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.
According to the problem that a single CCD camera can't meet the requirement in the process of print image acquisition, using multiple cameras is to acquire several images that have overlapping regions. In order to improve the efficiency of algorithm, two methods of similarity algorithm have been studied. Then both of the adaptability and the diversity of two algorithms have been verified by experiments.
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