Method and system for detecting symmetry of printed matter

Abstract

A printed matter symmetry detection method and system, including real-time image preprocessing, determining the position of the edge of the paper in the image, determining the distance from the edge of the marked area to the edge of the paper and the width of the marked area, and determining the start position of the entire cycle of the upper left and lower right marking features, Then the symmetry analysis is performed on the left and right regions of interest, including calculating the symmetry measure and judging the symmetry defect. The invention provides a real-time detection scheme for overprinting products, one of which is fast and can achieve the effect of real-time processing, and the other is strong robustness. Based on the above two characteristics, in the actual production process, the present invention can be used to perform real-time detection, screen out unqualified products in time, and improve detection efficiency and economic benefits.

Description

technical field [0001] The method belongs to the technical field of image processing and recognition, and in particular relates to a method and system for detecting the symmetry of a printed matter. Background technique [0002] Due to the imperfect printing technology and some unavoidable random factors, defects such as blurred text, missing printing, scratches, and inaccurate registration often appear during the printing process. Taking tipping paper overprinting as an example, the hot stamping edge and hot stamping characters of tipping paper are sequential processes, and machine or human factors may cause overprint deviation, which is specifically manifested as the deviation of the upper, lower, left, and right positions between the gold edge and the paper edge, and the text and the gold edge; In the tipping paper, there are often defects such as missing printing of gold edges, false bronzing of text, lack of pens and strokes, and blurred text printing. For such defects...

AI Technical Summary

Problems solved by technology

[0004] In order to make full use of digital image processing and recognition technology, fully tap its practical value, and make it effectively serve the printing industry, this invention provides a technical solution for printing symmetry detection, which aims to solve the current situation where there are no measurement and control conditions at home and abroad Under the current situation, it is not possible to automatically and real-time detect and control the defects such as inaccurate registration of printed matter

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