SOLID-STATE IMAGE SENSOR AND SIGNAL PROCESSING METHOD OF SAME

摘要

A signal processing method of a solid-state image sensor includes comparing a high-sensitivity-pixel output signal and a first threshold value to determine whether or not the high-sensitivity-pixel output signal reaches a level of a saturated-high-sensitivity-pixel output signal. If the high-sensitivity-pixel output signal does not reach the level of the saturated-high-sensitivity-pixel output signal, a difference value between the high-sensitivity-pixel output signal and an amplified low-sensitivity-pixel output signal is calculated. The amplified low-sensitivity-pixel output signal is obtained by multiplying a low-sensitivity-pixel output signal by a sensitivity ratio, which is obtained by dividing a sensitivity value of a high sensitivity pixel by a sensitivity value of a low sensitivity pixel. A first or second image signal is output according to whether an absolute value of the difference value is smaller than a second threshold value or not.