In the process of printing machines increasing and reduction of speed, the image collected from online detection system for different speed of printing needs picture adaptive processing. In this paper, there are two methods put forward to realize above goal. One method is sequential similarity detection algorithms and the other is ratio value. Apply with VC++ programming to realize image matching on the premise of the unique CCD detection equipment. The experiment results show that: sequential similarity algorithm on the premise of printing machine running in low speed, by comparing with threshold to realize variable-speed imaging. The ratio value method can be used for a variety of printing speed and it has high speed, high detection efficiency and wide range of application.
Considering the process of web print, the feature of this system, the specific requirements of subsequent testing software and presswork printed in web print, image absolute difference summation method was proposed to solve the image location problem of web printing whole image on-line detection system. The method was evaluated by print detection software, various print image and print matters with print defect. The results showed that the image located by this method is applied better in print whole image detection system and the locating speed meets the real-time requirement of on-line detection.
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