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CMOS image sensor with analog gamma correction using nonlinear single-slope ADC | IEEE Conference Publication | IEEE Xplore

CMOS image sensor with analog gamma correction using nonlinear single-slope ADC


Abstract:

A human eye has the logarithmic response over wide range of light intensity. Although the gain can be set high to identify details in darker area on the image, this resul...Show More

Abstract:

A human eye has the logarithmic response over wide range of light intensity. Although the gain can be set high to identify details in darker area on the image, this results in saturation in brighter area. The gamma correction is essential to fit the human eye. However, the digital gamma correction degrades image quality especially for darker area on the image due to the limited ADC resolution and the dynamic range. This paper proposes a CMOS image sensor (CIS) with nonlinear analog-to-digital converter (ADC) which performs analog gamma correction. The CIS with the proposed nonlinear ADC conversion scheme was fabricated with a 0.35-/spl mu/m CMOS process. The test results show the improved image quality than digital gamma correction.
Date of Conference: 21-24 May 2006
Date Added to IEEE Xplore: 11 September 2006
Print ISBN:0-7803-9389-9

ISSN Information:

Conference Location: Kos, Greece

References

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