Patent ID: 7688367
Filing Date: 2010-03-30
Classification: H04N

Abstract:
1. An image signal processing apparatus comprising: an image sensing device that has an image signal area and an optical black area; an optical black level detection unit that measures an optical black level of a first image signal from an output of the optical black area in the first image signal, that represents a first image, output by said image sensing device; and an optical black correction unit that corrects an optical black level of a second image signal, that represents a second image, output from said image sensing device, the second image signal corresponding to pixels the number of which is larger than a number of pixels that the first image signal corresponds to, wherein the image sensing device generates the second image signal after generating the first image signal, and wherein the optical black correction unit calculates the optical black level to be used for correcting the second image signal from the optical black level of the first image signal measured by the optical black level detection unit based on at least one of shutter speed and sensitivity used when generating the second image signal, and performs optical black correction on the second image signal based on the calculated optical black level.