Patent ID: 7719724

Claim:
A black-level feedback device that executes a black-level feedback control that includes converging a black detection level to a black-level target value, based on a black differential value between the black detection level obtained by averaging assigned pixels of image data in one line output from a photoelectric conversion element during a black-level period or a period corresponding to a black level and the black-level target value determined in advance, the black-level feedback device comprising: a first set-value calculating unit that calculates and outputs a first set value of a black-level feedback based on a reflection amount that increases a speed of tracking to the black-level target value in the black-level feedback control; a second set-value calculating unit that calculates and outputs a second set value of a black-level feedback based on a reflection amount that slows down a speed of tracking to the black-level target value as compared to the speed of tracking of the first set-value calculating unit; a selecting unit that selects any one of the first set value and the second set value and outputs selected value as a set value; and a controlling unit that controls selection of any one of the first set value and the second set value by the selecting unit based on the black differential value and a gain of the image data, wherein the controlling unit causes the second set-value calculating unit to slow down the tracking of the image level variation due to a spread spectrum clock generator (SSCG), and causes the first set-value calculating unit to speed-up the tracking the image level variation due to smear when controlling the selection by the selecting unit.