Patent ID: 7295238

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 using a gain-correcting value between the pixel data items for different channels, read by the image sensor; plural-line gain correcting means for multiplying a one-channel component by the gain-correcting value; and one-line gain detecting/correcting means for receiving an output from the plural-line gain correcting means and extracting pixels at a border between a first channel and a second channel then detecting and correcting the gain difference between the pixels at the border between the first and second channel on every line.