Correction of defective adjacent pixels in image sensors

摘要

A digital filtering algorithm is disclosed which pre-processes couplet defects prior to their being operated on by a main filtering algorithm that focusses on singlet defects. The pre-processing invloves the replacement of one of the defective pixel values in the couplet with a pixel value that is known to be non-defective. In preferred embodiments, the selection of the pixel value in the couplet to be replaced is customised depending on the direction of scanning of the pixel array, and can take into account edge effects of border pixels