Abstract
Direct Part Marking(DPM) technology is an important means to achieve product identification,and 2D bar code technology is one of the keys.DPM logo of this paper made metal as a background and marked 2D with a laser above it.Compared to image recognition in 2D bar code based on print background,the image recognition in 2D bar code based on metal background is more complex.This paper improved the traditional identification methods,integrated use of the largest connected components extraction,the improved Hough transform,the code division based on maximum degree of matching and the gray image based on non-destructive method of information extraction to achieve the rough positioning,precise positioning,calibration,bar code segmentation and data extraction of the bar code images.The results show that this program has a strong anti-interference for the wear,light pollution,distortion and uneven illumination 2D barcode on the metal.Finally,reliable results were obtained.
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