A closed-loop, all-electronic pixel-wise adaptive imaging system for high dynamic range videography

Zhang, J and Newman, JP and Wang, X and Thakur, CS and Rattray, J and Etienne-Cummings, R and Wilson, MA (2020) A closed-loop, all-electronic pixel-wise adaptive imaging system for high dynamic range videography. In: IEEE Transactions on Circuits and Systems I: Regular Papers, 67 (6). pp. 1803-1814.

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Abstract

Digital cameras expose and readout all pixels in accordance with a global sample clock. This rigid global control of exposure and sampling is problematic for capturing scenes with large variance in brightness and motion, and may cause regions of motion blur, under- and overexposure. To address these issues, we developed a CMOS imaging system that automatically adjusts each pixel's exposure and sampling rate to fit local motion and brightness. This system consists of an image sensor with pixel-addressable exposure configurability in combination with a real-time, per-pixel exposure controller. It operates in a closed-loop to sample, detect and optimize each pixel's exposure and sampling rate for optimal acquisition. Per-pixel exposure control is implemented using all-integrated electronics without external optical modulation. This reduces system complexity and power consumption compared to existing solutions. Implemented using standard 130nm CMOS process, the chip has 256 � 256 pixels and consumes 7.31mW. To evaluate performance, we used this system to capture scenes with complex lighting and motion conditions that would lead to loss of information for globally-exposed cameras. These results demonstrate the advantage of pixel-wise adaptive. © 2004-2012 IEEE.

Item Type:	Journal Article
Publication:	IEEE Transactions on Circuits and Systems I: Regular Papers
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	Copy right for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	CMOS integrated circuits; Imaging systems; Luminance; Video recording, Adaptive imaging; Cmos imaging systems; Configurability; Global control; High dynamic range; Integrated electronics; Motion conditions; System complexity, Pixels
Department/Centre:	Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited:	11 Nov 2020 10:56
Last Modified:	11 Nov 2020 10:56
URI:	http://eprints.iisc.ac.in/id/eprint/65715

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