Plastic film printing character defect detection device and method

Abstract

The invention relates to a plastic film printing character defect detection device and method. The device comprises a static electricity generating module, a conveying module, an illumination module and a collection module, wherein the static electricity generating module is arranged on the conveying module; a detection region is arranged on the conveying module; an illumination module and a collection module are arranged above the detection region. The plastic film product can be flatly conveyed according to the preset speed; the illumination brightness and angle are regulated; a CCD area-array camera is used for regularly and completely acquiring image data; a progressive compensation algorithm and a bidirectional difference image method are used for accurately and effectively determining the existence and the type of the printing character defects; meanwhile, the defect information is subjected to automatic warning and deletion operation. The whole system does not need the participation of personnel; the intelligence of the whole system is realized; the character defect automatic detection, classification and deletion can be realized; the problems of high manual participation cost, low speed, low recognition rate and the like can be avoided; the detection on the printing character defects can be accurately and efficiently realized.

Description

technical field [0001] The invention belongs to the field of printing defect detection, and in particular relates to a defect detection device and method for characters printed on a plastic film. Background technique [0002] In daily life, people understand product information through characters on plastic films, and the quality of character printing directly affects the result of printed product information dissemination. However, due to the interference of uncertain factors in the printing process, the printed characters will have defects such as unclear printing, missing printing, white spots, wrinkles, dragging pens, broken strokes, etc., resulting in incomplete product character information, so that people can understand the product. Information has an impact, so the problem of character defects in printed products cannot be ignored. [0003] The early traditional defect detection method relied on manual detection, but the manual detection method has high cost, slow s...

AI Technical Summary

Problems solved by technology

However, due to the interference of uncertain factors in the printing process, the printed characters will have defects such as unclear printing, missing printing, white spots, wrinkles, dragging pens, broken strokes, etc., resulting in incomplete product character information, so that people can understand the product. Information has an impact, so the problem of character defects in printed products cannot be ignored

[0003] The early traditional defect detection method relied on manual detection, but the manual detection method has high cost, slow speed, and low recognition rate, and it is difficult to meet the requirements of mass production of packaging products

Although the accuracy and speed of the defect detection of printed characters are improved by the usual machine vision detection method nowadays, the character information is narrow and the detection is difficult. Accurate detection

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