CN-122018240-A - Plate-making exposure parameter setting method, device and medium for preprinted paperboard color sequence

CN122018240ACN 122018240 ACN122018240 ACN 122018240ACN-122018240-A

Abstract

The invention discloses a plate-making exposure parameter setting method, equipment and medium for preprinting paperboard color sequence, relating to the technical field of printing plate-making data processing, comprising the steps of collecting printing ink spectrum data, target color sequence data and layout image data and preprocessing; fusing the global exposure parameter set and the microstructure partition map, correcting the exposure of the microstructure area according to a preset local exposure adjustment strategy library to generate an exposure parameter map, performing CTP partition exposure platemaking and printing verification according to the exposure parameter map, detecting the reproduction quality of the microstructure area, and obtaining a qualified paperboard sample. According to the invention, the spectrum overprinting prediction is carried out by using the Neugebauer chromaticity overprinting model, so that the quantitative setting of the exposure based on the spectrum response characteristic is realized, the exposure regulation and control has the calculability and consistency aiming at different color sequence combinations, and the accuracy of the overall color matching is improved.

Inventors

MA WEIQIANG
ZHANG JIANHUA
YAN MINGTAO
LIU XIAONING
JIA HONGYI

Assignees

西安雄峰印刷包装有限公司

Dates

Publication Date: 20260512
Application Date: 20251230

Claims (10)

1. A method for setting plate-making exposure parameters of a preprinted paperboard color sequence is characterized by comprising the steps of, Collecting ink spectrum data, target color sequence data and layout image data and preprocessing; performing spectrum overprinting prediction on the preprocessed ink spectrum data and the target color sequence data by using a Neugebauer chromaticity overprinting model to generate a predicted spectrum curve, calculating exposure parameters and generating a global exposure parameter set; performing image analysis on the preprocessed layout image data by using an edge detection algorithm to generate a layout edge feature map, performing region connectivity judgment and structure classification on the layout edge feature map, and identifying a microstructure region in the layout image to generate a microstructure partition map; Fusing the global exposure parameter set and the microstructure partition map, and correcting the exposure of the microstructure area according to a preset local exposure adjustment strategy library to generate an exposure parameter map; And performing CTP partition exposure platemaking and printing verification according to the exposure parameter mapping diagram, detecting the reproduction quality of the microstructure area, and obtaining a qualified paperboard sample.
2. The method for setting plate-making exposure parameters of preprinted paper sheet color sequence according to claim 1, wherein the ink spectrum data comprises reflectance curves of the inks of each color and ink optical parameters; The target color sequence comprises a printing color sequence, a standard color value and a standard spectrum curve; The layout image data refers to layout lattice information; The preprocessing comprises denoising, normalization and image graying.
3. The method for setting plate-making exposure parameters of preprinted paper sheet color sequence according to claim 1, wherein the step of generating a predicted spectrum curve comprises the steps of, Inputting the preprocessed ink spectrum data and target color sequence data into a Neugebauer chromaticity overprinting model for data fusion calculation to obtain a spectrum input matrix; And executing Neugebauer chromaticity overprinting simulation operation based on the spectrum input matrix to generate a predicted spectrum curve.
4. The method for setting plate-making exposure parameters of preprinted cardboard color sequence according to claim 1, wherein the step of generating a global exposure parameter set comprises the steps of, Extracting a standard spectrum curve from the preprocessed target color sequence data, and performing wavelength-by-wavelength difference calculation by combining the standard spectrum curve and a predicted spectrum curve to generate a spectrum deviation vector; Performing reverse calculation on the exposure response relation of each color of ink according to the spectrum deviation vector to obtain an exposure adjustment quantity parameter set; carrying out parameter fusion on the exposure adjustment parameter set and a preset basic exposure parameter to generate an exposure comprehensive parameter matrix; and extracting the exposure time and the exposure energy of each color plate from the exposure comprehensive parameter matrix to generate a global exposure parameter set.
5. The method for setting plate-making exposure parameters of preprinted paper sheet color sequence according to claim 1, wherein the generating of the layout edge feature map comprises the following steps, Performing convolution calculation on the preprocessed layout image data by using an edge detection algorithm to generate pixel gradient amplitude data; and carrying out threshold segmentation processing on the pixel gradient amplitude data, extracting edge pixel characteristics, and generating a layout edge characteristic map.
6. The method for setting plate-making exposure parameters of preprinted paper sheet color sequence according to claim 1, wherein the step of generating the microstructure partition map comprises the following steps, Judging the regional connectivity of the layout edge feature map, and outputting a connected region marking matrix; Carrying out geometric feature recognition on each connected region according to the connected region marking matrix to generate a region feature data set; screening fine lines, micro dots and extreme dot density areas based on the area characteristic data set to generate a microstructure candidate area set; and mapping the microstructure candidate region set to a preset layout image coordinate system to generate a microstructure partition mapping diagram.
7. The method for setting exposure parameters for platemaking for preprinted paperboard color sequence of claim 1, wherein the step of generating an exposure parameter map comprises the steps of, Performing coordinate alignment fusion on the global exposure parameter set and the microstructure partition map to generate an exposure partition fusion data set; According to the exposure partition fusion data set, matching an exposure correction strategy of a corresponding area from a preset local exposure adjustment strategy library to generate an exposure correction strategy set; Performing dynamic correction calculation on the microstructure area exposure parameters in the exposure partition fusion data set according to the exposure correction strategy set to generate a microstructure correction exposure parameter set; And integrating the microstructure correction exposure parameter set with the exposure parameters of the normal area to generate an exposure parameter map.
8. The method for setting plate-making exposure parameters of preprinted paper sheet color sequence according to claim 1, wherein the step of obtaining qualified paper sheet sample comprises the following steps, Controlling CTP equipment to execute partition exposure platemaking operation according to the exposure parameter mapping chart, generating an exposed printing plate, and performing trial printing operation by using the exposed printing plate to obtain a pre-printed paperboard sample; image acquisition and feature extraction are carried out on the microstructure area in the preprinted paperboard sample through an image processing algorithm, and microstructure reproduction image data are obtained; performing quality analysis on the microstructure area based on the microstructure reproduction image data to generate a microstructure reproduction quality evaluation result; and carrying out quality judgment on the preprinted paperboard sample according to the microstructure reproduction quality evaluation result, and acquiring a qualified paperboard sample when the preset paperboard quality standard is met.
9. A computer device comprises a memory and a processor, wherein the memory stores a computer program, and the computer program is characterized in that the processor realizes the steps of the plate making exposure parameter setting method of the preprinted paperboard color sequence according to any one of claims 1-8 when executing the computer program.
10. A computer readable storage medium having a computer program stored thereon, wherein the computer program when executed by a processor performs the steps of the method for setting plate making exposure parameters of a preprinted cardboard color sequence as set forth in any one of claims 1 to 8.

Description

Plate-making exposure parameter setting method, device and medium for preprinted paperboard color sequence Technical Field The invention relates to the technical field of printing plate making data processing, in particular to a plate making exposure parameter setting method, equipment and medium for preprinted paperboard color sequence. Background The color sequence plate making of the preprinted paper board belongs to a key link in the printing plate making process, and the exposure condition is usually set according to the optical characteristics of the printing ink, the color sequence arrangement and the layout image structure information so as to obtain the printing plate meeting the overprinting color requirement. The traditional exposure parameters are formulated based on the corresponding relation between the reflection spectrum of the ink and the color standard, the whole exposure setting is completed through model prediction or experience adjustment, and the layout structure characteristics are identified by combining an image analysis method so as to ensure the imaging quality of image-text details. Along with the increasing complexity of the color sequence of the preprinted paper board, the coupling relation between the ink overprinting behavior and the layout microstructure becomes an important research direction for plate making exposure regulation and control. When the traditional method is used for processing the ink overprinting spectrum prediction, the color deviation of the whole area is used as a parameter adjustment basis, the local difference response to different color sequence combinations is insufficient, the global color consistency is difficult to be considered under the complex color sequence condition, and aiming at fine lines, tiny dots and high-density structure areas in a layout image, the traditional method cannot execute more targeted exposure regulation and control on the microstructure areas, and the insufficient local imaging detail restoration is easy to be caused. Disclosure of Invention The present invention has been made in view of the above-described problems occurring in the prior art. Therefore, the invention provides a plate-making exposure parameter setting method of a preprinted paperboard color sequence, which solves the problems that the global color consistency is difficult to ensure under the condition of complex color sequence overprinting and the exposure control fineness of a microstructure area is insufficient. In order to solve the technical problems, the invention provides the following technical scheme: The invention provides a plate making exposure parameter setting method of a preprinted paperboard color sequence, which comprises the steps of collecting ink spectrum data, target color sequence data and layout image data and preprocessing, carrying out spectrum overprinting prediction on the preprocessed ink spectrum data and the target color sequence data by using a Neugebauer chromaticity overprinting model, generating a prediction spectrum curve, calculating exposure parameters, generating a global exposure parameter set, carrying out image analysis on the preprocessed layout image data by using an edge detection algorithm, generating a layout edge feature map, carrying out area connectivity judgment and structure classification on the layout edge feature map, identifying a microstructure area in a layout image, generating a microstructure partition map, fusing the global exposure parameter set and the microstructure partition map, carrying out exposure correction on the microstructure area according to a preset local exposure adjustment strategy library, generating an exposure parameter map, carrying out CTP partition exposure platemaking and printing verification according to the exposure parameter map, detecting the reproduction quality of the microstructure area, and obtaining a qualified paperboard sample. As a preferable scheme of the plate-making exposure parameter setting method of the preprinted paperboard color sequence, the ink spectrum data comprises reflectance curves of various colors of ink and ink optical parameters; The target color sequence comprises a printing color sequence, a standard color value and a standard spectrum curve; The layout image data refers to layout lattice information; The preprocessing comprises denoising, normalization and image graying. As a preferable scheme of the plate-making exposure parameter setting method of the preprinted paperboard color sequence, the method for generating the predicted spectrum curve comprises the following steps of, Inputting the preprocessed ink spectrum data and target color sequence data into a Neugebauer chromaticity overprinting model for data fusion calculation to obtain a spectrum input matrix; And executing Neugebauer chromaticity overprinting simulation operation based on the spectrum input matrix to generate a predicted spectrum curve. As a preferable scheme of the pla