Patent ID: 7880790

Claim:
An image-signal processing apparatus for processing the signals output from an image sensor that reads pixel data for one screen, line by line, divides the pixel data into a plurality of channels and outputs the pixel data thus divided, said apparatus comprising: black-level correcting means for detecting the black level of the pixel data item for each channel, read from the image sensor, and for correcting the black level of the pixel data item for each channel; gain correcting means for detecting and correcting the gain difference between the pixel data items between any two adjacent channels selected from the plurality of channels, read by the image sensor; plural-line gain correcting means for multiplying one of the two adjacent channels by a gain-correcting value to create a gain-corrected channel; one-line gain detecting/correcting means for receiving an output from the plural-line gain correcting means and extracting pixels at a border between the gain-corrected channel and the remaining adjacent channel then detecting and correcting the gain difference between the pixels at the border between the gain-corrected channel and the remaining adjacent channel on every line; and output means for outputting the gain-corrected pixels for each line.