Printing color difference correction method and device for digital transfer paper production

Abstract

The present invention relates to the technical field of printing color difference correction, and in particular to a printing color difference correction method and device for the production of digital transfer paper. The method obtains the color difference value of each inkjet point on the digital transfer paper within a specified printing time period, and obtains the color difference deviation degree of the specified printing time period according to the distribution of the color difference value, the change of temperature data and humidity data; obtains the correction coefficient of the printing parameter according to the difference in the color difference deviation degree between the current specified printing time period and the previous adjacent specified printing time period and the difference of each printing parameter, and the change of the color difference deviation degree of the current specified printing time period; obtains the corrected printing parameter at the current moment according to the size of the color difference value and the correction coefficient in the current specified printing time period. The present invention timely and accurately corrects the printing color difference in the digital transfer paper by obtaining each corrected printing parameter at the current moment, thereby ensuring the production quality of the digital transfer paper.

Description

Technical Field

[0001] The invention relates to the technical field of printing color difference correction, and in particular to a printing color difference correction method and equipment for digital transfer paper production. Background Art

[0002] With the continuous development of digital printing technology, digital transfer paper, as an important transfer material, is widely used in many industries such as textiles, ceramics, mobile phone cases, and home appliances, and has become a key tool for product customization and personalization. In the production process of digital transfer paper, printing color difference correction is a key link, which plays a vital role in the color reproduction and quality control of the final product. The printing color difference correction technology and equipment for the production of digital transfer paper are of great significance in ensuring color consistency and accuracy, especially in large-scale production and high-precision application scenarios. The effect of color difference correction directly affects the market competitiveness and user satisfaction of the product.

[0003] The existing method for correcting printing color difference is that technicians adjust the printing parameters of the printer to correct the color difference values ​​based on the color difference values ​​in the digital transfer paper and rely on their own operating experience. This is very inefficient and the manually adjusted printing parameters have errors, and cannot accurately and promptly respond to changes in the production process, affecting the production quality of the digital transfer paper. Summary of the invention

[0004] In order to solve the technical problem that the printing parameters adjusted manually have errors and cannot accurately and timely respond to changes in the production process, affecting the production quality of digital transfer paper, the purpose of the present invention is to provide a printing color difference correction method and device for digital transfer paper production. The technical solution adopted is as follows:

[0005] In a first aspect, an embodiment of the present invention provides a method for correcting printing color difference for digital transfer paper production, the method comprising the following steps:

[0006] Obtain the color difference value of each inkjet dot on the digital transfer paper within each specified printing time period, each printing parameter of the printer at each moment, and the temperature data and humidity data at each moment;

[0007] According to the distribution of color difference values, changes in temperature data and humidity data in each specified printing time period, the degree of color difference deviation in each specified printing time period is obtained;

[0008] Obtaining a correction coefficient for each printing parameter according to the difference in the degree of color difference deviation between the current designated printing time period and its previous adjacent designated printing time period and the difference in each printing parameter, as well as the change in the degree of color difference deviation in the current designated printing time period;

[0009] Each printing parameter at the current moment is corrected according to the color difference value in the current specified printing time period and the correction coefficient, and each corrected printing parameter at the current moment is obtained.

[0010] Furthermore, the method for obtaining the degree of color difference deviation is:

[0011] According to the distribution of color difference values ​​in each specified printing time period, the printing color difference satisfaction degree of each specified printing time period is obtained;

[0012] According to the changes of temperature data and humidity data in each specified printing time period, the environmental interference degree of each specified printing time period is obtained;

[0013] According to the printing color difference satisfaction degree and the environmental interference degree, the color difference deviation degree of each specified printing time period is obtained; wherein the printing color difference satisfaction degree is negatively correlated with the color difference deviation degree, and the environmental interference degree is positively correlated with the color difference deviation degree.

[0014] Furthermore, the method for obtaining the printing color difference satisfaction degree is:

[0015] For any specified printing time period, obtain the average value of all the differences between any two color difference values ​​in the specified printing time period as the color difference dispersion value of the specified printing time period;

[0016] The ratio of the mean value of all color difference values ​​in the specified printing time period to the standard color difference value is used as the color difference unqualified degree value of the specified printing time period;

[0017] The result of negatively correlating and normalizing the product of the color difference dispersion degree value and the color difference unqualified degree value is used as the printing color difference satisfaction degree of the specified printing time period.

[0018] Furthermore, the method for obtaining the degree of environmental interference is:

[0019] For any specified printing time period, obtaining a standard deviation of the temperature data in the specified printing time period as a first reference value;

[0020] Obtaining a standard deviation of the humidity data within the specified printing time period as a second reference value;

[0021] A result of normalizing the Euclidean norms of the first reference value and the second reference value is used as the environmental interference degree of the designated printing time period.

[0022] Furthermore, the correction coefficient is obtained by:

[0023] According to the difference in the degree of color difference deviation between the current designated printing time period and the previous adjacent designated printing time period and the difference in each printing parameter, the degree of color difference correlation of each printing parameter is obtained;

[0024] The ratio of the color difference deviation degree of the current designated printing time period to the color difference deviation degree of the previous adjacent designated printing time period is used as the color difference deviation change degree value of the current designated printing time period;

[0025] For any printing parameter, the product of the color difference deviation variation value and the color difference correlation degree of the printing parameter is normalized to obtain a correction coefficient of the printing parameter.

[0026] Furthermore, the method for obtaining the color difference correlation degree is:

[0027] Obtaining a color difference deviation degree difference between a current designated printing time period and a previous adjacent designated printing time period as a first difference;

[0028] For any printing parameter, obtain the average value of all printing parameters of this type in the current specified printing time period as the first value;

[0029] Obtaining the average value of all such printing parameters in the previous adjacent designated printing time period of the current designated printing time period as the second value;

[0030] taking the difference between the first value and the second value as a second difference;

[0031] A result of negatively correlating and normalizing the difference between the first difference and the second difference is used as the color difference correlation degree of the printing parameter.

[0032] Furthermore, the method for obtaining the modified printing parameters is:

[0033] Get the average value of all color difference values ​​in the current specified printing time period as the color difference reference value;

[0034] When the color difference reference value is greater than the standard color difference value, the product of each printing parameter at the current moment and its correction coefficient is obtained as the correction value of the corresponding printing parameter at the current moment;

[0035] The sum of each printing parameter at the current moment and its correction value is used as the corresponding corrected printing parameter at the current moment;

[0036] When the color difference reference value is less than or equal to the standard color difference value, each printing parameter at the current moment is used as each corrected printing parameter at the current moment.

[0037] Furthermore, when the color difference reference value is less than or equal to the standard color difference value, it also includes:

[0038] The product of each printing parameter at the current moment and its correction coefficient is used as each corrected printing parameter at the current moment.

[0039] Furthermore, the method for obtaining the color difference value is:

[0040] The CIE Lab value of each inkjet point on the digital transfer paper is obtained, and the difference between the CIE Lab value of each inkjet point and its expected CIE Lab value is used as the color difference value of the corresponding inkjet point.

[0041] In a second aspect, another embodiment of the present invention provides a printing color difference correction device for the production of digital transfer paper, the device comprising: a memory, a processor, and a computer program stored in the memory and running on the processor, when the processor executes the computer program, the steps of any one of the above methods are implemented.

[0042] The present invention has the following beneficial effects:

[0043] The present invention obtains the degree of color difference deviation of each specified printing time period according to the distribution of color difference values ​​in each specified printing time period, the change of temperature data and humidity data, and accurately reflects the obvious degree of printing color difference in each specified printing time period, which is conducive to the subsequent accurate correction of printing color difference; in order to analyze the influence of each printing parameter on printing color difference, and then accurately correct the printing parameter, it is determined that the printing color difference is effectively corrected, and then according to the difference in the degree of color difference deviation between the current specified printing time period and the previous adjacent specified printing time period and the difference of each printing parameter, as well as the change of the degree of color difference deviation of the current specified printing time period, the correction coefficient of each printing parameter is obtained, and the accurate correction is made. Reflecting the correction degree of each printing parameter at the current moment is conducive to the subsequent accurate correction of the printing parameters at the current moment and timely correction of the printing color difference; then correcting each printing parameter at the current moment according to the size of the color difference value and the correction coefficient in the current specified printing time period, accurately obtaining each corrected printing parameter at the current moment, so that the printing color difference in the digital transfer paper printing production process can be corrected, and in the actual printing production system, timely responding to changes in the production process, improving the accuracy of automatic adjustment of printing color difference in the production process of digital transfer paper, effectively improving production efficiency, reducing labor costs, and laying a solid foundation for improving the quality of the final product and market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 A schematic flow chart of a method for correcting printing color difference in the production of digital transfer paper provided by an embodiment of the present invention;

[0046] Figure 2 A flow chart of a method for obtaining a degree of color difference deviation provided by an embodiment of the present invention;

[0047] Figure 3 A flow chart of a method for obtaining a correction coefficient provided by an embodiment of the present invention;

[0048] Figure 4 A structural diagram of an intelligent monitoring device for automated peritoneal dialysis provided by one embodiment of the present invention;

[0049] Figure 5 A schematic diagram of a computer device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the printing color difference correction method and device for digital transfer paper production proposed by the present invention, its specific implementation, structure, features and effects, in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0051] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0052] The specific scheme of the printing color difference correction method and device for digital transfer paper production provided by the present invention is described in detail below with reference to the accompanying drawings.

[0053] Embodiment 1:

[0054] The specific implementation scenario of this embodiment is as follows: the existing printing color difference correction method is that the technician adjusts the printing parameters of the printer to correct the color difference value according to the color difference value in the digital transfer paper based on his own operating experience. The efficiency is very low and the manually adjusted printing parameters have errors, which cannot accurately and timely respond to changes in the production process, affecting the production quality of the digital transfer paper. In the actual digital transfer paper printing production process, the printing color difference is interfered by many factors, and the existing printing color difference correction method cannot accurately evaluate the correction results of the specific printing parameters. In order to timely and accurately correct each printing parameter of the printer to ensure the production quality of digital transfer paper and avoid the problem of printing color difference, the present embodiment first obtains the degree of color difference deviation of each designated printing time period according to the distribution of color difference values, changes in temperature data and humidity data in each designated printing time period; then obtains the correction coefficient of each printing parameter according to the difference in the degree of color difference deviation between the current designated printing time period and its previous adjacent designated printing time period and the difference in each printing parameter, as well as the change in the degree of color difference deviation of the current designated printing time period; finally, according to the size of the color difference value in the current designated printing time period, it is judged whether there is a color difference problem at the current moment, and then each printing parameter at the current moment is corrected by the correction coefficient of each printing parameter, and each corrected printing parameter at the current moment is accurately obtained, so that the printing color difference in the printing production process of digital transfer paper can be corrected in time, and the changes in the production process can be responded to in time in the actual printing production system, so as to improve the automatic adjustment accuracy of the digital transfer paper printer, effectively improve the production efficiency and quality of digital transfer paper, and reduce labor costs.

[0055] The present invention proposes a method for correcting color difference in printing for digital transfer paper production. Figure 1 , which shows a schematic flow chart of a method for correcting printing color difference for digital transfer paper production provided by an embodiment of the present invention, the method comprising the following steps:

[0056] Step S1: acquiring the color difference value of each inkjet dot on the digital transfer paper within each specified printing time period, each printing parameter of the printer at each moment, and the temperature data and humidity data at each moment.

[0057] The image on the digital transfer paper is directly printed on the paper by digital printing technology. However, in the process of printing using inkjet printing technology, there may be a certain color difference between the actual printing result and the expected image, and these printing color differences will affect the quality and market competitiveness of the final product. Therefore, accurately obtaining the printing color difference in the production process of digital transfer paper is an important link for correcting the printing color difference of the image in the digital transfer paper. In this embodiment, a high-precision colorimeter is installed in the printing color difference correction device to ensure that the colorimeter is calibrated normally, works stably and meets the measurement standards. At the same time, the printer is in a normal production working state, that is, the printer produces digital transfer paper according to various set printing parameters (such as nozzle temperature, ink ratio, printing speed and other printing parameters). The digital transfer paper printed by the printer will pass through the colorimeter, and the color difference between the image in the actual printed digital transfer paper and the expected image will be obtained through the colorimeter, and it is judged whether there is a color difference problem in the image in the digital transfer paper printed by the printer, and then the printing parameters of the printer are corrected in time, so that the printing color difference in the digital transfer paper printing production process can be corrected in time. Among them, in order to make the image in the digital transfer paper rich in color, color management software can be installed in the printer.

[0058] Considering that there may be accidental errors in the process of data collection by the colorimeter, this embodiment sets a specified printing time period, and analyzes the color difference in the digital transfer paper more accurately according to the color difference in the digital transfer paper actually printed in the specified printing time period. This embodiment sets the specified printing time period to 5 minutes. The implementer can set the length of the specified printing time period according to the actual situation, which is not limited here. Furthermore, this embodiment uses a colorimeter to obtain the color difference value of each inkjet point on the digital transfer paper in each specified printing time period, which is conducive to the subsequent analysis of the color difference of the digital transfer paper in the production process.

[0059] The method for obtaining the color difference value is as follows: in this embodiment, the CIE Lab value of each inkjet point on the digital transfer paper is obtained by a colorimeter, and the difference between the CIE Lab value of each inkjet point and its expected CIE Lab value is used as the color difference value of the corresponding inkjet point. The expected CIE Lab value of each inkjet point is pre-set.

[0060] In order to analyze the influence of printing parameters on printing color difference, and then accurately adjust the printing parameters to timely correct the color difference problem in the printing process of digital transfer paper, this embodiment obtains each printing parameter of the printer at each moment in each specified printing time period through the control system in the printing color difference correction device, so as to accurately analyze the influence of the printing parameters on the printing color difference in the subsequent printing, and then accurately correct the printing parameters. Considering that the environment will affect the printing of digital transfer paper, that is, the ink will dry quickly in a high temperature environment, which may cause the ink to fail to fully penetrate into the fibers of the digital transfer paper, thereby affecting the saturation and uniformity of the color of the image in the digital transfer paper; under high humidity, the digital transfer paper may absorb more water, causing the paper to swell, and the wet paper may change the permeability of the ink, causing the diffusion of the ink and the inconsistency of the color, thereby causing the image in the digital transfer paper to have a large color difference. In order to analyze the influence of environmental factors, a temperature and humidity sensor is installed in the printing color difference correction device to obtain the temperature data and humidity data at each moment in each specified printing time period. It should be noted that each printing parameter, temperature data and humidity data are synchronously obtained in each specified printing time period. In this embodiment, the time interval between two adjacent moments of collecting data is set to 2 seconds. The implementer can set the time interval between two adjacent moments of collecting data according to actual conditions, and it is not limited here.

[0061] It should be noted that the printing color difference correction device has been working for at least 10 minutes. If the current designated printing time period is less than 5 minutes, the current corresponding time period is still set as a designated printing time period.

[0062] Step S2: according to the distribution of the color difference values ​​in each designated printing time period, and the changes in the temperature data and the humidity data, the color difference deviation degree of each designated printing time period is obtained.

[0063] Specifically, when the difference between the color difference values ​​within a specified printing time period is greater, and the difference with the standard color difference value specified by the industry is greater, it means that the degree of printing color difference in the image on the digital printing paper within the specified printing time period is more serious, which indirectly indicates that the degree of color difference deviation in the specified printing time period is greater; wherein, the standard color difference value specified by the industry is known. Considering that in the production process of digital transfer paper, the printing color difference is interfered by a variety of influencing factors, and the influence of environmental factors on the printing color difference is very significant, that is, the influence of environmental factors on ink and paper during the printing process of digital transfer paper will cause certain error interference in the analysis of the printing color difference detection results. Among them, the temperature and humidity of the environmental factors have the most obvious influence on the printing color difference, and then within a specified printing time period, if the changes in temperature data and humidity data are greater, it means that the possibility of printing color difference caused by environmental influence within the specified printing time period is greater, that is, the degree of color difference deviation in the specified printing time period is greater. Then, according to the distribution of color difference values ​​within each specified printing time period, the changes in temperature data and humidity data, the degree of color difference deviation in each specified printing time period is obtained. The greater the degree of color difference deviation is, the greater the degree of printing color difference exists in the corresponding designated printing time period.

[0064] Preferably, in one possible implementation of this embodiment, the method for obtaining the degree of color difference deviation is as follows: Figure 2 , which shows a flow chart of a method for obtaining a color difference deviation degree provided in this embodiment, the method comprising the following steps:

[0065] Step S201: According to the distribution of the color difference values ​​in each specified printing time period, the printing color difference satisfaction degree of each specified printing time period is obtained.

[0066] When the color difference value distribution in a certain specified printing time period is more discrete and the difference with the standard color difference value specified by the industry is greater, it means that the degree of printing color difference in the image on the digital printing paper in the specified printing time period is more serious, which indirectly reflects that the printing color difference satisfaction degree of the specified printing time period is smaller. Then, according to the distribution of the color difference value in each specified printing time period, this embodiment obtains the printing color difference satisfaction degree of each specified printing time period. The smaller the printing color difference satisfaction degree is, the greater the degree of deviation of the printing color difference in the corresponding specified printing time period is.

[0067] Preferably, in a manner that can be implemented in this embodiment, the method for obtaining the printing color difference satisfaction degree is: for any specified printing time period, the average of the absolute values ​​of the differences between all arbitrary two color difference values ​​in the specified printing time period is obtained as the color difference dispersion degree value of the specified printing time period; the larger the color difference dispersion degree value, the more discrete the distribution of the color difference values ​​in the specified printing time period, which indirectly indicates that the color difference of the image on the digital transfer paper in the specified printing time period is more likely to deviate from the expectation, that is, the more obvious the existing printing color difference, the smaller the printing color difference satisfaction degree of the specified printing time period; in order to further analyze the specified printing time period, The printing color difference satisfaction degree of the specified printing time period is determined, and then the ratio of the mean value of all color difference values ​​in the specified printing time period to the standard color difference value is obtained as the color difference unqualified degree value of the specified printing time period; the larger the color difference unqualified degree value is, the color difference in the specified printing time period has exceeded the acceptable color difference range, and the smaller the printing color difference satisfaction degree of the specified printing time period is; in order to accurately determine the printing color difference satisfaction degree of the specified printing time period, this embodiment further negatively correlates and normalizes the product of the color difference discrete degree value and the color difference unqualified degree value as the printing color difference satisfaction degree of the specified printing time period.

[0068] Among them, the calculation formula for the printing color difference satisfaction is: ; In the formula, is the printing color difference satisfaction degree of the a-th specified printing time period; is the number of color difference values ​​in the ath specified printing time period; is the nth color difference value in the ath specified printing time period; is the mth color difference value in the ath specified printing time period; is the absolute value function; is the mean value of all color difference values ​​in the ath specified printing time period; is the standard color difference value; is the color difference discreteness value of the a-th specified printing time period; is the color difference unqualified degree value of the ath specified printing time period; exp is an exponential function with a natural constant as the base.

[0069] At this point, the printing color difference satisfaction level in each designated printing time period is obtained.

[0070] Step S202: Acquire the environmental interference degree of each designated printing time period according to the change of temperature data and humidity data in each designated printing time period.

[0071] For any specified printing time period, in order to comprehensively analyze the temperature data changes and humidity data changes within the specified printing time period, this embodiment obtains the standard deviation of the temperature data within the specified printing time period as the first reference value; obtains the standard deviation of the humidity data within the specified printing time period as the second reference value; and normalizes the Euclidean norm of the first reference value and the second reference value as the environmental interference degree of the specified printing time period. Among them, the method for obtaining the Euclidean norm is a well-known technology and will not be described in detail. Among them, the greater the degree of environmental interference, the greater the error interference degree of environmental factors on the printing color difference, which indirectly reflects that the degree of deviation of the printing color difference in the specified printing time period may be greater.

[0072] The calculation formula of environmental interference degree is: ; In the formula, is the environmental interference degree of the a-th specified printing time period; is the first reference value; is the second reference value; is the Euclidean norm; is the hyperbolic tangent function.

[0073] It should be noted that the Euclidean norm The larger the value is, the greater the comprehensive change of temperature data and humidity data in the a-th specified printing time period is, which indirectly indicates that the printing color difference in the a-th specified printing time period is more affected by the environment. The larger the value is, the greater the deviation of the printing color difference in the a-th specified printing time period may be due to environmental factors.

[0074] At this point, the environmental interference level in each designated printing time period is obtained.

[0075] Step S203: according to the printing color difference satisfaction degree and the environmental interference degree, obtaining the color difference deviation degree of each specified printing time period; wherein the printing color difference satisfaction degree is negatively correlated with the color difference deviation degree, and the environmental interference degree is positively correlated with the color difference deviation degree.

[0076] It is known that the smaller the printing color difference satisfaction is, the more serious the printing color difference problem is in the corresponding specified printing time period, that is, the greater the deviation of the printing color difference is; the greater the environmental interference is, the greater the error interference of the printing production environment on the printing color difference is, and the greater the deviation of the printing color difference in the corresponding specified printing time period may be; further, this embodiment obtains the color difference deviation degree of each specified printing time period according to the printing color difference satisfaction and the environmental interference degree; wherein, the printing color difference satisfaction is negatively correlated with the color difference deviation degree, and the environmental interference degree is positively correlated with the color difference deviation degree.

[0077] The calculation formula for obtaining the degree of color difference deviation is: ; In the formula, is the degree of color difference deviation in the a-th specified printing time period; is the printing color difference satisfaction degree of the a-th specified printing time period; The environmental interference level for the ath specified printing time period.

[0078] At this point, the degree of color difference deviation in each designated printing time period is obtained.

[0079] Step S3: obtaining a correction coefficient for each printing parameter according to the color difference deviation degree difference between the current designated printing time period and its previous adjacent designated printing time period and the difference of each printing parameter, as well as the change of the color difference deviation degree of the current designated printing time period.

[0080] In the production of digital transfer paper, the printing parameters of the printer are the key factors that cause printing color difference. For example, if the ink jetting amount is set too large or too small, printing color difference will be generated. Therefore, in the process of correcting the printing color difference, the correction of the printing parameters is indispensable. In actual situations, the degree of influence of different printing parameters on printing color difference is different, which indirectly reflects that the degree of correction of different printing parameters should also be different. In order to timely analyze the influence of each printing parameter on printing color difference, this embodiment first analyzes the difference in the degree of color difference deviation between the current designated printing time period and its previous adjacent designated printing time period and the difference in each printing parameter. When a certain printing parameter difference is more similar to the difference in the degree of color difference deviation, it means that the influence of this printing parameter on the color difference is greater, so when the printing color difference needs to be corrected, the degree of correction of this printing parameter should be greater.

[0081] In order to accurately analyze the degree to which the printing parameters need to be corrected at the current moment, this embodiment further analyzes the change in the degree of color difference deviation of the current designated printing time period. When the degree of change in the degree of color difference deviation of the current designated printing time period is greater, it means that the degree to which the printing parameters need to be corrected at the current moment is greater, ensuring accurate correction of the printing color difference. Furthermore, this embodiment obtains the correction coefficient of each printing parameter based on the difference in the degree of color difference deviation between the current designated printing time period and its previous adjacent designated printing time period and the difference of each printing parameter, as well as the change in the degree of color difference deviation of the current designated printing time period. At the current moment, if the printing color difference exceeds the acceptable range, the greater the correction coefficient, the greater the degree to which the corresponding printing parameter needs to be corrected at the current moment.

[0082] Preferably, in one possible implementation of this embodiment, the method for obtaining the correction coefficient is as follows: Figure 3 , which shows a flow chart of a method for obtaining a correction coefficient provided in this embodiment, the method comprising the following steps:

[0083] Step S301: acquiring the color difference correlation degree of each printing parameter according to the color difference deviation degree difference between the current designated printing time period and its previous adjacent designated printing time period and the difference of each printing parameter.

[0084] The greater the color difference correlation degree, the greater the influence of the corresponding printing parameters on the printing color difference at the current moment. When the printing color difference at the current moment exceeds the acceptable range, the corresponding printing parameters need to be corrected to a greater extent, so that the printing color difference is effectively corrected.

[0085] Preferably, in a method that can be implemented in this embodiment, the method for obtaining the color difference correlation degree is: obtaining the absolute value of the difference between the color difference deviation degree between the current designated printing time period and its previous adjacent designated printing time period as the first difference; for any printing parameter, obtaining the mean value of all such printing parameters in the current designated printing time period as the first value, accurately reflecting the size of the printing parameter in the current designated printing time period; obtaining the mean value of all such printing parameters in the previous adjacent designated printing time period of the current designated printing time period as the second value, accurately reflecting the size of the printing parameter in the previous adjacent designated printing time period of the current designated printing time period; taking the absolute value of the difference between the first value and the second value as the second difference; when the first difference is more equal to the second difference, it means that the influence of the printing parameter on the printing color difference at the current moment is greater, and then this embodiment negatively correlates and normalizes the absolute value of the difference between the first difference and the second difference as the color difference correlation degree of the printing parameter. The greater the color difference correlation degree, the greater the influence of the printing parameter on the printing color difference at the current moment.

[0086] Among them, the calculation formula of color difference correlation degree is: ; In the formula, is the color difference correlation degree of the z-th printing parameter; The color difference deviation degree of the currently specified printing time period; The color difference deviation degree of the previous adjacent specified printing time period of the current specified printing time period; is the first difference; is the first value; is the second value; is the second difference; exp is an exponential function with a natural constant as base; is the normalization function.

[0087] At this point, the color difference correlation degree of each printing parameter is obtained.

[0088] Step S302: taking the ratio of the color difference deviation degree of the current designated printing time period to that of the previous adjacent designated printing time period as the color difference deviation change degree value of the current designated printing time period.

[0089] The greater the color difference deviation change value, the greater the color difference deviation in the current printing time period, which indirectly reflects that the printing color difference at the current moment is more obvious. In order to correct the printing color difference and prevent the printing color difference from exceeding the acceptable range, the printing parameters at the current moment should be corrected to a greater extent.

[0090] Step S303: For any printing parameter, the product of the color difference deviation variation value and the color difference correlation degree of the printing parameter is normalized to obtain a correction coefficient of the printing parameter.

[0091] It is known that color consistency is crucial in the production of digital transfer paper. In particular, color difference correction can ensure that the color of each digital transfer paper is as consistent as possible during large-scale production, thereby ensuring the quality of the final transfer pattern, effectively reducing returns and reprints, reducing cost waste in production, and improving the production efficiency of digital transfer paper. In addition, this embodiment obtains the result of normalizing the product of the color difference deviation change value and the color difference correlation degree of each printing parameter as the correction coefficient of each printing parameter at the current moment, and determines the degree to which each printing parameter can be corrected at the current moment.

[0092] The calculation formula of the correction coefficient is: ; In the formula, is the correction coefficient of the zth printing parameter; The color difference deviation degree of the currently specified printing time period; The color difference deviation degree of the previous adjacent specified printing time period of the current specified printing time period; The value of the degree of color difference deviation change in the current specified printing time period; is the color difference correlation degree of the z-th printing parameter; norm is the normalization function.

[0093] It should be noted that the color difference deviation change degree value The larger the value is, the greater the color deviation is within the current specified printing time period. In order to prevent the color difference from exceeding the acceptable range, the printing parameters at the current moment need to be corrected to a greater extent. The bigger; The larger the value is, the greater the degree of correction of the z-th printing parameter is at the current moment, and the better the effect of correcting the printing color difference is. The larger the The larger the value is, the greater the degree to which the zth printing parameter needs to be corrected when the printing color difference at the current moment exceeds the acceptable range.

[0094] At this point, the correction coefficient of each printing parameter is obtained.

[0095] Step S4: correcting each printing parameter at the current moment according to the color difference value in the current designated printing time period and the correction coefficient, and obtaining each corrected printing parameter at the current moment.

[0096] In order to accurately and timely correct the printing color difference, this embodiment first determines whether the printing color difference needs to be corrected at the current moment according to the size of the color difference value in the current specified printing time period, and determines the correction direction of each printing parameter, that is, whether to increase or decrease it. Then, each printing parameter at the current moment is corrected by the correction coefficient of each printing parameter to obtain each corrected printing parameter at the current moment.

[0097] Among them, the method for obtaining the corrected printing parameters is: obtaining the average of all color difference values ​​in the current specified printing time period as the color difference reference value; when the color difference reference value is greater than the standard color difference value, the printing color difference at the current moment must be corrected to ensure the production quality of the digital transfer paper. At this time, the adjustment of the printing parameters is not strong enough, and the printing parameters need to be increased according to the correction coefficient of the printing parameters. Then, in this embodiment, the product of each printing parameter and its correction coefficient at the current moment is obtained as the correction value of the corresponding printing parameter at the current moment; then, the addition result of each printing parameter at the current moment and its correction value is used as the corresponding corrected printing parameter at the current moment; when the color difference reference value is less than or equal to the standard color difference value, the printing color difference at the current moment is within a reasonable range, which indirectly indicates that the setting of the printing parameters at the current moment is reasonable, and the printing parameters can be kept changing or appropriately reduced to further reduce the color difference. Then, in this embodiment, each printing parameter at the current moment can be used as each corrected printing parameter at the current moment, or each printing parameter at the current moment and the product of its correction coefficient can be used as each corrected printing parameter at the current moment.

[0098] At this point, each corrected printing parameter at the current moment is accurately obtained, and then the printing color difference in the digital transfer paper printing production process is corrected according to the corrected printing parameters, and the changes in the production process are responded to in a timely manner in the actual printing production system, thereby improving the automatic adjustment accuracy of the printing color difference in the digital transfer paper production process, effectively improving production efficiency, reducing labor costs, and laying a solid foundation for improving the quality of the final product and market competitiveness.

[0099] In summary, the present embodiment obtains the color difference value of each inkjet point on the digital transfer paper within the specified printing time period, and obtains the color difference deviation degree of the specified printing time period according to the distribution of the color difference value, the change of the temperature data and the humidity data; obtains the correction coefficient of the printing parameter according to the difference in the color difference deviation degree between the current specified printing time period and its previous adjacent specified printing time period and the difference of each printing parameter, as well as the change of the color difference deviation degree of the current specified printing time period; obtains the corrected printing parameter at the current moment according to the size of the color difference value and the correction coefficient within the current specified printing time period. The present invention timely and accurately corrects the printing color difference in the digital transfer paper by obtaining each corrected printing parameter at the current moment, thereby ensuring the production quality of the digital transfer paper.

[0100] Embodiment 2:

[0101] The present invention also proposes a printing color difference correction device for the production of digital transfer paper, see Figure 4 , which shows a structural diagram of a printing color difference correction device for digital transfer paper production provided by an embodiment of the present invention, the device includes: a data acquisition module 10, a color difference deviation degree acquisition module 20, a correction coefficient acquisition module 30 and a correction printing parameter acquisition module 40.

[0102] The data acquisition module 10 is used to acquire the color difference value of each inkjet point on the digital transfer paper within each specified printing time period, each printing parameter of the printer at each moment, and the temperature data and humidity data at each moment;

[0103] The color difference deviation degree acquisition module 20 is used to acquire the color difference deviation degree of each specified printing time period according to the distribution of the color difference values, the changes of the temperature data and the humidity data in each specified printing time period;

[0104] The correction coefficient acquisition module 30 is used to acquire the correction coefficient of each printing parameter according to the difference in the degree of color difference deviation between the current designated printing time period and its previous adjacent designated printing time period and the difference in each printing parameter, as well as the change in the degree of color difference deviation of the current designated printing time period;

[0105] The modified printing parameter acquisition module 40 is used to modify each printing parameter at the current moment according to the color difference value in the current specified printing time period and the correction coefficient, and obtain each modified printing parameter at the current moment.

[0106] It should be noted that: the device provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the computer device is divided into different functional modules to complete all or part of the functions described above. In addition, the printing color difference correction device for digital transfer paper production and the printing color difference correction method for digital transfer paper production provided in the above embodiment belong to the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0107] Embodiment 3:

[0108] The present invention also provides a computer device, see Figure 5 The computer device includes a memory 401, a processor 402, and a computer program 403 stored in the memory 401 and running on the processor 402, wherein when the processor 402 executes the computer program 403, the computer device can execute any one of the printing color difference correction methods for digital transfer paper production introduced above.

[0109] Embodiment 4:

[0110] The present invention also provides a computer-readable storage medium, in which a computer program code is stored. When the computer program code is run on a computer, the computer executes the above-mentioned related method steps to implement a printing color difference correction method for digital transfer paper production provided in the above embodiment.

[0111] Embodiment 5:

[0112] The present invention also provides a computer program product. When the computer program product is run on a computer, the computer is enabled to execute the above-mentioned related steps to implement a printing color difference correction method for digital transfer paper production provided in the above-mentioned embodiment.

[0113] Among them, the device, computer-readable storage medium, computer program product or chip provided in this embodiment is used to execute the corresponding method provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method provided above, and will not be repeated here.

[0114] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0115] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

Claims

1. A method for correcting color difference in printing for digital transfer paper production, characterized in that: The method comprises the following steps: Obtain the color difference value of each inkjet dot on the digital transfer paper within each specified printing time period, each printing parameter of the printer at each moment, and the temperature data and humidity data at each moment; According to the distribution of color difference values, changes in temperature data and humidity data in each specified printing time period, the degree of color difference deviation in each specified printing time period is obtained; Obtaining a correction coefficient for each printing parameter according to the difference in the degree of color difference deviation between the current designated printing time period and its previous adjacent designated printing time period and the difference in each printing parameter, as well as the change in the degree of color difference deviation in the current designated printing time period; Correct each printing parameter at the current moment according to the color difference value within the current specified printing time period and the correction coefficient, and obtain each corrected printing parameter at the current moment; The method for obtaining the degree of color difference deviation is: According to the distribution of color difference values ​​in each specified printing time period, the printing color difference satisfaction degree of each specified printing time period is obtained; According to the changes of temperature data and humidity data in each specified printing time period, the environmental interference degree of each specified printing time period is obtained; According to the printing color difference satisfaction degree and the environmental interference degree, the color difference deviation degree of each specified printing time period is obtained; wherein the printing color difference satisfaction degree is negatively correlated with the color difference deviation degree, and the environmental interference degree is positively correlated with the color difference deviation degree.

2. A method for correcting color difference in printing for digital transfer paper production as claimed in claim 1, characterized in that: The method for obtaining the printing color difference satisfaction degree is: For any specified printing time period, obtain the average value of all the differences between any two color difference values ​​in the specified printing time period as the color difference dispersion value of the specified printing time period; The ratio of the mean value of all color difference values ​​in the specified printing time period to the standard color difference value is used as the color difference unqualified degree value of the specified printing time period; The result of negatively correlating and normalizing the product of the color difference dispersion degree value and the color difference unqualified degree value is used as the printing color difference satisfaction degree of the specified printing time period.

3. A method for correcting color difference in printing for digital transfer paper production as claimed in claim 1, characterized in that: The method for obtaining the degree of environmental interference is: For any specified printing time period, obtaining a standard deviation of the temperature data in the specified printing time period as a first reference value; Obtaining a standard deviation of the humidity data within the specified printing time period as a second reference value; A result of normalizing the Euclidean norms of the first reference value and the second reference value is used as the environmental interference degree of the designated printing time period.

4. A method for correcting color difference in printing for digital transfer paper production as claimed in claim 1, characterized in that: The method for obtaining the correction coefficient is: According to the difference in the degree of color difference deviation between the current designated printing time period and the previous adjacent designated printing time period and the difference in each printing parameter, the degree of color difference correlation of each printing parameter is obtained; The ratio of the color difference deviation degree of the current designated printing time period to the color difference deviation degree of the previous adjacent designated printing time period is used as the color difference deviation change degree value of the current designated printing time period; For any printing parameter, the product of the color difference deviation variation value and the color difference correlation degree of the printing parameter is normalized to obtain a correction coefficient of the printing parameter.

5. A method for correcting color difference in printing for digital transfer paper production as claimed in claim 4, characterized in that: The method for obtaining the color difference correlation degree is: Obtaining a color difference deviation degree difference between a current designated printing time period and a previous adjacent designated printing time period as a first difference; For any printing parameter, obtain the average value of all printing parameters of this type in the current specified printing time period as the first value; Obtaining the average value of all such printing parameters in the previous adjacent designated printing time period of the current designated printing time period as the second value; taking the difference between the first value and the second value as a second difference; A result of negatively correlating and normalizing the difference between the first difference and the second difference is used as the color difference correlation degree of the printing parameter.

6. A method for correcting color difference in printing for digital transfer paper production as claimed in claim 1, characterized in that: The method for obtaining the modified printing parameters is: Get the average value of all color difference values ​​in the current specified printing time period as the color difference reference value; When the color difference reference value is greater than the standard color difference value, the product of each printing parameter at the current moment and its correction coefficient is obtained as the correction value of the corresponding printing parameter at the current moment; The sum of each printing parameter at the current moment and its correction value is used as the corresponding corrected printing parameter at the current moment; When the color difference reference value is less than or equal to the standard color difference value, each printing parameter at the current moment is used as each corrected printing parameter at the current moment.

7. A method for correcting color difference in printing for digital transfer paper production as claimed in claim 6, characterized in that: When the color difference reference value is less than or equal to the standard color difference value, it also includes: The product of each printing parameter at the current moment and its correction coefficient is used as each corrected printing parameter at the current moment.

8. A method for correcting color difference in printing for digital transfer paper production as claimed in claim 1, characterized in that: The method for obtaining the color difference value is: The CIE Lab value of each inkjet point on the digital transfer paper is obtained, and the difference between the CIE Lab value of each inkjet point and its expected CIE Lab value is used as the color difference value of the corresponding inkjet point.

9. A printing color difference correction device for digital transfer paper production, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When executing the computer program, the processor implements the steps of a printing color difference correction method for digital transfer paper production as described in any one of claims 1 to 8.

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