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- Title
An Analog Gamma Correction Scheme for High Dynamic Range CMOS Logarithmic Image Sensors.
- Authors
Yuan Cao; Xiaofang Pan; Xiaojin Zhao; Huisi Wu
- 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.
- Subjects
COMPLEMENTARY metal oxide semiconductors; VOLTAGE-controlled oscillators; CMOS image sensors; HIGH dynamic range imaging; ANALOG-to-digital converters; ENERGY consumption; SIMULATION methods &; models
- Publication
Sensors (14248220), 2014, Vol 14, Issue 12, p24132
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s141224132