Patent ID: 6828563
Filing Date: 2004-12-07
Classification: H04N

Abstract:
A method for temperature compensation of sensitivity of an image including photosensitive spots each with a photodiode, the photodiodes being connected to read circuits, wherein the photosensitive spots are divided into detecting photosensitive spots, configured to detect an image when they are exposed to information carrying the image and are sensitive to this information, and into blind spots protected from the information, comprising:when the photosensitive spots are taken to a reference temperature, calculating a first average leakage current in the photodiodes of the blind photosensitive spots and generating a first average from signals delivered by the blind photosensitive spots during a first read operation; when the photosensitive spots are taken to an ambient temperature to be determined, generating a second average from signals delivered by the blind photosensitive spots during a second read operation; calculating the ambient temperature from the average leakage current and from a difference between the first and second averages; generating a gain image or a quasi gain image matched to the ambient temperature; and correcting an image recorded at the ambient temperature with the gain image or the quasi gain image.