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

A human eye has the logarithmic response over wide range of light intensity. Although the gain can be set high to Dout identify details in darker area on the image, this results in Dout saturation in brighter area. The gamma correction is essential to fit the human eye. However, the digital gamma correction (b) degrades image quality especially for darker area on the image due to the limited ADC resolution and the dynamic range. This (a) paper proposes a CMOS image sensor (CIS) with nonlinear analog-to-digital converter (ADC) which performs analog v V. gamma correction. The CIS with the proposed nonlinear ADC

• Type: Conference
• Year: 2006
• Where: ISCAS
• Authors: Seogheon Ham, Yonghee Lee, Wunki Jung, Seunghyun Lim, Kwisung Yoo, Youngcheol Chae, Jihyun Cho, Dongmyung Lee, Gunhee Han
• Keywords: Darker Area, Gamma Correction, Human Eye, ISCAS 2006