Abstract
A CMOS image sensor integrating gamma correction and gain control functions is presented. The proposed method is based on a fact that gain variation and level shifting in logarithmic compressed domain are equivalent to the gamma correction and the gain control, respectively, in the exponentially expanded domain. The proposed circuits are simulated using 0.6μm CMOS parameters. As a result, the gamma value is adjusted to 0.45 when the gain given in the logarithmic compressed domain is 0.55,and a gain of 20dB is obtained by the voltage level shift of 60mV.
