Patent ID: 8619164

Claim:
A method of restoring a pixel value associated with a bad pixel site in a first frequency band in a photo-detector that detects in at least a first and a second frequency band at each pixel site, the method comprising: locating the bad pixel site for the first frequency band; identifying, from among pixel sites adjacent to the bad pixel site, a pixel site having the highest value in the second frequency band; calculating a first band ratio between said first frequency band and said second frequency band for said identified pixel site; and restoring, as the pixel value of the bad pixel site in the first frequency band, a pixel value first obtained by multiplying the value of the bad pixel site in the second frequency band by the calculated band ratio or its inverse; wherein the point-spreads of said first frequency band and said second frequency band are similar and at least part of the point-spread of the bad pixel site falls onto surrounding pixel sites.