Patent ID: 7889260

Claim:
An image signal processing circuit for executing signal processing for an output of an image pickup device, comprising: an image signal correction section configured to receive output signals corresponding to divisional regions of the image pickup device as inputs and execute a correction process for the received signals; said image signal correction section including a calculation section configured to acquire pixel values of boundary pixels including pixels positioned adjacent the boundary between first and second image regions corresponding to the divisional regions of the image pickup device, calculate a first pixel value sum total which is a sum value of pixel values of the boundary pixels in the first image region on lines and a correction second pixel value sum total which is a sum value of partly replaced pixel values of the boundary pixels in the second image region on the lines and calculate a correction pixel value sum total difference which is a difference value between the first pixel value sum total and the correction second pixel value sum total, and a correction section configured to execute comparison between the correction pixel value sum total difference calculated by said calculation section and a threshold value determined in advance, decide a correction mode for divisional region images in response to a result of the comparison and execute a pixel value correction process for the divisional region images in accordance with the decided correction mode, said calculation section carrying out the calculation process of the correction second pixel value sum total such that difference calculation between a boundary pixel value of a boundary pixel in the second image region and a boundary pixel value of a boundary pixel in the first image region is carried out in a unit of one line and, where the calculated pixel value difference is higher than a preset threshold value, the pixel value of the boundary pixel in the second image region is rewritten with the pixel value of the boundary pixel in the first image region.