Patent ID: 7755680

Claim:
An image signal processor for processing a plurality of image signals associated with a plurality of screens, comprising: an image memory circuit for storing a signal corresponding to a target pixel and signals corresponding to a plurality of peripheral pixels adjacent to the target pixel; a deficiency candidate detection circuit for comparing the signal corresponding to the target pixel with a threshold value calculated from the signals corresponding to the plurality of peripheral pixels to detect a deficient pixel candidate, and for generating a comparison result; a deficiency determining circuit for determining a deficient pixel according to a continuity of the deficient pixel candidate based on a plurality of comparison results over the plurality of screens; a position memory circuit for storing deficiency information of a position of the deficient pixel determined by the deficiency determining circuit; and a deficiency correction circuit for correcting the signal corresponding to the target pixel, which is deficient, in accordance with the deficiency information; wherein the deficiency determining circuit is configured to receive image pickup control information from an image pickup device for producing an image signal and is configured to determine a deficient pixel by using the image pickup control information and the threshold value.