TY - GEN
T1 - CMOS image sensor with analog gamma correction using nonlinear single-slope ADC
AU - Ham, Seogheon
AU - Lee, Yonghee
AU - Jung, Wunki
AU - Lim, Seunghyun
AU - Yoo, Kwisung
AU - Youngcheol, Chae
AU - Cho, Jihyun
AU - Lee, Dongmyung
AU - Han, Gunhee
PY - 2006
Y1 - 2006
N2 - 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-μm CMOS process. The test results show the improved image quality than digital gamma correction.
AB - 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-μm CMOS process. The test results show the improved image quality than digital gamma correction.
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M3 - Conference contribution
AN - SCOPUS:34547332842
SN - 0780393902
SN - 9780780393905
T3 - Proceedings - IEEE International Symposium on Circuits and Systems
SP - 3578
EP - 3581
BT - ISCAS 2006
T2 - ISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems
Y2 - 21 May 2006 through 24 May 2006
ER -