A 3D barcode preprocessing scheme based on image recognition

In this paper, we present a novel 3D barcode preprocessing technique used in tracking the metallic honeycomb catalyst, which is a part of the automobile, on the manufacturing process of automatic detection. Because the parts need identifying before and after routinely high-temperature heating treatment stage, the information of the online system in each stage varies largely together with big disturbance. Thus we identify 3D barcode on parts with an industrial camera under an auxiliary. illumination. Firstly, applying the method of image histogram equalization to enhance the contrast between bar and space, then transforming it by projection, next getting the bar and space information with self-adaptive threshold curve, finally detecting the correct information and gaining the parts' serial number decoding according to the national standard.