关键词: 二维条码, Data Matrix, 链码跟踪, 直线段提取, 线形连接

Abstract: A two-dimensional bar code recognition method based on chain code tracking and straight line segment extraction was proposed in order to realize quick identification of the Data Matrix two-dimensional bar code in the industrial field. Firstly, the Sobel operator was used to extract the edge of image. Secondly, the image edge points were tracked and chain codes were recorded based on chain code tracking method. Thirdly, line segment whose straight line similarity was below the threshold was removed with fast straight line segment extraction method. The fracture line was combined with the linear connection method and the unreliable line was excluded by length discrimination. Finally, the Data Matrix bar code was located with the characteristics of the Data Matrix two-dimensional bar code. The application test shows that the two-dimensional bar code area can be quickly and accurately located by the recognition method with the recognition rate of 99.39%. The proposed method is ready to meet the requirements of industrial field with strong real-time ability and high reliability.

Key words: two-dimensional bar code, Data Matrix, chain code tracking, straight line segment extraction, linear connection