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Proceedings Paper

High-speed line-scan camera with digital time delay integration
Author(s): Ernst Bodenstorfer; Johannes Fürtler; Jörg Brodersen; Konrad J. Mayer; Christian Eckel; Klaus Gravogl; Herbert Nachtnebel
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Paper 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.

Paper Details

Date Published: 26 February 2007
PDF: 10 pages
Proc. SPIE 6496, Real-Time Image Processing 2007, 64960I (26 February 2007); doi: 10.1117/12.704516
Show Author Affiliations
Ernst Bodenstorfer, Austrian Research Ctrs. GmbH, ARC (Austria)
Johannes Fürtler, Austrian Research Ctrs. GmbH, ARC (Austria)
Jörg Brodersen, Austrian Research Ctrs. GmbH, ARC (Austria)
Konrad J. Mayer, Austrian Research Ctrs. GmbH, ARC (Austria)
Christian Eckel, Oregano Systems Design & Consulting GmbH (Austria)
Klaus Gravogl, Oregano Systems Design & Consulting GmbH (Austria)
Herbert Nachtnebel, Vienna Univ. of Technology (Austria)

Published in SPIE Proceedings Vol. 6496:
Real-Time Image Processing 2007
Nasser Kehtarnavaz; Matthias F. Carlsohn, Editor(s)

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