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Dynamic-Range Widening in a CMOS Image Sensor Through Exposure Control Over a Dual-Photodiode Pixel

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3 Author(s)
Jung-Bum Chun ; Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea ; Hunjoon Jung ; Chong-Min Kyung

In this paper, we propose a technique for automatic-exposure control and synthesis for a wide-dynamic-range sensor based on dual-exposure method. Using the proposed technique, a sensor can adaptively adjust its exposure to widely varying illumination conditions and consequently accomplish an infinite dynamic range in theory. An artificial test bench consisting of a virtual illumination source and its imaging system is introduced to verify the performance of the proposed technique. Simulations show how a wider dynamic range can be achieved by the proposed technique. It is also shown that a VGA-resolution CMOS image sensor developed based on the proposed technique can support up to a 119-dB dynamic range.

Published in:

Electron Devices, IEEE Transactions on  (Volume:56 ,  Issue: 12 )

Date of Publication:

Dec. 2009

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