Automatic detection method for printed product four-color register partial difference

A registration deviation and automatic detection technology, applied in the field of automatic detection of four-color registration deviation of printed products, can solve the problems of operator fatigue, difficulty, poor efficiency, etc., to achieve the improvement of automation degree and adjustment speed, easy operation and efficiency high effect

Inactive Publication Date: 2008-08-20
BEIJING UNIV OF TECH
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Problems solved by technology

This visual method has the following shortcomings: (1) low precision and poor efficiency, the minimum scale of the magnifying glass is generally around 20 microns to 50 microns, coupled with the visual error of the human eye, the visual accuracy of the registration deviation is low , the adjustment of the registration mechanism often requires experienced operators, and the entire registration adjustment process usually takes a long time to complete; (2) The operation process is cumbersome and difficult, which is easy to cause operator fatigue. Very careful, easy to cause eye fatigue and damage

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  • Automatic detection method for printed product four-color register partial difference

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Embodiment Construction

[0070] The present invention is described in further detail now in conjunction with accompanying drawing. figure 1 A flowchart showing the automatic detection method for four-color registration deviation of printed products involved in the present invention, as shown in the figure, the automatic detection method for four-color registration deviation of printed products includes the following steps:

[0071] 1. Preprocessing the registration mark image

[0072] The registration mark image S11 is input to the computer, and the color image vector median filter method is used for filtering to obtain the filtered color image IA. Then use the following method to segment the target marker and the image background for the color image:

[0073] (1) For all pixels in the entire color image IA, convert the image IA into a grayscale image IB. The conversion method is: the red, green, and blue gray values ​​of the pixels in the gray image IB are equal, and equal to the summed average of ...

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Abstract

The invention relates to an automatic detection method for four-color register deviation of printing, more particularly to a method, adopting image processing to calculate the four-color axial direction and circumferential direction register deviation. The method mainly comprises following steps: register marker image is pretreated, comprising color division, edge detection, and location of the register marker image; then object image is reversed; benchmark is selected optimally; the calculated register deviation outcome is exported; the invention gives the register deviation data of black, cyan, fuchsin, and yellow marker in axial and circumferential direction automatically after the register marker image is analyzed. The automatic detection method for four-color register deviation of printing has the advantages of high efficiency, high speed and easy operation.

Description

technical field [0001] The invention relates to an automatic detection method for four-color register deviation of printed products, in particular to a method for automatically calculating four-color axial and circumferential register deviation by image processing. Background technique [0002] In the process of four-color overprinting, special marks such as crosshairs and cat's eye graphics are often printed near the edge of the printed product. The operator adjusts the registration mechanism by estimating the size of the registration deviation. Finally, it is hoped that the black (B) mark, cyan ( C) mark, magenta (M) mark and yellow (Y) mark overlap as much as possible so that the printed matter can achieve the best clarity. Register control is a key link in four-color printing technology. [0003] At present, the detection and control of registration deviation is still in the way of manual visual inspection. The operator prints multiple printed products through the offs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41F33/00G01B11/00
Inventor 王跃宗
Owner BEIJING UNIV OF TECH
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