of each color group. When it exceeds the adjustment range, an alarm can be given and manual intervention can be carried out for adjustment. This can assist the operator to quickly complete the proofing work, reduce the proofing time, reduce the entire printing time, and improve production efficiency. At the same time, resource consumption (such as ink, paper, etc.) can be reduced during the proofing process, helping the enterprise to achieve cost reduction and efficiency improvement.

[0111] In summary, the printing registration detection method provided in this embodiment takes more comprehensive overprint detection into account compared to traditional overprinting. This technical solution has strong compatibility with the paper size, is simple to operate, and has better usability. It does not require additional personnel operation, can be compatible with the overprint problems in single-sided printing and double-sided printing, can better solve the problem of inaccurate front-back overprinting during front-back printing, solve the problem of the installed printing plate being skewed, and guide the operator to handle the problems. Moreover, it can also better solve the overprint detection situation between different print runs.

[0112] Figure 4 The following is a schematic structural diagram of a printing registration detection device provided by an embodiment of the present disclosure. The device may include the following modules.

[0113] An image acquisition module 210, configured to acquire a to-be-detected image of a printing plate; wherein, the printing plate is made based on a printing electronic file added with at least two groups of marker groups, and the marker groups include: marker symbols of multiple colors;

[0114] A first detection module 220, configured to determine, for each of the marker groups, an original distance between a first marker symbol in the to-be-detected image and a standard edge of the printing plate; wherein, the first marker symbol is a marker symbol of the main color;

[0115] A second detection module 230, configured to determine a position offset of a second marker symbol relative to the first marker symbol in a specified direction in the to-be-detected image; wherein, the second marker symbol is a marker symbol of a color other than the main color;

[0116] An overprint error detection module 240, configured to detect an overprint error according to the original distance and / or the position offset.

[0117] The device provided in this embodiment has the same implementation principle and technical effects as the foregoing method embodiment. For a brief description, for parts not mentioned in the device embodiment, reference may be made to the corresponding content in the foregoing method embodiment.

[0118] Figure 5 FIG. is a schematic structural diagram of an electronic device provided by an embodiment of the present disclosure. As Figure 5 shown, the electronic device 400 includes one or more processors 401 and a memory 402.

[0119] The processor 401 may be a central processing unit (CPU) or other forms of processing units with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 400 to perform desired functions.

[0120] The memory 402 may include one or more computer program products, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 401 may run the program instructions to implement the printing registration detection method of the embodiment of the present disclosure described above and / or other desired functions. Various contents such as input signals, signal components, noise components, etc. may also be stored in the computer-readable storage medium.

[0121] In one example, the electronic device 400 may further include: an input device 403 and an output device 404, and these components are interconnected through a bus system and / or other forms of connection mechanisms (not shown).

[0122] In addition, the input device 403 may further include, for example, a keyboard, a mouse, etc.

[0123] The output device 404 may output various information to the outside, including the determined distance information, direction information, etc. The output device 404 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0124] Of course, for simplicity, Figure 5 only some of the components related to the present disclosure in the electronic device 400 are shown, and components such as buses, input / output interfaces, etc. are omitted. In addition, according to specific application scenarios, the electronic device 400 may further include any other appropriate components.

[0125] Further, this embodiment also provides a computer-readable storage medium storing a computer program for executing the above printing registration detection method.

[0126] A computer program product of a printing registration detection method, apparatus, electronic device, and medium provided by an embodiment of the present disclosure includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the method described in the foregoing method embodiments. For specific implementation, reference can be made to the method embodiments and will not be elaborated herein.

[0127] It should be noted that, in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0128] The above are only specific embodiments of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but rather will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A printing registration detection method, characterized in that: include: Acquire an image to be detected of a printed plate; wherein the printed plate is made based on a printed electronic file to which at least two groups of marking groups are added, and the marking groups include: marking symbols of multiple colors; For each of the marking groups, determining the original distance between the first marking symbol in the image to be detected and the standard edge of the printing plate; wherein the first marking symbol is a marking symbol of a main color; Determine a position offset of a second marker in the image to be detected relative to the first marker in a specified direction; wherein the second marker is a marker of a color other than the main color; The overprint error is detected according to the original distance and / or the position offset.

2. The method according to claim 1, characterized in that The image to be detected includes a front image and a back image; and determining the original distance between the first marker in the image to be detected and the standard edge of the printing plate includes: Determine, among a plurality of first markers in the front image, a front marker corresponding to a preset standard edge of the printing plate; Determine a back side marker corresponding to the standard edge among the plurality of first markers in the back side image; Detecting the distance between the front marker and the standard edge in the front image to obtain a first distance; Detecting the distance between the back side marker and the standard edge in the back side image to obtain a second distance; The first distance and the second distance are used as original distances between the first marker and the standard edge.

3. The method according to claim 2, characterized in that Detecting the overprint error according to the original distance includes: determining a difference distance between the first distance and the second distance; Determine the average value of the difference distances corresponding to the plurality of mark groups as the front and back overprint error value; When the front and back side overprint error value is greater than a preset first error threshold, it is determined that the front and back side overprint detection is abnormal.

4. The method according to claim 1, characterized in that: The specified direction includes: an X-axis direction and a Y-axis direction; and determining the position offset of the second marker in the image to be detected relative to the first marker in the specified direction includes: On the image to be detected, detecting a horizontal distance between the first marker and the second marker in the X-axis direction and a vertical distance between the first marker and the second marker in the Y-axis direction; Determine the difference between the horizontal distance and the preset horizontal standard distance as the horizontal position offset of the second marker relative to the first marker in the X-axis direction; The difference between the longitudinal distance and the preset longitudinal standard distance is determined as the longitudinal position offset of the second marker relative to the first marker in the Y-axis direction.

5. The method according to claim 4, characterized in that Detecting the overprint error according to the position offset includes: Determine the average value of the lateral position offsets corresponding to the plurality of mark groups as a lateral overprint error value; Determine the average value of the longitudinal position offsets corresponding to the plurality of mark groups as the longitudinal overprint error value; In the case where the lateral overprint error value is greater than a preset second error threshold, determining that the overprint lateral inclined plate detection is abnormal; When the longitudinal overprint error value is greater than a preset third error threshold, it is determined that the overprint longitudinal inclined plate detection is abnormal.

6. The method according to claim 5, characterized in that The method further comprises: When it is determined that the detection of the overprinting transverse inclined plate is abnormal and / or the detection of the overprinting longitudinal inclined plate is abnormal, the direction of the printing plate corresponding to the color of the second marker is adjusted.

7. The method according to claim 1, characterized in that After detecting the overprint error according to the original distance and / or the position offset, the method further includes: When an abnormality occurs in the overprint error detection, an alarm message is generated.

8. The method according to claim 1, characterized in that The mark group is added at key positions on the left and right sides of the printed electronic file; the length of the mark group is determined based on the number of color groups of the printed electronic file, and the length of the mark group does not exceed a preset length threshold.

9. A printing registration detection device, characterized in that: include: An image acquisition module is used to acquire an image to be detected of a printing plate; wherein the printing plate is made based on a printed electronic file with at least two groups of marking groups added thereto, the marking groups comprising: marking symbols of multiple colors; A first detection module, for determining, for each of the mark groups, an original distance between a first marker in the image to be detected and a standard edge of the printing plate; wherein the first marker is a marker of a primary color; A second detection module, used to determine the position offset of a second marker in the image to be detected relative to the first marker in a specified direction; wherein the second marker is a marker of a color other than the main color; The overprint error detection module is used to detect the overprint error according to the original distance and / or the position offset.

10. An electronic device, characterized in that: The electronic device comprises: processor; a memory for storing instructions executable by the processor; The processor is used to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1 to 7.

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