Field-programmable gate array-based hardware architecture for high-speed camera with KAI-0340 CCD image sensor
2013
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.
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