Abstract: On the automatic packaging lines which uses the aluminum-plastic blister packaging machine, in the tablets packaging process, tablet plate often appears empty, unqualified tablets(such as unfilled tablet, impurities, fragments, sticky tablets). Aiming at this problem, the paper develops a real-time tablets image detection and processing system by using the VC image processing technology. It is mainly used to detect unqualified tablets and tablet images detect with the improved median filtering, the difference image method, then classifies tablets with image identification and classification. This paper is more effect than traditional median filtering in getting rid of salt and pepper noise, it can resolve the defect of the gray cross between pills and pills, in the process of real production. It has detection ratio of 90% for tablet board which contains unqualified tablets(such as unfilled tablet, impurities, fragments、sticky tablets),meets the needs of actual production.

Key words: aluminum-plastic blister packaging machine, image processing, median filtering