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Method and device for backlight detection of low-contrast defects in printed matter

A low-contrast, backlight detection technology, applied in the field of optical detection, can solve the problems of low contrast, poor performance of defects in the background brightfield detection method, etc., and achieve the effect of improving the performance of defects

Active Publication Date: 2021-06-18
BEIJING LUSTER LIGHTTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this application is to provide a method and device for backlight detection of printed product defects, so as to solve the problem of poor performance of defects in the background bright field detection method when low-contrast defects appear in existing printed products

Method used

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  • Method and device for backlight detection of low-contrast defects in printed matter
  • Method and device for backlight detection of low-contrast defects in printed matter
  • Method and device for backlight detection of low-contrast defects in printed matter

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Embodiment Construction

[0050] refer to figure 1 , the embodiment of the present application provides a method for backlight detection of low-contrast defects in printed matter, including:

[0051] Step S1, obtaining printed matter information, the printed matter information includes the transparency of the printed matter and the ink color of the printed matter;

[0052] Printed matter is a printed product, which is a general term for various finished products produced by printing technology.

[0053] Print transparency is divided into transparent, translucent and opaque. Transparent printed matter means that most or even all of the color of the acrylic plate can pass through during backlight detection; translucent printed matter means that part of the color of the acrylic plate can pass through during backlight detection, such as printed matter with white as the background color; opaque printed matter It means that little or no color of the acrylic plate comes through during backlight detection, s...

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Abstract

The present application discloses a method and device for backlight detection of low-contrast defects in printed matter. The method includes acquiring printed matter information, the printed matter information including the transparency of the printed matter and the ink color of the printed matter; and adjusting the color of the acrylic plate according to the printed matter information. The backlight in this application uses a replaceable multi-color acrylic plate, selects different colors according to the actual defect and background color, uses color information to obtain a higher contrast between the defect and the background, and improves the defect performance of the background bright field detection method.

Description

technical field [0001] The present application relates to the technical field of optical detection, in particular to a method and device for detecting low-contrast defects in printed matter with backlight. Background technique [0002] With the promotion and use of printing automatic optical inspection equipment in the roll material printing industry, defects on printed matter can be detected by algorithms after camera imaging instead of manual inspection. Most defects in labels and pouches are currently detectable with automated optical inspection equipment, but low contrast defects show poor detection conditions. Low-contrast defects, that is, the color and grayscale of the defect and the background are similar. For roll materials, the white characters on the transparent background, the white characters on the translucent white background on the label, and the transparent bottom knife wire defects on the soft package are all low-contrast defects. The white characters on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/956
CPCG01N21/956
Inventor 陈菱婧姚毅
Owner BEIJING LUSTER LIGHTTECH