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Proceedings Paper

Field-programmable gate array-based hardware architecture for high-speed camera with KAI-0340 CCD image sensor
Author(s): Hao Wang; Su Yan; Zuofeng Zhou; Jianzhong Cao; Aqi Yan; Linao Tang; Yangjie Lei
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Paper Abstract

We present a field-programmable gate array (FPGA)-based hardware architecture for high-speed camera which have fast auto-exposure control and colour filter array (CFA) demosaicing. The proposed hardware architecture includes the design of charge coupled devices (CCD) drive circuits, image processing circuits, and power supply circuits. CCD drive circuits transfer the TTL (Transistor-Transistor-Logic) level timing Sequences which is produced by image processing circuits to the timing Sequences under which CCD image sensor can output analog image signals. Image processing circuits convert the analog signals to digital signals which is processing subsequently, and the TTL timing, auto-exposure control, CFA demosaicing, and gamma correction is accomplished in this module. Power supply circuits provide the power for the whole system, which is very important for image quality. Power noises effect image quality directly, and we reduce power noises by hardware way, which is very effective. In this system, the CCD is KAI-0340 which is can output 210 full resolution frame-per-second, and our camera can work outstandingly in this mode. The speed of traditional auto-exposure control algorithms to reach a proper exposure level is so slow that it is necessary to develop a fast auto-exposure control method. We present a new auto-exposure algorithm which is fit high-speed camera. Color demosaicing is critical for digital cameras, because it converts a Bayer sensor mosaic output to a full color image, which determines the output image quality of the camera. Complexity algorithm can acquire high quality but cannot implement in hardware. An low-complexity demosaicing method is presented which can implement in hardware and satisfy the demand of quality. The experiment results are given in this paper in last.

Paper Details

Date Published: 21 August 2013
PDF: 8 pages
Proc. SPIE 8908, International Symposium on Photoelectronic Detection and Imaging 2013: Imaging Sensors and Applications, 890811 (21 August 2013); doi: 10.1117/12.2033013
Show Author Affiliations
Hao Wang, Xi'an Institute of Optics and Precision Mechanics (China)
Su Yan, Xi'an Institute of Optics and Precision Mechanics (China)
Zuofeng Zhou, Xi'an Institute of Optics and Precision Mechanics (China)
Jianzhong Cao, Xi'an Institute of Optics and Precision Mechanics (China)
Aqi Yan, Xi'an Institute of Optics and Precision Mechanics (China)
Linao Tang, Xi'an Institute of Optics and Precision Mechanics (China)
Yangjie Lei, Xi'an Institute of Optics and Precision Mechanics (China)


Published in SPIE Proceedings Vol. 8908:
International Symposium on Photoelectronic Detection and Imaging 2013: Imaging Sensors and Applications
Jun Ohta; Nanjian Wu; Binqiao Li, Editor(s)

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