关键词: 直接零件标识, 金属表面, Data Matrix条码, 局部高光, 重构

Abstract: Direct Part Marking（DPM） is a process to mark parts permanently with product information including serial numbers, part numbers, date codes, and barcodes. This is done to allow the tracking of parts through the full life cycle. However, obtaining a high quality barcode image on metal surface is especially challenging due to the high reflective property of metal. Many barcodes are difficult to be read successfully because of the strong specular reflection. To solve this problem, this paper proposes a five-step-reconstruction model to restore the information in the highlight area. First, slant correction is carried out by orientating the “L finder pattern” right on the lower-left corner of the image. Then, each Data Matrix barcode module is located by mesh generation. Third, the highlight area is found by the Modified Specular-Free（MSF） image. Finally, the lost information in the highlight area is reconstructed by the proposed five-step-reconstruction model. The verification experiment shows that this algorithm can remove the highlight area reliably and make more Data Matrix symbols be read more easily.

Key words: direct part marking, metal surface, Data Matrix barcode, local specular, reconstruction