Patent ID: 8451350

Claim:
A solid-state imaging device comprising: a pixel unit in which a photoelectric conversion element and a detection portion for converting a signal charge from the photoelectric conversion element into a voltage are arranged in a 2-dimensional direction; an A/D conversion circuit that converts a signal read from the pixel unit into a digital signal; and a signal processing circuit that carries out operational processing of the digital signal obtained by the A/D conversion circuit, wherein the pixel unit includes: an effective pixel portion that generates an effective pixel signal depending on a light amount incident to the photoelectric conversion element, and an optical black portion that generates a black level signal representing a lowest gradation level by optically shielding the photoelectric conversion element, wherein the optical black portion includes: a first optical black portion arranged in parallel with the effective pixel portion in a column direction to generate a first black level signal, a second optical black portion arranged in parallel with the effective pixel portion in a row direction to generate a second black level signal, and a third optical black portion arranged in parallel with the first optical black portion in a row direction and arranged in parallel with the second optical black portion in a column direction to generate a third black level signal, wherein the signal processing circuit includes: a vertical line correction circuit that carries out arithmetic averaging of the first black level signal for each column and adds/subtracts a result of the arithmetic averaging to/from the effective pixel signal, and a horizontal line correction circuit that carries out arithmetic averaging of the second black level signal for each row and adds/subtracts a result of the arithmetic averaging to/from the effective pixel signal, and wherein at least one of the vertical line correction circuit and the horizontal line correction circuit adds/subtracts the arithmetic average of the third black level signal to/from the first or second black level signal.