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17 February 2007 High-performance camera module for fast quality inspection in industrial printing applications
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Proceedings Volume 6503, Machine Vision Applications in Industrial Inspection XV; 65030J (2007)
Event: Electronic Imaging 2007, 2007, San Jose, CA, United States
Today, printing products which must meet highest quality standards, e.g., banknotes, stamps, or vouchers, are automatically checked by optical inspection systems. Typically, the examination of fine details of the print or security features demands images taken from various perspectives, with different spectral sensitivity (visible, infrared, ultraviolet), and with high resolution. Consequently, the inspection system is equipped with several cameras and has to cope with an enormous data rate to be processed in real-time. Hence, it is desirable to move image processing tasks into the camera to reduce the amount of data which has to be transferred to the (central) image processing system. The idea is to transfer relevant information only, i.e., features of the image instead of the raw image data from the sensor. These features are then further processed. In this paper a color line-scan camera for line rates up to 100 kHz is presented. The camera is based on a commercial CMOS (complementary metal oxide semiconductor) area image sensor and a field programmable gate array (FPGA). It implements extraction of image features which are well suited to detect print flaws like blotches of ink, color smears, splashes, spots and scratches. The camera design and several image processing methods implemented on the FPGA are described, including flat field correction, compensation of geometric distortions, color transformation, as well as decimation and neighborhood operations.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Johannes Fürtler, Ernst Bodenstorfer, Konrad J. Mayer, Jörg Brodersen, Dorothea Heiss, Harald Penz, Christian Eckel, Klaus Gravogl, and Herbert Nachtnebel "High-performance camera module for fast quality inspection in industrial printing applications", Proc. SPIE 6503, Machine Vision Applications in Industrial Inspection XV, 65030J (17 February 2007);

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