Patent ID: 8441560

Claim:
An image capturing apparatus comprising: an image sensor including a first reference pixel for black level, a second reference pixel for black level different from the first reference pixel for black level, and an effective pixel; and a processing unit which applies first processing to an output signal from the effective pixel based on an output signal from the first reference pixel for black level, and applies second processing to an output signal from the effective pixel based on an output signal from the second reference pixel for black level, wherein the first reference pixel for black level and the second reference pixel for black level each include a charge-voltage converter which converts electric charge into a voltage and a pixel amplifier which amplifies a voltage of the charge-voltage converter, and the pixel amplifier of the first reference pixel for black level and the pixel amplifier of the second reference pixel for black level each include at least one transistor a gate of which is connected to each charge-voltage converter to constitute a source-follower circuit, and the first reference pixel for black level differs from the second reference pixel for black level in at least one of a gate width and a gate length of the transistor of the pixel amplifier.