Label defect detecting method

Abstract

The invention relates to a label defect detecting method. The label defect detecting method comprises the steps that image acquisition is conducted on a printed label; superposition is conducted on standard characters and all characters, to be compared with corresponding characters, on the label one by one, and similarity values are worked out; if the similarity value with the maximum sum result is larger than or equal to a first threshold value, the standard character corresponding to the similarity value with the maximum sum result is used as a character to be compared with the corresponding character, the current coordinates of the character to be compared with the corresponding character are recorded, whether the similarity value of the character to be compared with the corresponding character is smaller than a preset second threshold value, if yes, superposition is conducted on the corresponding standard character and the character to be compared with the corresponding standard character, and the number of times of the fact that the product of the corresponding standard character and the character to be compared with the corresponding standard character is zero is worked out, and the positions with the products being zero are connected, so that a defect area is formed; if the number of times of the fact that the product of the corresponding standard character and the character to be compared with the corresponding standard character is larger than a preset threshold value, the area of the defective area is larger than a preset fourth threshold value, and then color marking is conducted on the defective area. By the adoption of the label defect detecting method, the character defects appearing in the label can be recognized, and the comparison efficiency is high.

Description

technical field [0001] The invention relates to image processing technology, in particular to a label defect detection method. Background technique [0002] At present, in the market, each type of product is provided with a barcode label corresponding to this type of product to uniquely identify this type of product, and the barcode label is pasted or printed on the corresponding product; the barcode set on the barcode records a variety of product information , such as the manufacturer, product grade, production date, raw material supplier, etc., not only can scan the barcode label on the product to identify the relevant information of the product when purchasing the product, but also track product information and query history through the barcode label. [0003] Currently commonly used barcode labels are composed of multiple vertical lines and characters above or below the vertical lines. After printing the barcode label, the manufacturer also needs to manually check the b...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a label defect detection method, which can solve the problem that characters cannot be checked

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