High-performance camera module for fast quality inspection in industrial printing applications
| Autor: | Harald Penz, Konrad Mayer, Johannes Fürtler, Christian Eckel, Ernst Bodenstorfer, Klaus Gravogl, Herbert Nachtnebel, Jörg Brodersen, Dorothea Heiss |
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| Rok vydání: | 2007 |
| Předmět: |
Decimation
Flat-field correction Infrared Computer science business.industry Feature extraction ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Image processing medicine.disease_cause Camera interface Spectral sensitivity Feature (computer vision) medicine Computer vision Smart camera Artificial intelligence Image sensor business Ultraviolet Camera module |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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