Signal processing device, imaging device, and signal processing method

An imaging device, comprising:

• a light receiving surface including a plurality of effective pixels;
• and
• a central processing unit (CPU) configured to:
• calculate a reliability value based on a number of specific effective pixels among the plurality of effective pixels, wherein an output value of each of the specific effective pixels is equal to or less than a threshold value;
• adjust an offset amount based on output values of the specific effective pixels and the calculated reliability value;
• and
• correct output values of the plurality of effective pixels based on the adjusted offset amount.

A signal processing method, comprising:

• by a processor:
• calculating a reliability value based on a number of specific effective pixels among a plurality of effective pixels, wherein
• the plurality of effective pixels is included in a part of a region of a light receiving surface of an image sensor, and
• an output value of each of the specific effective pixels is equal to or less than a threshold value;
• adjusting an offset amount based on output values of the specific effective pixels and the calculated reliability value;
• and
• correcting output values of the plurality of effective pixels based on the adjusted offset amount.

A signal processing device, comprising:

• a central processing unit (CPU) configured to:
• adjust a first offset amount based on output values of specific effective pixels of a plurality of effective pixels, wherein
• the plurality of effective pixels is included in a light receiving surface of an image sensor,
• an output value of each of the specific effective pixels is equal to or less than a threshold value,
• the light receiving surface includes an effective pixel region and an optical black region,
• the plurality of effective pixels is arranged in the effective pixel region, and
• in the optical black region, pixels at which incident light from outside is blocked are arranged;
• and
• correct output values of the plurality of effective pixels based on one of the first offset amount or a second offset amount, wherein
• the second offset amount is based on output values of the pixels included in the optical black region,
• the output values of the plurality of effective pixels are corrected based on the first offset amount, when the number of the specific effective pixels is one of equal to or larger than a first number,
• the output values of the plurality of effective pixels are corrected based on the second offset amount, when the number of the specific effective pixels is smaller than a second number, and
• the first number is greater than the second number.