Abstract:

In order to separate the DataMatrix code image from complicated background, to improve the accuracy and speed of the decoding, we use the cross correlation matching algorithm to locate the code, then we use the “pyramid-layered algorithm" to reduce the calculation cost. The improved Hough transform is used to carry out the “L" boundary line of the image. The whole algorithm and the decoding process run on S3C2440 chip equipped with the Linux system. The result shows that with this algorithm, the decoding time of DataMatrix code can be reduced from 2. 3 s to 500 ms, and decoding accuracy can be improved from 85% to 100%, so it can meet the practical demands.

Key words: cross correlation, Hough transform, DataMatrix code, embedded system