Method for positioning and identifying laser character of beer bottle cap

Abstract

The invention discloses a method for positioning and identifying a laser character of a beer bottle cap, which comprises the following steps: step 1, character positioning which comprises coarse positioning and fine positioning, that is, carrying out binaryzation, corrosion expansion, edge detection, contour tracing and Hough transform processing on a positioning character image, searching an angle between the straight lines on which two edges of the positioned character A are positioned, calculating a rotating angle of the character, searching coordinates of the center of the bottle cap, translating the center of the bottle cap to the center of an original bottle cap image, aligning the bottle cap image according to the calculated rotating angle of the character and repositioning the character; and step 2, character division and identification, wherein the character identification comprises the steps of extracting a 13 characteristic, extracting a protection statistical characteristic, extracting a coarse grid characteristic and finally carrying out matched identification on the character on the basis of the three character characteristics by utilizing a template matching method. The method disclosed by the invention aims at the character image of the bottle cap, which has a complex background and nonuniform illumination and implements the positioning on the laser character of the beer bottle cap, which rotates at a random angle.

Description

technical field [0001] The invention belongs to the technical field of character recognition of electronic supervisory codes, and relates to a positioning and recognition method of laser characters on beer bottle caps. Background technique [0002] In recent years, the research on electronic supervision code character recognition in the field of Internet of Things printing and packaging has achieved a large number of research results, which are widely used in license plate recognition, printing and packaging symbol recognition and other occasions. Under the current character recognition conditions, because the image quality to be recognized is generally good, the contrast of the target area is large, the target is still, and only rotates at a small angle, the noise interference is small, and the recognition accuracy is high. [0003] The positioning of laser characters on beer bottle caps is realized by image matching. The laser characters on beer bottle caps are composed o...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a positioning recognition method of laser characters on beer bottle caps, which solves the problem in the prior art that the characters on the bottle caps are difficult to recognize when the beer bottle caps are rotated at any angle

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