High-speed line-scan camera with digital time delay integration

Ernst Bodenstorfer; Johannes Fürtler; Jörg Brodersen; Konrad J. Mayer; Christian Eckel; Klaus Gravogl; Herbert Nachtnebel

doi:10.1117/12.704516

26 February 2007 High-speed line-scan camera with digital time delay integration

Ernst Bodenstorfer, Johannes Fürtler, Jörg Brodersen, Konrad J. Mayer, Christian Eckel, Klaus Gravogl, Herbert Nachtnebel

Author Affiliations +

Proceedings Volume 6496, Real-Time Image Processing 2007; 64960I (2007) https://doi.org/10.1117/12.704516
Event: Electronic Imaging 2007, 2007, San Jose, CA, United States

Abstract

Dealing with high-speed image acquisition and processing systems, the speed of operation is often limited by the amount of available light, due to short exposure times. Therefore, high-speed applications often use line-scan cameras, based on charge-coupled device (CCD) sensors with time delayed integration (TDI). Synchronous shift and accumulation of photoelectric charges on the CCD chip - according to the objects' movement - result in a longer effective exposure time without introducing additional motion blur. This paper presents a high-speed color line-scan camera based on a commercial complementary metal oxide semiconductor (CMOS) area image sensor with a Bayer filter matrix and a field programmable gate array (FPGA). The camera implements a digital equivalent to the TDI effect exploited with CCD cameras. The proposed design benefits from the high frame rates of CMOS sensors and from the possibility of arbitrarily addressing the rows of the sensor's pixel array. For the digital TDI just a small number of rows are read out from the area sensor which are then shifted and accumulated according to the movement of the inspected objects. This paper gives a detailed description of the digital TDI algorithm implemented on the FPGA. Relevant aspects for the practical application are discussed and key features of the camera are listed.

Citation Download Citation

Ernst Bodenstorfer, Johannes Fürtler, Jörg Brodersen, Konrad J. Mayer, Christian Eckel, Klaus Gravogl, and Herbert Nachtnebel "High-speed line-scan camera with digital time delay integration", Proc. SPIE 6496, Real-Time Image Processing 2007, 64960I (26 February 2007); https://doi.org/10.1117/12.704516

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