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Sensors 2014, 14(12), 24132-24145; doi:10.3390/s141224132

An Analog Gamma Correction Scheme for High Dynamic Range CMOS Logarithmic Image Sensors

1,†
,
2,†
,
1,* and 3
1
College of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, China
2
Department of Electronic and Computer Engineering, the Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
3
College of Computer Science and Software Engineering, Shenzhen University, Shenzhen 518060, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 4 November 2014 / Revised: 4 December 2014 / Accepted: 8 December 2014 / Published: 15 December 2014
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [1794 KB, uploaded 15 December 2014]   |  

Abstract

In this paper, a novel analog gamma correction scheme with a logarithmic image sensor dedicated to minimize the quantization noise of the high dynamic applications is presented. The proposed implementation exploits a non-linear voltage-controlled-oscillator (VCO) based analog-to-digital converter (ADC) to perform the gamma correction during the analog-to-digital conversion. As a result, the quantization noise does not increase while the same high dynamic range of logarithmic image sensor is preserved. Moreover, by combining the gamma correction with the analog-to-digital conversion, the silicon area and overall power consumption can be greatly reduced. The proposed gamma correction scheme is validated by the reported simulation results and the experimental results measured for our designed test structure, which is fabricated with 0.35 μm standard complementary-metal-oxide-semiconductor (CMOS) process. View Full-Text
Keywords: CMOS image sensor; analog gamma correction; high dynamic range; VCO-based ADC CMOS image sensor; analog gamma correction; high dynamic range; VCO-based ADC
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Cao, Y.; Pan, X.; Zhao, X.; Wu, H. An Analog Gamma Correction Scheme for High Dynamic Range CMOS Logarithmic Image Sensors. Sensors 2014, 14, 24132-24145.

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