| 摘要 |
PROBLEM TO BE SOLVED: To provide a CMOS image sensor capable of improving overall image quality by applying a gamma correction to image data outputted from pixels while performing an analog/digital conversion by operating a ramp signal. SOLUTION: The CMOS image sensor comprises an image capture means to convert incident light from an article to a light receiving region, an analog/ digital conversion means 100 to convert an analog image signal to a digital signal and a ramp signal generator 120 having a plurality of capacitors, a plurality of switches, an amplifier, connected to the plurality of capacitors and switches, to receive a gain and a reset voltage from the outside and a capacitor control means connected in parallel to not less than one capacitor of the ramp signal generator 120 connected in parallel to correct the ramp signal for an analog gamma correction.
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