Laser two-dimensional code positioning method

Abstract

The invention relates to a laser two-dimensional code positioning method which performs image preprocessing, image binarization, Canny operator edge detection, two-dimensional code coarse positioning, image frame refinement, position positioning indicator detection, image geometrical distortion correction two-dimensional code accurate positioning, etc. on a metal part two-dimensional code image to obtain an accurate positioning two-dimensional code image. The method utilizes an image morphological method to perform closed operation on a two-dimensional code binary image and to detect the outer contour of a two-dimensional image so as to obtain a coarse positioning two-dimensional code image, then utilizes an image frame refinement algorithm to obtain a two-dimensional code position detection figure and the center thereof, and utilizes a geometrical distortion algorithm to extract a positioned two-dimensional code so as to obtain a better two-dimensional code image. At present, the position positioning indicator and correction figure of a laser two-dimensional code image are unclear or irregular caused by chemical reaction in indication, so that a two-dimensional code can not be positioned by directly utilizing the characteristics of the position positioning indicator and correction figure; and according to the invention, the problem is solved.

Description

Technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a laser two-dimensional code positioning method used for image recognition of a laser two-dimensional code for identification of metal parts. Background technique [0002] Direct part marking means a special printing technology that can directly mark products without going through an intermediate carrier such as a label. This technology is particularly widely used in modern domestic and foreign manufacturing industries. At present, the technologies that can directly mark metal parts include laser marking, inkjet coding and pneumatic marking. Laser marking technology can not only ensure that the integrity of the metal workpiece is not damaged, but also etch out information patterns that can be permanently retained, which is very suitable for high-precision manufacturing industries. [0003] With the vigorous development of the Internet of Things industry and manufac...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a laser two-dimensional code positioning method, which solves the technical problem that the position locator and correction figure of the laser two-dimensional code image on the metal part are unclear or irregular due to the chemical reaction during marking , resulting in the inability to directly use the position locator and the characteristics of the correction graphic to locate the two-dimensional code

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