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Xiao-chen Li

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Proceedings Article | 6 August 2009 Paper

A wide dynamic range CMOS image sensor with operation mode change in security surveillance field

Xiao-chen Li, Su-ying Yao, Bin-qiao Li

Proceedings Volume 7384, 73841C (2009) https://doi.org/10.1117/12.835525

KEYWORDS: Surveillance, CMOS sensors, Image quality, Sensors, Interference (communication), Image sensors, Image enhancement, High dynamic range imaging, Camera shutters, Field effect transistors

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High dynamic range of the CMOS image sensor is important, especially applied to the security surveillance. While real scenes produce a wide range of brightness variations, vision systems use low dynamic range image detectors that typically provide poor quality images, which greatly limit what vision can acquire today. Due to the various environment of surveillance, dynamic range of image sensor is more important than other conditions. This paper demonstrates a new method for significantly improving the dynamic range. Compared to the other methods to enhance dynamic range like multiple sampling or multiple exposure and so on, the approach which this paper puts forward ensures image quality, at the same time, greatly improves the dynamic range of dark light conditions, and also easy to operate and accomplish. The sensor is implemented in 0.18-μm CMOS technology and achieves 5mm×5mm chip size with 6μm×6μm pixels. The results of the chip test are proposed in the paper. A scene with measured dynamic range exceeding 86dB but power is only about 70mW, which is especially suitable for security surveillance application.

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