Printing ink transfer performance optimization method based on offset printing pressure

Abstract

The invention relates to the technical field of offset printing, and discloses an offset printing pressure-based ink transfer performance optimization method, which comprises the following steps of: acquiring an offset printing environment, acquiring ink characteristics, initializing an ink supply mechanism, an ink distributing mechanism and a monitoring unit according to ink and the ink characteristics, real-time ink distributing data of the initialized ink distributing mechanism are monitored in real time based on the initialized monitoring unit, thinned ink is obtained after it is confirmed that the ink distributing mechanism completes the ink distributing task based on the real-time ink distributing data, the thinned ink and the inking mechanism are used for executing offset printing operation on the offset printing carrier, and the offset printing operation is monitored in real time, so that the offset printing efficiency is improved. And obtaining real-time offset printing data until the completion of the pre-constructed inking task is confirmed, obtaining an offset printing product, and completing the ink transfer performance optimization based on the offset printing pressure. The main purpose of the invention is to fuse a plurality of parameters to perform real-time monitoring and feedback adjustment on the offset printing process on the premise of ensuring the ink transfer performance, and to perform quality inspection on offset printing products in real time so as to reduce material loss.

Description

Technical Field

[0001] The present invention relates to a method for optimizing ink transfer performance based on offset printing pressure, belonging to the field of offset printing technology. Background Art

[0002] In the field of offset printing, the optimization of ink transfer performance is the key to improving printing quality, reducing waste and lowering costs. The ink transfer performance is related to the ink viscosity, and the ink viscosity is related to multiple parameters such as offset printing pressure, ambient temperature, and ambient humidity. Therefore, how to optimize the ink transfer performance is the key to the development of the offset printing field.

[0003] Currently, the offset printing pressure can be monitored in real time through a pressure sensor and fed back to the control system to ensure the ink transfer rate.

[0004] Although the above materials can ensure the ink transfer performance during the offset printing process, the ink transfer rate is related to multiple parameters in addition to the offset printing pressure. At the same time, when problems occur during the offset printing process, the quality inspection of the offset printing products is still carried out after the offset printing is completed. Therefore, it is necessary to fuse multiple parameters to monitor and feedback-adjust the offset printing process in real time and perform quality inspection on the offset printing products in real time to reduce material loss on the premise of ensuring the ink transfer performance. Summary of the Invention

[0005] The present invention provides a method, device and computer-readable storage medium for optimizing ink transfer performance based on offset printing pressure, and its main purpose is to fuse multiple parameters to monitor and feedback-adjust the offset printing process in real time and perform quality inspection on the offset printing products in real time to reduce material loss on the premise of ensuring the ink transfer performance.

[0006] To achieve the above object, a method for optimizing ink transfer performance based on offset printing pressure provided by the present invention includes:

[0007] Receiving a printing monitoring instruction, and obtaining the offset printing environment according to the printing monitoring instruction, wherein the offset printing environment includes: an ink supply mechanism, an ink distribution mechanism, an inking mechanism, a cooling mechanism, a monitoring unit and a feedback control unit;

[0008] Obtaining ink and ink characteristics based on the ink supply mechanism, and initializing the ink supply mechanism, the ink distribution mechanism and the monitoring unit according to the ink and ink characteristics, wherein the ink characteristics include: ink type, ink viscosity, suitable temperature range, suitable humidity range, and suitable pressure range;

[0009] Based on the initialized monitoring unit, the real-time ink distribution data of the initialized ink distribution mechanism is monitored in real time. After it is confirmed based on the real-time ink distribution data that the ink distribution mechanism has completed the pre-constructed ink distribution task, thinned ink is obtained;

[0010] Perform offset printing operations on a pre-constructed offset printing carrier using thinning ink and an inking mechanism, and obtain real-time offset printing data by monitoring the offset printing operations in real time. Among them, the real-time offset printing data includes: real-time monitoring images and multiple real-time offset printing pressures;

[0011] Until it is confirmed based on the real-time offset printing data that the inking mechanism has completed the pre-constructed inking task, an offset printing product is obtained, and the ink transfer performance optimization based on the offset printing pressure is completed.

[0012] Optionally, the obtaining of the offset printing environment according to the printing monitoring instruction includes:

[0013] Obtain the parameters of the ink distributing elements. Among them, the ink distributing mechanism includes: a single ink roller, an ink distributing roller, and a heavy roller;

[0014] After confirming that the parameters of the ink distributing elements are in the preset normal ink distributing element state, obtain the parameters of the cooling elements. Among them, the cooling mechanism includes: obtaining a first water pump, a heat exchanger, a cooling water tank, a second water pump, and cooling water pipes. Connect the first water pump, the heat exchanger, the cooling water tank, and the second water pump in series in turn to obtain a cooling source. Pass the single ink roller, the ink distributing roller, and the heavy roller through a cooling water pipe respectively, and connect the single ink roller, the ink distributing roller, and the heavy roller after passing through the cooling water pipe in parallel to obtain a cooled ink distributing member. Connect the cooled ink distributing member and the cooling source in series;

[0015] After confirming that the parameters of the cooling elements are in the preset normal cooling element state, confirm the offset printing environment based on the ink distributing mechanism and the cooling mechanism.

[0016] Optionally, the real-time ink distribution data of the initialized ink distributing mechanism monitored in real time based on the initialized monitoring unit includes:

[0017] Judge in real time whether the real-time ink distribution data is preset controllable data according to a preset frequency;

[0018] If the real-time ink distribution data is controllable data, generate an adjustment signal based on the real-time ink distribution data and the feedback control unit, and perform a real-time feedback adjustment operation on the initialized ink distributing mechanism using the adjustment signal to obtain an adjusted ink distributing mechanism. Take the adjusted ink distributing mechanism as the initialized ink distributing mechanism, and return to the step of judging in real time whether the real-time ink distribution data is preset controllable data according to the preset frequency;

[0019] If the real-time ink distribution data is not controllable data, immediately stop the initialized ink distributing mechanism, and return to the step of obtaining ink and ink characteristics based on the ink supply mechanism.

[0020] Optionally, the pre-constructed ink distribution task includes:

[0021] Pre-cool the ink distributing mechanism using the cooling mechanism;

[0022] When the ink distribution mechanism after pre-cooling is confirmed to be in a preset cooling state by the initialized monitoring unit, an available ink distribution mechanism is obtained, and ink is transported to the available ink distribution mechanism according to the initialized ink supply mechanism to obtain ink to be distributed;

[0023] The available ink distribution mechanism receiving the ink is cooled in real time by a cooling mechanism, and after the ink to be distributed is leveled and thinned according to the preset ink distribution parameters and the available ink distribution mechanism, thinned ink is obtained, and the pre-constructed ink distribution task is confirmed based on the thinned ink.

[0024] Optionally, obtaining the ink and ink characteristics based on the ink supply mechanism includes:

[0025] Using a pre-constructed database to query the historical ink viscosity data corresponding to the ink type, where the historical ink viscosity data is as follows:

[0026] N i = i , M i

[0027] where N i represents the i-th ink viscosity in the historical ink viscosity data, T i represents the i-th ink temperature in the historical ink viscosity data, and M i represents the i-th ambient humidity in the historical ink viscosity data;

[0028] Drawing a temperature-humidity-viscosity characteristic space distribution diagram based on the historical ink viscosity data, where the x-axis in the temperature-humidity-viscosity characteristic space distribution diagram is the ink temperature, the y-axis is the ambient humidity, and the z-axis is the ink viscosity;

[0029] Obtaining historical offset printing data, where the historical offset printing data includes: multiple offset printing viscosities, multiple offset printing speeds, multiple offset printing pressures, and multiple ink transfer rates;

[0030] Drawing multiple speed-pressure-transfer rate characteristic space distribution diagrams based on the historical offset printing data, where the p-axis in the speed-pressure-transfer rate characteristic space distribution diagram is the offset printing pressure, the q-axis is the offset printing speed, the w-axis is the ink transfer rate, and one speed-pressure-transfer rate characteristic space distribution diagram corresponds to one offset printing viscosity;

[0031] Obtaining the ink characteristics based on the temperature-humidity-viscosity characteristic space distribution diagram, the preset target printing parameters, and the multiple speed-pressure-transfer rate characteristic space distribution diagrams, where the target printing parameters include the target offset printing speed and the target ink transfer rate.

[0032] Optionally, obtaining the ink characteristics based on the temperature-humidity-viscosity characteristic space distribution diagram, the preset target printing parameters, and the multiple speed-pressure-transfer rate characteristic space distribution diagrams includes: ​

[0033] Perform the following operations on each of the speed-pressure-transfer rate characteristic space distribution diagrams among multiple speed-pressure-transfer rate characteristic space distribution diagrams:

[0034] Based on the target printing parameters, intercept the distribution data in the speed-pressure-transfer rate characteristic space distribution diagram where the offset printing speed is the target offset printing speed and the ink transfer rate is greater than or equal to the target ink transfer rate, and label the distribution data with the offset printing viscosity corresponding to the distribution data to obtain labeled data. Based on the labeled data, obtain a viscosity-pressure data set, where the viscosity-pressure data set includes a target viscosity and an available pressure range;

[0035] Extract the wet-temperature data set corresponding to the target viscosity from the temperature-humidity-viscosity characteristic space distribution diagram based on the viscosity-pressure data set, and associate the wet-temperature data set and the viscosity-pressure data set to obtain the initial ink characteristics;

[0036] Summarize the initial ink characteristics to obtain an initial ink characteristic set, screen and integrate the initial ink characteristic set to obtain an optimized parameter set corresponding to the ink type, and confirm the optimized parameter set as the ink characteristics.

[0037] Optionally, where the real-time ink distribution data is judged whether it is preset controllable data according to a preset frequency, including:

[0038] Obtain unit real-time ink distribution data according to a preset frequency, where the unit real-time ink distribution data includes multiple unit parameters, and the multiple unit parameters are respectively: real-time temperature, real-time ambient humidity, real-time motion parameters, real-time pressure parameters, and ink thickness;

[0039] Collect the unit real-time ink distribution data according to a preset monitoring period to obtain a period real-time ink distribution data set, and slide and intercept the period real-time ink distribution data set with a preset sliding window and a preset sliding step length to obtain multiple sliding operation parameters;

[0040] Extract the sliding operation parameters from the multiple sliding operation parameters in sequence, and perform the following operations on each of the extracted sliding operation parameters:

[0041] Obtain multiple sliding unit parameter sets based on the sliding operation parameters, extract the sliding unit parameter sets from the multiple sliding unit parameter sets in sequence, and perform the following operations on each of the extracted sliding unit parameter sets:

[0042] Calculate the mean value of the sliding unit parameter set to obtain a sliding unit mean value, calculate the mean error between the sliding unit mean value and a preset target mean value, and import the mean error into the feedback control unit to obtain an error signal;

[0043] Use the feedback control unit to judge whether the error signal belongs to a pre-constructed fuzzy control signal interval group;

[0044] If the error signal belongs to the fuzzy control signal interval group, identify the adjustment signal corresponding to the error signal from the fuzzy control signal interval group;

[0045] If there is a corresponding adjustment signal for each of the multiple sliding operation parameters, the real-time ink distribution data is confirmed as controllable data.

[0046] Optionally, the calculation formula for the real-time pressure parameter is:

[0047]

[0048] where ΔP represents the real-time pressure parameter, a represents the pressure sensitivity coefficient, Δl represents the wavelength change, b represents the pressure sensor parameter coefficient, E represents the Young's modulus of the pressure-sensitive diaphragm, δ represents the thickness of the pressure-sensitive chip, r represents the effective radius of the pressure-sensitive chip, and u represents the Poisson's ratio of the pressure-sensitive chip in the pressure sensor.

[0049] Optionally, after it is confirmed that the inking mechanism has completed the pre-constructed inking task based on the real-time offset printing data, an offset printing product is obtained, including

[0050] Obtain the inking pressure monitoring frequency, and based on the inking pressure monitoring frequency, monitor the real-time offset printing pressure of the inking mechanism in real time. Obtain a pressure error signal based on the real-time offset printing pressure. If the pressure error signal is within a preset offset printing pressure signal interval group, use a feedback control unit to adjust the inking mechanism;

[0051] Obtain the image monitoring frequency, obtain a real-time monitoring image based on the image monitoring frequency, and obtain an image to be offset printed based on the real-time monitoring image, where the image monitoring frequency is lower than the inking pressure monitoring frequency;

[0052] Perform a grayscale operation on the real-time monitoring image to obtain a grayscale real-time image. After confirming that the grayscale real-time image is a preset correctly-positioned image, identify the area corresponding to the grayscale real-time image from the image to be offset printed to obtain a comparison area, and perform a grayscale operation on the image corresponding to the comparison area to obtain a grayscale comparison image;

[0053] Based on the grayscale comparison image and the grayscale real-time image, construct a standard distribution matrix and a real-time distribution matrix, and calculate the difference matrix between the standard distribution matrix and the real-time distribution matrix, where the distribution of pixels in the difference matrix is the same as the distribution of pixels in the standard distribution matrix and the real-time distribution matrix, and the value of the pixel in the difference matrix is the difference between the grayscale value of the corresponding pixel in the standard distribution matrix and the grayscale value of the corresponding pixel in the real-time distribution matrix;

[0054] If the value corresponding to each pixel in the difference matrix is within the preset gray - scale value error range, obtain multiple real - time offset printing pressures based on the image monitoring frequency, confirm the multiple real - time offset printing pressures and the real - time monitoring image as real - time offset printing data, and confirm the real - time offset printing data as preset passable data, then return to the step of obtaining the real - time monitoring image based on the image monitoring frequency.

[0055] Until it is confirmed that the inking mechanism has completed the pre - constructed inking task based on the passable data, and then obtain the offset printing product; otherwise, perform an emergency stop operation on the inking mechanism.

[0056] Optionally, after confirming that the gray - scale real - time image is a preset correctly - positioned image, it includes:

[0057] Identify the circumscribed rectangle of the gray - scale real - time image and the circumscribed rectangle of the offset printing carrier respectively, to obtain the content circumscribed rectangle and the carrier circumscribed rectangle, where both the content circumscribed rectangle and the carrier circumscribed rectangle include four sides.

[0058] Extract the first content side from the content circumscribed rectangle, and extract the corresponding first carrier side from the carrier circumscribed rectangle, calculate the included angle between the first content side and the first carrier side to obtain the deviation angle. If the deviation angle is within the preset error range, and it is confirmed that the deviation angle corresponding to each side of the content circumscribed rectangle is within the preset error range, then confirm that the gray - scale real - time image is a preset correctly - positioned image.

[0059] To solve the above problems, the present invention also provides an electronic device, and the electronic device includes:

[0060] At least one processor; and,

[0061] A memory communicatively connected to the at least one processor; where,

[0062] The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to implement the above - mentioned method for optimizing the ink transfer performance based on offset printing pressure.

[0063] To solve the above problems, the present invention also provides a computer - readable storage medium, and at least one instruction is stored in the computer - readable storage medium, and the at least one instruction is executed by a processor in an electronic device to implement the above - mentioned method for optimizing the ink transfer performance based on offset printing pressure.

[0064] Compared with the problems described in the background art, the present invention receives a printing monitoring instruction, obtains the offset printing environment according to the printing monitoring instruction, ensures that the ink distribution mechanism can operate normally before offset printing, and sets the cooling mechanism to reduce the heat dissipation of the ink distribution mechanism during ink distribution, and can also ensure that the cooling mechanism can normally cool the ink distribution mechanism before offset printing. Based on the ink supply mechanism to obtain the ink and its characteristics, initialize the ink supply mechanism, ink distribution mechanism and monitoring unit according to the ink and its characteristics. Based on the initialized monitoring unit, real-time monitor the real-time ink distribution data of the initialized ink distribution mechanism. After confirming that the ink distribution mechanism has completed the pre-constructed ink distribution task based on the real-time ink distribution data, obtain the thinned ink. The embodiment of the present invention performs backward deduction guided by the target offset printing speed. Under the condition of ensuring the ink transfer rate, find the appropriate temperature range, appropriate humidity range and appropriate pressure range of the ink that can meet the requirements, and control the offset printing pressure during inking, so as to ensure the quality of offset printing. Use the thinned ink and the inking mechanism to perform offset printing on the pre-constructed offset printing carrier, and use real-time monitoring of the offset printing operation to obtain real-time offset printing data. Until it is confirmed that the inking mechanism has completed the pre-constructed inking task based on the real-time offset printing data, obtain the offset printing product, and complete the optimization of the ink transfer performance based on the offset printing pressure. When the present invention monitors the real-time offset printing pressure, adjust the inking mechanism in time with as high a frequency as possible to avoid the offset printing pressure of the inking mechanism being too large or too small, thus affecting the final offset printing effect. The feedback and monitoring of the product quality of the present invention are realized by comparing the corresponding areas of the real-time monitoring image and the image to be offset printed. Therefore, the image monitoring frequency lower than the inking pressure monitoring frequency is set. The present invention also calculates the angle between the first side of the content and the first side of the carrier to obtain the deviation angle. When the deviation angle corresponding to each side of the circumscribed rectangle of the content is within the preset error range, it means that the offset printed product is not skewed. Further, when the real-time offset printing data is passable data, it means that at the image monitoring frequency, the operation of the inking mechanism this time meets the target requirements of inking during offset printing, and there is no situation of too dark ink color, too light ink color or offset printing damage. Therefore, the method, device, electronic device and computer-readable storage medium for optimizing the ink transfer performance based on the offset printing pressure proposed by the present invention mainly aim to fuse multiple parameters to monitor and feedback adjust the offset printing process in real time and perform quality inspection on the offset printing products in real time on the premise of ensuring the ink transfer performance, so as to reduce material loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a schematic flow chart of a method for optimizing the ink transfer performance based on the offset printing pressure provided by an embodiment of the present invention;

[0066] Figure 2 It is a schematic structural diagram of an electronic device for implementing the method for optimizing the ink transfer performance based on the offset printing pressure provided by an embodiment of the present invention.

[0067] The realization of the purpose, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0068] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0069] The embodiment of the present application provides an optimization method for ink transfer performance based on offset printing pressure. The execution subject of the optimization method for ink transfer performance based on offset printing pressure includes, but is not limited to, at least one of electronic devices such as a server, a terminal, etc. that can be configured to execute the method provided by the embodiment of the present application. In other words, the optimization method for ink transfer performance based on offset printing pressure can be executed by software or hardware installed on a terminal device or a server device. The server includes, but is not limited to: a single server, a server cluster, a cloud server, or a cloud server cluster, etc.

[0070] Embodiment 1:

[0071] Refer to Figure 1 As shown, it is a flowchart of an optimization method for ink transfer performance based on offset printing pressure provided by an embodiment of the present invention. In this embodiment, the optimization method for ink transfer performance based on offset printing pressure includes:

[0072] S1. Receive a printing monitoring instruction, and obtain the offset printing environment according to the printing monitoring instruction.

[0073] Among them, the offset printing environment includes: an ink supply mechanism, an ink distribution mechanism, an inking mechanism, a cooling mechanism, a monitoring unit, and a feedback control unit.

[0074] It should be noted that the printing monitoring instruction is an instruction issued for monitoring during the offset printing pressure process. The ink supply mechanism is a mechanism that can store ink and quantitatively supply ink to the ink distribution mechanism. The ink distribution mechanism is a mechanism for evenly rolling the ink supplied by the ink supply mechanism into a thin film. The inking mechanism is a mechanism for transferring the ink evenly rolled by the ink distribution mechanism to the surface of the printing plate, and the pressure between the inking mechanism and the surface of the printing plate needs to be adjusted during the transfer process to ensure that the ink can adhere to the surface of the printing plate in a state that meets the inking requirements. The feedback control unit is a unit that generates an adjustment signal according to the result monitored by the monitoring unit and uses the adjustment signal to adjust the offset printing process.

[0075] Furthermore, the obtaining of the offset printing environment according to the printing monitoring instruction includes:

[0076] Obtain the parameters of the ink distribution element. Among them, the ink distribution mechanism includes: a single ink roller, an ink distribution roller, and a form roller;

[0077] After confirming that the inking element parameters are in the preset normal inking element state, obtain the cooling element parameters. Among them, the cooling mechanism includes: obtaining a first water pump, a heat exchanger, a cooling water tank, a second water pump, and cooling water pipes. Connect the first water pump, the heat exchanger, the cooling water tank, and the second water pump in series in sequence to obtain a cooling source. Pass the single ink roller, the inking roller, and the heavy roller through a cooling water pipe respectively, and connect the single ink roller, the inking roller, and the heavy roller in parallel after passing through the cooling water pipes to obtain a cooled inking member. Connect the cooled inking member and the cooling source in series;

[0078] After confirming that the cooling element parameters are in the preset normal cooling element state, confirm the offset printing environment based on the inking mechanism and the cooling mechanism.

[0079] It should be noted that the inking element parameters are the electrical parameters of the single ink roller, the inking roller, and the heavy roller in the inking mechanism. The electrical parameters may include whether the power connections of the single ink roller, the inking roller, and the heavy roller are unobstructed, and whether the single ink roller, the inking roller, and the heavy roller are in the preset positions, etc., which can be set manually, and the embodiments of the present invention do not limit this. The purpose of confirming that the inking element parameters are in the preset normal inking element state is to ensure that the inking mechanism can operate normally before offset printing. Therefore, the normal inking element state is the state when the preset inking mechanism can operate normally.

[0080] Specifically, the cooling element parameters are the parameters of each element in the cooling mechanism, including but not limited to: the cooling water flow rate, the preset heat exchange efficiency, whether the water pump is connected to the power supply, etc., and the embodiments of the present invention do not limit this. The purpose of confirming that the cooling element parameters are in the preset normal cooling element state is to ensure that the cooling mechanism can cool the inking mechanism normally before offset printing. It should also be noted that during the use of the inking mechanism, heat is often generated by the mutual friction between the single ink roller, the inking roller, and the heavy roller. However, if the ink is heated during the operation of the inking mechanism, the viscosity of the ink will change, thereby affecting the printing effect during offset printing. In order to improve the heat dissipation efficiency of the inking mechanism during inking, the cooling mechanism is provided in the embodiments of the present invention.

[0081] Furthermore, both the first water pump and the second water pump are water pumps, and "first" and "second" are only used for distinction. The cooling water tank is a tank for storing cooling water. The step of passing the single ink roller, the inking roller, and the heavy roller through a cooling water pipe respectively is: passing a cooling water pipe through the center of the single ink roller, that is to say, the single ink roller, the inking roller, and the heavy roller are all hollow cylinder structures.

[0082] S2. Obtain the ink and the ink characteristics based on the ink supply mechanism, and initialize the ink supply mechanism, the inking mechanism, and the monitoring unit according to the ink and the ink characteristics.

[0083] Among them, the ink characteristics include: ink type, ink viscosity, suitable temperature range of the ink, suitable humidity range, and suitable pressure range.

[0084] It should be noted that the ink type refers to the type of the ink. For example, cyan ink, black ink, etc. The initialization is to perform initial settings on the ink supply mechanism, ink leveling mechanism, and monitoring unit according to the ink and its characteristics. For example, setting the flow rate of the ink supply mechanism, the temperature of the ink leveling mechanism, etc.

[0085] Furthermore, the obtaining of the ink and its characteristics based on the ink supply mechanism includes:

[0086] Using a pre-constructed database to query the historical ink viscosity data corresponding to the ink type. Among them, the historical ink viscosity data is shown as follows:

[0087] N i =[T i ,M i

[0088] Among them, N i represents the i-th ink viscosity in the historical ink viscosity data, T i represents the i-th ink temperature in the historical ink viscosity data, and M i represents the i-th environmental humidity in the historical ink viscosity data;

[0089] Drawing a temperature-humidity-viscosity characteristic space distribution diagram based on the historical ink viscosity data. Among them, the x-axis in the temperature-humidity-viscosity characteristic space distribution diagram is the ink temperature, the y-axis is the environmental humidity, and the z-axis is the ink viscosity;

[0090] Obtaining historical offset printing data, where the historical offset printing data includes: multiple offset printing viscosities, multiple offset printing speeds, multiple offset printing pressures, and multiple ink transfer rates;

[0091] Drawing multiple speed-pressure-transfer rate characteristic space distribution diagrams based on the historical offset printing data. Among them, the p-axis in the speed-pressure-transfer rate characteristic space distribution diagram is the offset printing pressure, the q-axis is the offset printing speed, and the w-axis is the ink transfer rate, and one speed-pressure-transfer rate characteristic space distribution diagram corresponds to one offset printing viscosity;

[0092] Obtaining the ink characteristics based on the temperature-humidity-viscosity characteristic space distribution diagram, preset target printing parameters, and multiple speed-pressure-transfer rate characteristic space distribution diagrams. Among them, the target printing parameters include the target offset printing speed and the target ink transfer rate.

[0093] ​Further, the ink temperature is the temperature at which the ink transfer rate meets the artificial requirements during offset printing. The ink viscosity is the viscosity of the ink and can be used to describe the thickness of the ink. The ambient humidity is the humidity of the environment during the ink distribution process of the ink distribution mechanism. It should be noted that both the ink temperature and the ambient humidity can affect the ink viscosity, and for different ink types, different ink temperatures and ambient humidities correspond to an ink viscosity. Therefore, in the embodiments of the present invention, an ink temperature, an ambient humidity, and an ink viscosity are associated together as a data point, and a temperature-humidity-viscosity characteristic space distribution diagram is drawn by obtaining historical ink viscosity data. It should also be noted that after mapping the historical ink viscosity data to the unfilled temperature-humidity-viscosity characteristic space distribution diagram, it is also necessary to perform surface fitting on the temperature-humidity-viscosity characteristic space distribution diagram to form a continuous space distribution diagram. This technology is an existing technology and will not be elaborated here.

[0094] It should also be noted that the higher the ink temperature and the greater the ambient humidity, the smaller the ink viscosity. And the smaller the ink viscosity, the easier it is for the single ink roller, ink distribution roller, and heavy roller of the ink distribution mechanism to slip, which is not conducive to improving the ink transfer rate. Therefore, to improve the ink transfer rate, it is necessary to control the ink temperature and the ambient humidity.

[0095] Further, the method of drawing multiple speed-pressure-transfer rate characteristic space distribution diagrams based on historical offset printing data is similar to the method of drawing the temperature-humidity-viscosity characteristic space distribution diagram based on historical ink viscosity data, and will not be elaborated here. Further, the offset printing viscosity corresponds to the ink viscosity. However, in the embodiments of the present invention, the temperature-humidity-viscosity characteristic space distribution diagram has been made continuous in the foregoing, while the offset printing viscosity in the viscosity-speed-pressure characteristic space is not a continuous value.

[0096] It should be noted that the offset printing speed is the printing speed during offset printing. The offset printing pressure is the pressure between the inking mechanism and the surface of the printing plate during offset printing. The database is an existing database, which can be constructed by integrating papers, manufacturer data, expert experience, etc. For example, relevant usage data of this type of ink can be queried through papers. For example, the best temperature for cyan ink performance is 20 to 21.1 degrees Celsius. Therefore, the ink temperatures of 20 degrees Celsius and 21.1 degrees Celsius can be obtained, and the interval formed by 20 degrees Celsius and 21.1 degrees Celsius can be divided using a preset division step size to obtain multiple ink temperatures. Thus, there are multiple existing technologies to achieve this, and it will not be elaborated here.

[0097] Further, obtaining ink characteristics based on the temperature-humidity-viscosity characteristic space distribution diagram, preset target printing parameters, and multiple speed-pressure-transfer rate characteristic space distribution diagrams includes:

[0098] Perform the following operations on each of the speed-pressure-transfer rate characteristic space distribution diagrams in the multiple speed-pressure-transfer rate characteristic space distribution diagrams:

[0099] Intercept the distribution data in the speed-pressure-transfer rate characteristic space distribution diagram where the offset printing speed is the target offset printing speed and the ink transfer rate is greater than or equal to the target ink transfer rate based on the target printing parameters, and use the offset printing viscosity corresponding to the distribution data to label the distribution data to obtain labeled data. Based on the labeled data, obtain a viscosity-pressure data set, where the viscosity-pressure data set includes a target viscosity and an available pressure range;

[0100] Extract the wet-temperature data set corresponding to the target viscosity from the temperature-humidity-viscosity characteristic space distribution diagram based on the viscosity-pressure data set, and associate the wet-temperature data set and the viscosity-pressure data set to obtain the initial ink characteristics;

[0101] Summarize the initial ink characteristics to obtain an initial ink characteristics set, screen and integrate the initial ink characteristics set to obtain an optimized parameter set corresponding to the ink type, and confirm the optimized parameter set as the ink characteristics.

[0102] It should be noted that to improve the ink transfer rate and ensure the offset printing speed, it is necessary to control the ink viscosity and the offset printing pressure. The ink viscosity is related to the ink temperature and the environmental humidity. In this process, the offset printing speed, the environmental humidity, the ink temperature, and the offset printing pressure can be artificially controlled. The ink viscosity is determined according to the environmental humidity and the ink temperature, and the ink transfer rate is determined according to the offset printing speed and the offset printing pressure. Therefore, the embodiments of the present invention perform reverse deduction guided by the target offset printing speed. Under the condition of ensuring the ink transfer rate, find the suitable temperature range, suitable humidity range, and suitable pressure range of the ink that can meet the requirements, and control the offset printing pressure during inking, so as to ensure the quality of offset printing.

[0103] Specifically, the distribution data is the data intercepted from the speed-pressure-transfer rate characteristic space distribution diagram where the offset printing speed is the target offset printing speed and the ink transfer rate is greater than or equal to the target ink transfer rate. The labeling of the distribution data with the offset printing viscosity corresponding to the distribution data is a prior art. For example, the distribution data is labeled by using a text labeling method, which will not be elaborated here. The target viscosity is the offset printing viscosity corresponding to the labeled data, and the available pressure range is the range formed by the maximum offset printing pressure and the minimum offset printing pressure extracted from the labeled data.

[0104] Further, the method for extracting the wet-temperature data set corresponding to the target viscosity from the temperature-humidity-viscosity characteristic space distribution diagram based on the viscosity-pressure data set is as follows: find the interval of ink temperature formed by the maximum ink temperature and the minimum ink temperature corresponding to the target viscosity from the temperature-humidity-viscosity characteristic space distribution diagram, and then find the interval of ambient humidity formed by the maximum ambient humidity and the minimum ambient humidity corresponding to the target viscosity from the temperature-humidity-viscosity characteristic space distribution diagram, and associate the interval of ink temperature formed by the maximum ink temperature and the minimum ink temperature with the interval of ambient humidity formed by the maximum ambient humidity and the minimum ambient humidity to obtain the wet-temperature data set. The method for associating the wet-temperature data set and the viscosity-pressure data set is as follows: store the wet-temperature data set and the viscosity-pressure data set in one data, and the wet-temperature data set and the viscosity-pressure data set stored in one data are the initial ink characteristics.

[0105] It can be understood that in the above steps, the available pressure range determined by one ink viscosity is found according to the target printing parameters, and the wet-temperature data set is confirmed according to this one ink viscosity, so that the embodiments of the present invention can ensure that the ink transfer rate and the offset printing speed meet the target printing parameters under the conditions corresponding to the available pressure range and the wet-temperature data set. However, before this, the embodiments of the present invention have also constructed multiple speed-pressure-transfer rate characteristic space distribution diagrams. Therefore, by performing the same operations on the multiple speed-pressure-transfer rate characteristic space distribution diagrams, multiple ink viscosities that can meet the target printing parameters can be found, and thus multiple corresponding available pressure ranges and multiple wet-temperature data sets can be found. Therefore, the initial ink characteristic set is a set of multiple ink viscosities that can meet the target printing parameters, and each ink viscosity corresponds to a set composed of multiple available pressure ranges and multiple wet-temperature data sets.

[0106] Specifically, in the actual offset printing process, selecting one initial ink characteristic can achieve offset printing. The multiple initial ink characteristics are different. When different initial ink characteristics are introduced into the ink distribution mechanism, the thinned inks produced are also different. If you want to retain the data corresponding to all the initial ink characteristics in the ink distribution mechanism, you need to dynamically adjust the parameters of the inking mechanism for different initial ink characteristics. This process will greatly increase the energy consumption and the amount of calculation. Therefore, the present invention screens and integrates the initial ink characteristic set to obtain an optimized parameter set corresponding to the ink type, so as to select an optimal optimized parameter set from multiple initial ink characteristics. The screening process can be analyzed by the analytic hierarchy process or selected manually. There are various existing technical methods to achieve screening, and no examples are given here.

[0107] S3. Based on the initialized monitoring unit, monitor the real-time ink distribution data of the initialized ink distribution mechanism in real time.

[0108] Further, the real-time ink distribution data of the initialized ink distribution mechanism is monitored in real time based on the initialized monitoring unit, including:

[0109] Judging in real time whether the real-time ink distribution data is preset controllable data according to a preset frequency;

[0110] If the real-time ink distribution data is controllable data, an adjustment signal is generated based on the real-time ink distribution data and the feedback control unit, and the initialized ink distribution mechanism is subjected to a real-time feedback adjustment operation by using the adjustment signal to obtain an adjusted ink distribution mechanism. Taking the adjusted ink distribution mechanism as the initialized ink distribution mechanism, return to the step of judging in real time whether the real-time ink distribution data is preset controllable data according to a preset frequency;

[0111] If the real-time ink distribution data is not controllable data, the initialized ink distribution mechanism is stopped urgently, and the step of obtaining ink and ink characteristics based on the ink supply mechanism is returned.

[0112] It should be noted that the preset frequency is a frequency set artificially for monitoring the real-time ink distribution data. The real-time ink distribution data is the real-time ink distribution data of the initialized ink distribution mechanism monitored by the initialized monitoring unit at a preset frequency. The adjustment signal is a signal used to adjust the ink distribution mechanism. For example, the most suitable temperature of the ink in the initialized ink distribution mechanism is 20 degrees Celsius, but the initialized monitoring unit monitors that the temperature of the initialized ink distribution mechanism is 21 degrees Celsius. Therefore, the initialized ink distribution mechanism needs to be cooled down, and the temperature to be cooled down is 1 degree. Therefore, the feedback control unit generates an adjustment signal for reducing the temperature in the initialized ink distribution mechanism to 20 degrees Celsius. The real-time feedback adjustment operation is the operation of reducing the temperature in the initialized ink distribution mechanism to 20 degrees Celsius in this example.

[0113] It can be understood that the emergency stop is an emergency stop operation, which can stop the ink distribution mechanism. When the real-time ink distribution data is not preset controllable data, it means that for the ink distribution mechanism, it has exceeded the range that can be adaptively adjusted. In this case, it may be caused by reasons such as ink leakage and damage to the ink distribution mechanism. Therefore, it is necessary to stop urgently. After the emergency stop, return to the step of obtaining ink and ink characteristics based on the ink supply mechanism, that is, re-perform offset printing.

[0114] Further, the judging in real time whether the real-time ink distribution data is preset controllable data according to a preset frequency includes:

[0115] Obtaining unit real-time ink distribution data according to a preset frequency, where the unit real-time ink distribution data includes multiple unit parameters, and the multiple unit parameters are respectively: real-time temperature, real-time ambient humidity, real-time motion parameters, real-time pressure parameters, and ink thickness;

[0116] Collect the real-time ink distribution data of the unit according to the preset monitoring period to obtain a set of real-time ink distribution data for the period. Slide and intercept the set of real-time ink distribution data for the period with a preset sliding window and a preset sliding step length to obtain a plurality of sliding operation parameters;

[0117] Extract the sliding operation parameters from the plurality of sliding operation parameters in sequence, and perform the following operations on each of the extracted sliding operation parameters:

[0118] Based on the sliding operation parameters, obtain a plurality of sets of sliding unit parameters. Extract the sets of sliding unit parameters from the plurality of sets of sliding unit parameters in sequence, and perform the following operations on each of the extracted sets of sliding unit parameters:

[0119] Calculate the mean value of the set of sliding unit parameters to obtain a sliding unit mean value. Calculate the mean error between the sliding unit mean value and a preset target mean value, and import the mean error into a feedback control unit to obtain an error signal;

[0120] Use the feedback control unit to determine whether the error signal belongs to a pre-constructed fuzzy control signal interval group;

[0121] If the error signal belongs to the fuzzy control signal interval group, identify the adjustment signal corresponding to the error signal from the fuzzy control signal interval group;

[0122] If there is a corresponding adjustment signal for each of the plurality of sliding operation parameters, the real-time ink distribution data is confirmed as controllable data.

[0123] It should be noted that the unit real-time ink distribution data is the data composed of a plurality of unit parameters obtained in one monitoring. The real-time temperature is the temperature of the ink in the ink mechanism monitored in real time, the real-time ambient humidity is the temperature of the environment in the ink mechanism monitored in real time, the real-time motion parameters are the position parameters and speed parameters of each of the single ink roller, ink distribution roller and heavy roller in the ink mechanism monitored in real time. The position parameters can be obtained by spatial coordinates, and the speed parameters can be obtained by a speed sensor. The embodiments of the present invention are not limited herein. The purpose is to monitor whether the single ink roller, ink distribution roller and heavy roller move according to the preset trajectory and parameters, so as to judge whether the ink distribution mechanism is damaged. The real-time pressure parameter is the pressure between the heavy roller and the ink distribution roller in the ink mechanism monitored in real time. Monitoring the real-time pressure parameter is used to ensure the stability of the contact pressure between the single ink roller and the ink distribution roller, and avoid slippage or gaps during ink transfer.

[0124] It should be noted that the preset monitoring period includes multiple units' real-time ink distribution data. The sliding window and the sliding step are both prior arts. For example, if the preset frequency is once per second, then each second corresponds to a unit's real-time ink distribution data. If the preset monitoring period is 5 seconds, then the time period's real-time ink distribution data set includes 5 units' real-time ink distribution data. Assuming the size of the sliding window is 3 and the sliding step is 1, and the time period's real-time ink distribution data set is [A, B, C, D, E], then multiple sliding operation parameters can be obtained as: [A, B, C], [B, C, D], [C, D, E]. Extract the sliding operation parameters from the multiple sliding operation parameters in sequence. Assuming the extracted sliding operation parameter is [A, B, C], then multiple sliding unit parameter sets are respectively: the real-time temperature corresponding to A, the real-time temperature corresponding to B, and the real-time temperature corresponding to C in [A, B, C] as the first sliding unit parameter set, the real-time ambient humidity corresponding to A, the real-time ambient humidity corresponding to B, and the real-time ambient humidity corresponding to C in [A, B, C] as the second sliding unit parameter set, and so on. Therefore, the multiple sliding unit parameter sets respectively correspond to real-time temperature, real-time ambient humidity, real-time motion parameters, and real-time pressure parameters.

[0125] Exemplarily, if the extracted sliding unit parameter set is the real-time temperature corresponding to A, the real-time temperature corresponding to B, and the real-time temperature corresponding to C as the first sliding unit parameter set, then the sliding unit mean value is:

[0126]

[0127] Wherein, represents the sliding unit mean value.

[0128] Furthermore, the optimized parameter set includes the parameters corresponding to the sliding unit mean value. And in the embodiment of the present invention, it has been confirmed above that the optimized parameter set includes the best parameters for offset printing in the ink distribution mechanism. Therefore, when the target parameter corresponding to the sliding unit mean value exists in the optimized parameter set, the preset target parameter is set based on the optimized parameter set. If the target parameter corresponding to the sliding unit mean value does not exist in the optimized parameter set, the preset target parameter is set manually. For example, if the sliding operation parameter is real-time motion parameters, the target parameter of the real-time motion parameters needs to be queried according to the set trajectory in the ink distribution mechanism. If the sliding operation parameter is real-time ambient humidity, it can be found from the optimized parameter set.

[0129] It should be noted that the mean error is the difference between the sliding unit mean and the optimized parameter corresponding to the preset target parameter. The error signal is a signal calculated based on the mean error for guiding the generation of the adjustment signal. The fuzzy control signal interval group is a set composed of multiple fuzzy control signal intervals. Each fuzzy control signal interval corresponds to a fuzzy control signal, and the fuzzy control signal can be generated by the PID control algorithm. For example, the sliding unit mean of the ink distribution mechanism is 20 °C, and the corresponding target parameter is 21 °C. At this time, the error signal indicates that the difference between the real-time temperature and the target parameter is 1 °C. Therefore, an error signal is generated. The existing fuzzy control signal interval group includes multiple fuzzy control signal intervals, which are: [19.5 °C - 19.6 °C], [19.6 °C - 19.7 °C], ……, [20 °C - 20.1 °C], ……, [22.1 °C - 22.2 °C], and each fuzzy control signal interval in the multiple fuzzy control signal intervals corresponds to a fuzzy control signal. The sliding unit mean is 20 °C and exists between [20 °C - 20.1 °C]. Therefore, at this time, the fuzzy control signal of [20 °C - 20.1 °C] can be directly called as the adjustment signal.

[0130] It should be noted that the calculation formula of the real-time pressure parameter is:

[0131]

[0132] Wherein, ΔP represents the real-time pressure parameter, a represents the pressure sensitivity coefficient, Δl represents the wavelength change amount, b represents the pressure sensor parameter coefficient, E represents the Young's modulus of the pressure-sensitive diaphragm, δ represents the thickness of the pressure-sensitive chip, r represents the effective radius of the pressure-sensitive chip, and u represents the Poisson's ratio of the pressure-sensitive chip in the pressure sensor.

[0133] It can be understood that in the embodiment of the present invention, a pressure sensor is used to monitor the real-time pressure parameter.

[0134] S4. After confirming that the ink distribution mechanism has completed the pre-constructed ink distribution task based on the real-time ink distribution data, thin ink is obtained.

[0135] Furthermore, the pre-constructed ink distribution task includes:

[0136] Pre-cooling the ink distribution mechanism by using a cooling mechanism;

[0137] When it is confirmed by the initialized monitoring unit that the pre-cooled ink distribution mechanism is in the preset cooling state, an available ink distribution mechanism is obtained, and the ink is transported to the available ink distribution mechanism according to the initialized ink supply mechanism to obtain the ink to be distributed;

[0138] Utilize a cooling mechanism to cool the available ink distributing mechanism that receives ink in real time, and after evenly distributing and thinning the to-be-distributed ink according to preset ink distribution parameters and the available ink distributing mechanism, obtain thinned ink, and confirm the pre-constructed ink distribution task based on the thinned ink.

[0139] It should be noted that the pre-cooling is to control the temperature of the ink distributing mechanism before the ink distributing mechanism receives ink, so as to ensure that when the ink reaches the ink distributing mechanism, the ink distributing mechanism has already been at the temperature of optimizing the ink temperature in the parameter set. The cooling state is the state when it is confirmed that the ink distributing mechanism has already been at the temperature of optimizing the ink temperature in the parameter set. The to-be-distributed ink is the ink in the available ink distributing mechanism. The real-time cooling is an operation of using a cooling mechanism to take away the heat dissipated by the ink distributing mechanism during the execution of the task. The ink distribution parameters are the states that the to-be-distributed ink needs to reach after being processed by the ink distributing mechanism. For example, the thickness of the thinned ink. Using the available ink distributing mechanism to evenly distribute and thin the to-be-distributed ink is an inherent step in the offset printing process and is prior art, so it will not be elaborated here.

[0140] S5. Use the thinned ink and the inking mechanism to perform offset printing operations on the pre-constructed offset printing carrier, and use real-time monitoring of the offset printing operations to obtain real-time offset printing data, where the real-time offset printing data includes: real-time monitoring images and multiple real-time offset printing pressures.

[0141] It can be understood that the offset printing carrier is the carrier to which the ink needs to be offset printed.

[0142] S6. Until it is confirmed based on the real-time offset printing data that the inking mechanism has completed the pre-constructed inking task, obtain an offset printing product, and complete the optimization of the ink transfer performance based on the offset printing pressure.

[0143] Furthermore, the step of until it is confirmed based on the real-time offset printing data that the inking mechanism has completed the pre-constructed inking task and obtaining an offset printing product includes

[0144] Obtain the inking pressure monitoring frequency, and based on the inking pressure monitoring frequency, real-time monitor the real-time offset printing pressure of the inking mechanism, obtain a pressure error signal based on the real-time offset printing pressure. If the pressure error signal is within the preset offset printing pressure signal interval group, use the feedback control unit to adjust the inking mechanism;

[0145] Obtain the image monitoring frequency, obtain the real-time monitoring image based on the image monitoring frequency, and obtain the image to be offset printed based on the real-time monitoring image, where the image monitoring frequency is lower than the inking pressure monitoring frequency;

[0146] Perform grayscale operation on the real-time monitoring image to obtain a grayscale real-time image. After confirming that the grayscale real-time image is the preset correct-position image, identify the area corresponding to the grayscale real-time image from the image to be offset printed to obtain a comparison area, and perform grayscale operation on the image corresponding to the comparison area to obtain a grayscale comparison image;

[0147] Based on the grayscale comparison image and the grayscale real-time image, construct a standard distribution matrix and a real-time distribution matrix, and calculate the difference matrix between the standard distribution matrix and the real-time distribution matrix. Among them, the distribution of pixels in the difference matrix is the same as that of pixels in the standard distribution matrix and the real-time distribution matrix, and the value of pixels in the difference matrix is the difference between the grayscale value of the corresponding pixel in the standard distribution matrix and the grayscale value of the corresponding pixel in the real-time distribution matrix;

[0148] If the value corresponding to each pixel in the difference matrix is within the preset grayscale value error range, obtain multiple real-time offset printing pressures based on the image monitoring frequency, confirm the multiple real-time offset printing pressures and the real-time monitoring image as real-time offset printing data, and confirm the real-time offset printing data as the preset passable data, and return to the step of obtaining the real-time monitoring image based on the image monitoring frequency,

[0149] Until it is confirmed based on the passable data that the inking mechanism has completed the pre-constructed inking task, a printed product is obtained; otherwise, an emergency stop operation is performed on the inking mechanism.

[0150] It can be understood that the inking pressure monitoring frequency is the frequency of monitoring the real-time offset printing pressure in the inking mechanism. The step of obtaining the error signal according to the preset frequency in the step of obtaining the pressure error signal based on the real-time offset printing pressure and judging in real time whether the real-time ink distribution data is the preset controllable data according to the preset frequency is the same and can achieve the same effect. Therefore, the pressure error signal is similar to the error signal, and the offset printing pressure signal interval group is similar to the fuzzy control signal interval group, which will not be elaborated here.

[0151] It should be noted that the image monitoring frequency is the frequency when obtaining real-time monitoring images, and the image monitoring frequency is lower than the inking pressure monitoring frequency. For example, when monitoring the real-time offset printing pressure, use the highest possible frequency, so as to timely adjust the inking mechanism and avoid the offset printing pressure of the inking mechanism being too large or too small, thus affecting the final offset printing effect. In the embodiments of the present invention, the feedback and monitoring of product quality are realized by comparing the corresponding areas of the real-time monitoring image and the image to be offset printed. If the image monitoring frequency is too high at this time, it may result in obtaining a real-time monitoring image after only a very small part of the content on the image to be offset printed has been offset printed. For example, when there are multiple lines of text on the image to be offset printed, too high an image monitoring frequency may result in obtaining a real-time monitoring image before even one line of text has been completely offset printed, which is not only difficult to compare with the image to be offset printed but also wastes energy consumption and computer computing power. Therefore, in the embodiments of the present invention, the image monitoring frequency is lower than the inking pressure monitoring frequency.

[0152] Further, the method of identifying the area corresponding to the grayscale real-time image from the image to be offset printed is a prior art. For example, in an offset printing process, taking 0s as the origin and 2s as the end point, a real-time monitoring image is obtained at 2s. Then the real-time monitoring image represents the content offset printed during the 0 - 2s process. By identifying the area corresponding to the real-time monitoring image in the image to be offset printed, a comparison area is obtained.

[0153] It should be noted that the standard distribution matrix is a matrix composed of all pixels and the corresponding gray values in the image to be offset printed, and the arrangement of elements in the standard distribution matrix is the same as the arrangement of all pixels in the image to be offset printed. The real-time distribution matrix is similar to the standard distribution matrix and is a matrix based on all pixels and the corresponding gray values in the real-time monitoring image. The value of an element in the difference matrix is the difference between the gray value of the corresponding pixel in the standard distribution matrix and the gray value of the corresponding pixel in the real-time distribution matrix. The meaning is as follows: For example, there is an element A11 in the standard distribution matrix, and the corresponding element in the real-time distribution matrix is B11. Then subtract the gray value corresponding to B11 from the gray value corresponding to A11 to obtain the gray value difference, and assign the gray value difference to the element position C11 corresponding to A11 and B11 in the difference matrix, and so on, which will not be elaborated here. Further, if the gray value difference at the position of element C11 in the difference matrix is within the preset gray value error range, and the value of each element in the difference matrix is within the preset gray value error range, then the multiple real-time offset printing pressures and the real-time monitoring images are confirmed as real-time offset printing data, and the real-time offset printing data is confirmed as the preset passable data. When the real-time offset printing data is passable data, it means that at the image monitoring frequency, the operation of the inking mechanism during this time meets the target requirements of inking during offset printing, and there is no situation of too dark ink color, too light ink color, or offset printing damage. The gray value error range is the artificially set allowable fluctuation range of the gray value difference.

[0154] It should also be noted that the real-time offset printing data includes real-time monitoring images and multiple real-time offset printing pressures because the image monitoring frequency is lower than the ink application pressure monitoring frequency. Therefore, when obtaining one real-time monitoring image, multiple real-time offset printing pressures have been obtained. In the real-time example of the present invention, the real-time offset printing data is constructed based on obtaining one real-time monitoring image as a standard.

[0155] Further, after confirming that the grayscale real-time image is a preset correctly-positioned image, it includes:

[0156] Respectively identify the circumscribed rectangle of the grayscale real-time image and the circumscribed rectangle of the offset printing carrier to obtain a content circumscribed rectangle and a carrier circumscribed rectangle, wherein both the content circumscribed rectangle and the carrier circumscribed rectangle include four sides;

[0157] Extract a first content side from the content circumscribed rectangle, and extract a corresponding first carrier side from the carrier circumscribed rectangle corresponding to the first content side, calculate the angle between the first content side and the first carrier side to obtain a deviation angle. If the deviation angle is within a preset error range, and it is confirmed that the deviation angles corresponding to each side of the content circumscribed rectangle are all within the preset error range, then it is confirmed that the grayscale real-time image is a preset correctly-positioned image.

[0158] Further, the first content side is a randomly extracted side from the content circumscribed rectangle, and the corresponding first carrier side to the first content side is a side that should be parallel to the first content side in the carrier circumscribed rectangle. The maximum circumscribed rectangle is the rectangle obtained when detecting whether the offset printing content is skewed during the offset printing process. When the offset printing content is not skewed, that is, when the content of the grayscale real-time image does not appear skewed, the circumscribed rectangle of the grayscale real-time image should be similar to the circumscribed rectangle of the offset printing carrier, and the first content side and the first carrier side should be parallel. However, in the actual printing process, some errors are allowed. Therefore, in the embodiment of the present invention, the angle between the first content side and the first carrier side is calculated to obtain a deviation angle. When the deviation angles corresponding to each side of the content circumscribed rectangle are all within the preset error range, it indicates that the printed product is not skewed, and at this time, the grayscale real-time image is a correctly-positioned image.

[0159] It should be noted that during the monitoring of the ink application mechanism, if the ink application process is normal, multiple passable data can be obtained. Therefore, if each real-time offset printing data corresponds to passable data until the offset printing is completed, it indicates that the offset printed product has no abnormality, and the optimization of the ink transfer performance based on the offset printing pressure is completed.

[0160] Compared with the problems described in the background art, the present invention receives a printing monitoring instruction, obtains the offset printing environment according to the printing monitoring instruction, ensures that the ink distribution mechanism can operate normally before offset printing, and sets the cooling mechanism to reduce the heat dissipation of the ink distribution mechanism during ink distribution, and can also ensure that the cooling mechanism can normally cool the ink distribution mechanism before offset printing. Based on the ink supply mechanism to obtain the ink and ink characteristics, initialize the ink supply mechanism, ink distribution mechanism and monitoring unit according to the ink and ink characteristics, monitor the real-time ink distribution data of the initialized ink distribution mechanism in real time based on the initialized monitoring unit, and obtain the thinned ink after confirming that the ink distribution mechanism has completed the pre-constructed ink distribution task based on the real-time ink distribution data. The embodiment of the present invention performs backward deduction guided by the target offset printing speed, and searches for the appropriate temperature range, appropriate humidity range, and appropriate pressure range of the ink that can meet the requirements while ensuring the ink transfer rate, and controls the offset printing pressure during inking, so as to ensure the quality of offset printing. Use the thinned ink and the inking mechanism to perform offset printing on the pre-constructed offset printing carrier, and use the real-time monitoring of the offset printing operation to obtain real-time offset printing data, until the inking mechanism is confirmed to have completed the pre-constructed inking task based on the real-time offset printing data, and obtain the offset printing product, completing the optimization of the ink transfer performance based on the offset printing pressure. When the present invention monitors the real-time offset printing pressure, it adjusts the inking mechanism in a timely manner at the highest possible frequency to avoid the offset printing pressure of the inking mechanism being too large or too small, thus affecting the final offset printing effect. The feedback and monitoring of the product quality of the present invention are realized by comparing the corresponding areas of the real-time monitoring image and the image to be offset printed, so the image monitoring frequency lower than the inking pressure monitoring frequency is set. The present invention also calculates the angle between the first side of the content and the first side of the carrier to obtain the deviation angle. When the deviation angle corresponding to each side of the circumscribed rectangle of the content is within the preset error range, it means that the offset printed product is not skewed. Further, when the real-time offset printing data is passable data, it means that at the image monitoring frequency, the operation of the inking mechanism this time meets the target requirements of inking during offset printing, and there is no situation of too dark ink color, too light ink color or offset printing damage. Therefore, the method, device, electronic device and computer-readable storage medium for optimizing the ink transfer performance based on the offset printing pressure proposed by the present invention mainly aim to fuse multiple parameters to monitor and feedback adjust the offset printing process in real time while ensuring the ink transfer performance, and perform quality inspection on the offset printing products in real time to reduce material losses.

[0161] Embodiment 2:

[0162] As Figure 2 shown, it is a schematic structural diagram of an electronic device for implementing the method for optimizing the ink transfer performance based on the offset printing pressure provided by an embodiment of the present invention.

[0163] The electronic device 1 may include a processor 10, a memory 11, a bus 12, and a communication interface 13. It may also include a computer program stored in the memory 11 and executable on the processor 10, such as an ink transfer performance optimization program based on offset printing pressure.

[0164] Among them, the memory 11 includes at least one type of readable storage medium, which includes flash memory, mobile hard disk, multimedia card, card-type memory (such as SD or DX memory, etc.), magnetic memory, magnetic disk, optical disc, etc. In some embodiments, the memory 11 may be an internal storage unit of the electronic device 1, such as the mobile hard disk of the electronic device 1. In some other embodiments, the memory 11 may also be an external storage device of the electronic device 1, such as a plug-in mobile hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, etc. equipped on the electronic device 1. Further, the memory 11 may also include both an internal storage unit and an external storage device of the electronic device 1. The memory 11 can be used not only to store application software installed in the electronic device 1 and various types of data, such as the code of the ink transfer performance optimization program based on offset printing pressure, etc., but also to temporarily store data that has been output or will be output.

[0165] In some embodiments, the processor 10 may be composed of integrated circuits. For example, it may be composed of a single packaged integrated circuit, or may be composed of multiple integrated circuits with the same or different functions, including the combination of one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and various control chips, etc. The processor 10 is the control core (Control Unit) of the electronic device, connecting all components of the entire electronic device through various interfaces and lines, and by running or executing programs or modules stored in the memory 11 (such as the ink transfer performance optimization program based on offset printing pressure, etc.), and calling data stored in the memory 11, to execute various functions of the electronic device 1 and process data.

[0166] The bus may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. This bus can be divided into an address bus, a data bus, a control bus, etc. The bus is configured to enable connection communication between the memory 11 and at least one processor 10, etc.

[0167] Figure 2 Only an electronic device with components is shown. It can be understood by those skilled in the art that Figure 2 the shown structure does not constitute a limitation on the electronic device 1, and it may include fewer or more components than those shown, or combine certain components, or have different component arrangements.

[0168] For example, although not shown, the electronic device 1 may further include a power source (such as a battery) for supplying power to each component. Preferably, the power source can be logically connected to the at least one processor 10 through a power management device, so as to implement functions such as charge management, discharge management, and power consumption management through the power management device. The power source may also include any components such as one or more DC or AC power sources, a recharge device, a power failure detection circuit, a power converter or inverter, and a power status indicator. The electronic device 1 may also include various sensors, a Bluetooth module, a Wi-Fi module, etc., which will not be elaborated here.

[0169] Furthermore, the electronic device 1 may further include a network interface. Optionally, the network interface may include a wired interface and / or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which is generally used to establish a communication connection between the electronic device 1 and other electronic devices.

[0170] Optionally, the electronic device 1 may further include a user interface. The user interface may be a display, an input unit (such as a keyboard), and optionally, the user interface may also be a standard wired interface or a wireless interface. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch liquid crystal display, and an OLED (Organic Light-Emitting Diode) toucher, etc. Among them, the display may also be appropriately referred to as a display screen or a display unit, which is used to display the information processed in the electronic device 1 and to display a visual user interface.

[0171] It should be understood that the above embodiments are only for illustration purposes and are not limited by this structure in the scope of the patent application.

[0172] The ink transfer performance optimization program stored in the memory 11 in the electronic device 1 is a combination of multiple instructions. When running in the processor 10, it can implement:

[0173] Receiving a printing monitoring instruction, and obtaining an offset printing environment according to the printing monitoring instruction, where the offset printing environment includes: an ink supply mechanism, an ink distribution mechanism, an inking mechanism, a cooling mechanism, a monitoring unit, and a feedback control unit;

[0174] Based on the ink supply mechanism to obtain ink and ink characteristics, initialize the ink supply mechanism, ink distribution mechanism and monitoring unit according to the ink and ink characteristics, wherein the ink characteristics include: ink type, ink viscosity, suitable temperature range of the ink, suitable humidity range, suitable pressure range;

[0175] Based on the initialized monitoring unit to monitor the real-time ink distribution data of the initialized ink distribution mechanism in real time, after confirming that the ink distribution mechanism has completed the pre-constructed ink distribution task based on the real-time ink distribution data, obtain thinned ink;

[0176] Use the thinned ink and the inking mechanism to perform offset printing operations on the pre-constructed offset printing carrier, and monitor the offset printing operations in real time to obtain real-time offset printing data, wherein the real-time offset printing data includes: real-time monitoring images and multiple real-time offset printing pressures;

[0177] Until it is confirmed that the inking mechanism has completed the pre-constructed inking task based on the real-time offset printing data, obtain an offset printing product, and complete the optimization of the ink transfer performance based on the offset printing pressure.

[0178] Specifically, the specific implementation method of the processor 10 for the above instructions can refer to Figures 1 to 2 the description of the relevant steps in the corresponding embodiment, which will not be elaborated here.

[0179] Furthermore, if the modules / units integrated in the electronic device 1 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. The computer-readable storage medium can be volatile or non-volatile. For example, the computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM, Read-Only Memory).

[0180] The present invention also provides a computer-readable storage medium, the readable storage medium stores a computer program, and when the computer program is executed by the processor of the electronic device, it can implement:

[0181] Receive a printing monitoring instruction, and obtain the offset printing environment according to the printing monitoring instruction, wherein the offset printing environment includes: an ink supply mechanism, an ink distribution mechanism, an inking mechanism, a cooling mechanism, a monitoring unit and a feedback control unit;

[0182] Based on the ink supply mechanism to obtain ink and ink characteristics, initialize the ink supply mechanism, ink distribution mechanism and monitoring unit according to the ink and ink characteristics, wherein the ink characteristics include: ink type, ink viscosity, suitable temperature range of the ink, suitable humidity range, suitable pressure range;

[0183] Based on the initialized monitoring unit, the real-time ink distribution data of the initialized ink distribution mechanism is monitored in real time. After it is confirmed that the ink distribution mechanism has completed the pre-constructed ink distribution task based on the real-time ink distribution data, thinned ink is obtained;

[0184] The thinned ink and the inking mechanism are used to perform offset printing operations on the pre-constructed offset printing carrier, and the offset printing operations are monitored in real time to obtain real-time offset printing data. Among them, the real-time offset printing data includes: real-time monitoring images and multiple real-time offset printing pressures;

[0185] Until it is confirmed that the inking mechanism has completed the pre-constructed inking task based on the real-time offset printing data, an offset printing product is obtained, and the optimization of the ink transfer performance based on the offset printing pressure is completed.

[0186] The module described as a separation component may or may not be physically separated. The component shown as a module may or may not be a physical unit, that is, it may be located in one place, or it may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0187] In addition, in each embodiment of the present invention, each functional module can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated unit can be implemented in the form of hardware, or in the form of a combination of hardware and software functional modules.

[0188] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms.

[0189] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. An ink transfer performance optimization method based on offset printing pressure, characterized in that, The method includes: Receiving a printing monitoring instruction, and obtaining an offset printing environment according to the printing monitoring instruction, where the offset printing environment includes: an ink supply mechanism, an ink distribution mechanism, an inking mechanism, a cooling mechanism, a monitoring unit, and a feedback control unit; Obtaining ink and ink characteristics based on the ink supply mechanism, and initializing the ink supply mechanism, the ink distribution mechanism, and the monitoring unit according to the ink and ink characteristics, where the ink characteristics include: ink type, ink viscosity, suitable temperature range of the ink, suitable humidity range, and suitable pressure range; Based on the initialized monitoring unit, real-time monitoring the real-time ink distribution data of the initialized ink distribution mechanism. After confirming that the ink distribution mechanism has completed a pre-constructed ink distribution task based on the real-time ink distribution data, thinned ink is obtained; Performing an offset printing operation on a pre-constructed offset printing carrier using the thinned ink and the inking mechanism, and obtaining real-time offset printing data by real-time monitoring the offset printing operation, where the real-time offset printing data includes: real-time monitoring images and multiple real-time offset printing pressures; Until it is confirmed that the inking mechanism has completed a pre-constructed inking task based on the real-time offset printing data, an offset printing product is obtained, and the optimization of the ink transfer performance based on the offset printing pressure is completed.

2. The method for optimizing ink transfer performance based on offset printing pressure according to claim 1, wherein, The obtaining of the offset printing environment according to the printing monitoring instruction includes: Obtaining ink distribution element parameters, where the ink distribution mechanism includes: a single ink roller, an ink distribution roller, and a ductor roller; After confirming that the ink distribution element parameters are in a preset normal ink distribution element state, obtaining cooling element parameters, where the cooling mechanism includes: obtaining a first water pump, a heat exchanger, a cooling water tank, a second water pump, and a cooling water pipe. Connecting the first water pump, the heat exchanger, the cooling water tank, and the second water pump in series in sequence to obtain a cooling source. Passing the single ink roller, the ink distribution roller, and the ductor roller through a cooling water pipe respectively, and connecting the single ink roller, the ink distribution roller, and the ductor roller after passing through the cooling water pipe in parallel to obtain a cooled ink distribution member, and connecting the cooled ink distribution member and the cooling source in series; After confirming that the cooling element parameters are in a preset normal cooling element state, confirming the offset printing environment based on the ink distribution mechanism and the cooling mechanism.

3. The method for optimizing ink transfer performance based on offset printing pressure according to claim 2, wherein, The real-time monitoring of the real-time ink distribution data of the initialized ink distribution mechanism based on the initialized monitoring unit includes: Judging in real time whether the real-time ink distribution data is preset controllable data according to a preset frequency; If the real-time ink distribution data is controllable data, generating an adjustment signal based on the real-time ink distribution data and the feedback control unit, and performing a real-time feedback adjustment operation on the initialized ink distribution mechanism using the adjustment signal to obtain an adjusted ink distribution mechanism. Taking the adjusted ink distribution mechanism as the initialized ink distribution mechanism, and returning to the step of judging in real time whether the real-time ink distribution data is preset controllable data according to the preset frequency; If the real-time ink distribution data is not controllable data, immediately stopping the initialized ink distribution mechanism, and returning to the step of obtaining ink and ink characteristics based on the ink supply mechanism.

4. The method for optimizing ink transfer performance based on offset printing pressure according to claim 3, wherein The pre-constructed ink distribution task includes: Pre-cooling the ink distribution mechanism using the cooling mechanism; When it is confirmed by the initialized monitoring unit that the pre-cooled ink distribution mechanism is in a preset cooling state, an available ink distribution mechanism is obtained, and ink is transported to the available ink distribution mechanism according to the initialized ink supply mechanism to obtain ink to be distributed; Utilize a cooling mechanism to cool the available ink distribution mechanism that receives ink in real time, and after evenly distributing and thinning the to-be-distributed ink according to the preset ink distribution parameters and the available ink distribution mechanism, obtain thinned ink, and confirm the pre-constructed ink distribution task based on the thinned ink.

5. The method for optimizing ink transfer performance based on offset printing pressure as claimed in claim 4, wherein The obtaining of ink and ink characteristics based on the ink supply mechanism includes: Query the historical ink viscosity data corresponding to the ink type using a pre-constructed database, where the historical ink viscosity data is as follows: N i = [T i , M i ​ Among them, N i represents the i-th ink viscosity in the historical ink viscosity data, T i represents the i-th ink temperature in the historical ink viscosity data, M i represents the i-th environmental humidity in the historical ink viscosity data; Draw a temperature-humidity-viscosity characteristic space distribution diagram based on the historical ink viscosity data, where the x-axis in the temperature-humidity-viscosity characteristic space distribution diagram is the ink temperature, the y-axis is the ambient humidity, and the z-axis is the ink viscosity; Obtain historical offset printing data, where the historical offset printing data includes: multiple offset printing viscosities, multiple offset printing speeds, multiple offset printing pressures, and multiple ink transfer rates; Draw multiple speed-pressure-transfer rate characteristic space distribution diagrams based on the historical offset printing data, where in the speed-pressure-transfer rate characteristic space distribution diagram, the p-axis is the offset printing pressure, the q-axis is the offset printing speed, the w-axis is the ink transfer rate, and one speed-pressure-transfer rate characteristic space distribution diagram corresponds to one offset printing viscosity; Obtain ink characteristics based on the temperature-humidity-viscosity characteristic space distribution diagram, the preset target printing parameters, and multiple speed-pressure-transfer rate characteristic space distribution diagrams, where the target printing parameters include the target offset printing speed and the target ink transfer rate.

6. The method for optimizing ink transfer performance based on offset printing pressure according to claim 5, characterized in that The obtaining of ink characteristics based on the temperature-humidity-viscosity characteristic space distribution diagram, the preset target printing parameters, and multiple speed-pressure-transfer rate characteristic space distribution diagrams includes: Perform the following operations on each of the speed-pressure-transfer rate characteristic space distribution diagrams in the multiple speed-pressure-transfer rate characteristic space distribution diagrams: Intercept, based on the target printing parameters, the distribution data in the speed-pressure-transfer rate characteristic space distribution diagram where the offset printing speed is the target offset printing speed and the ink transfer rate is greater than or equal to the target ink transfer rate, and use the offset printing viscosity corresponding to the distribution data to label the distribution data to obtain labeled data, and obtain a viscosity-pressure data group based on the labeled data, where the viscosity-pressure data group includes a target viscosity and an available pressure range; Extract the humidity-temperature data group corresponding to the target viscosity from the temperature-humidity-viscosity characteristic space distribution diagram based on the viscosity-pressure data group, and associate the humidity-temperature data group and the viscosity-pressure data group to obtain initial ink characteristics; Summarize the initial ink characteristics to obtain an initial ink characteristic set, screen and integrate the initial ink characteristic set to obtain an optimized parameter set corresponding to the ink type, and confirm the optimized parameter set as the ink characteristics.

7. The method for optimizing the ink transfer performance based on the offset printing pressure according to claim 6, characterized in that Wherein, The real-time judgment of whether the real-time ink distribution data is preset controllable data according to the preset frequency includes: Obtain unit real-time ink distribution data according to the preset frequency, where the unit real-time ink distribution data includes multiple unit parameters, and the multiple unit parameters are respectively: real-time temperature, real-time ambient humidity, real-time motion parameters, real-time pressure parameters, and ink thickness; Collect the unit real-time ink distribution data according to the preset monitoring period to obtain a period real-time ink distribution data group, and slide and intercept the period real-time ink distribution data group with a preset sliding window and a preset sliding step length to obtain multiple sliding operation parameters; Extract the sliding operation parameters in sequence from multiple sliding operation parameters, and perform the following operations on each of the extracted sliding operation parameters: Obtain multiple sets of sliding unit parameters based on the sliding operation parameters, extract the sets of sliding unit parameters in sequence from the multiple sets of sliding unit parameters, and perform the following operations on each of the extracted sets of sliding unit parameters: Calculate the mean value of the set of sliding unit parameters to obtain the sliding unit mean value, calculate the mean error between the sliding unit mean value and a preset target mean value, and import the mean error into the feedback control unit to obtain an error signal; Use the feedback control unit to determine whether the error signal belongs to a pre-constructed fuzzy control signal interval group; If the error signal belongs to the fuzzy control signal interval group, identify the adjustment signal corresponding to the error signal from the fuzzy control signal interval group; If there is a corresponding adjustment signal for each of the multiple sliding operation parameters, the real-time ink equalization data is confirmed as controllable data.

8. The method for optimizing ink transfer performance based on offset printing pressure according to claim 7, characterized in that The calculation formula for the real-time pressure parameter is: where ΔP represents the real-time pressure parameter, a represents the pressure sensitivity coefficient, Δl represents the wavelength change amount, b represents the pressure sensor parameter coefficient, E represents the Young's modulus of the pressure-sensitive diaphragm, δ represents the thickness of the pressure-sensitive sheet, r represents the effective radius of the pressure-sensitive sheet, and u represents the Poisson's ratio of the pressure-sensitive sheet in the pressure sensor.

9. The method for optimizing ink transfer performance based on offset printing pressure according to claim 8, wherein After it is confirmed that the inking mechanism has completed the pre-constructed inking task based on the real-time offset printing data, the offset printing product is obtained, including Obtain the inking pressure monitoring frequency, and monitor the real-time offset printing pressure of the inking mechanism in real time according to the inking pressure monitoring frequency. Obtain a pressure error signal based on the real-time offset printing pressure. If the pressure error signal is within a preset offset printing pressure signal interval group, use the feedback control unit to adjust the inking mechanism; Obtain the image monitoring frequency, obtain the real-time monitored image based on the image monitoring frequency, and obtain the image to be offset printed based on the real-time monitored image, where the image monitoring frequency is lower than the inking pressure monitoring frequency; Perform a grayscale operation on the real-time monitored image to obtain a grayscale real-time image. After confirming that the grayscale real-time image is a preset correctly positioned image, identify the area corresponding to the grayscale real-time image from the image to be offset printed to obtain a comparison area, and perform a grayscale operation on the image corresponding to the comparison area to obtain a grayscale comparison image; Construct a standard distribution matrix and a real-time distribution matrix based on the grayscale comparison image and the grayscale real-time image, and calculate the difference matrix between the standard distribution matrix and the real-time distribution matrix. The distribution of pixels in the difference matrix is the same as the distribution of pixels in the standard distribution matrix and the real-time distribution matrix, and the value of the pixel in the difference matrix is the difference between the grayscale value of the corresponding pixel in the standard distribution matrix and the grayscale value of the corresponding pixel in the real-time distribution matrix; If the value corresponding to each pixel in the difference matrix is within a preset grayscale value error range, obtain multiple real-time offset printing pressures based on the image monitoring frequency, confirm the multiple real-time offset printing pressures and the real-time monitored image as real-time offset printing data, and confirm the real-time offset printing data as preset passable data, and return to the step of obtaining the real-time monitored image based on the image monitoring frequency Until after the pre-constructed inking task is completed based on the ink application mechanism that can be confirmed by data, an offset printing product is obtained; otherwise, an emergency stop operation is performed on the ink application mechanism.

10. The method for optimizing ink transfer performance based on offset printing pressure according to claim 9, characterized in that, After confirming that the grayscale real-time image is a preset correct-position image, it includes: Respectively identify the circumscribed rectangle of the grayscale real-time image and the circumscribed rectangle of the offset printing carrier to obtain a content circumscribed rectangle and a carrier circumscribed rectangle, where both the content circumscribed rectangle and the carrier circumscribed rectangle include four sides; Extract a content first side from the content circumscribed rectangle, and extract a corresponding carrier first side from the carrier circumscribed rectangle for the content first side, calculate the angle between the content first side and the carrier first side to obtain a deviation angle. If the deviation angle is within a preset error range, and it is confirmed that the deviation angles corresponding to each side of the content circumscribed rectangle are all within the preset error range, then it is confirmed that the grayscale real-time image is a preset correct-position image.

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