Patent ID: 6522788
Filing Date: 2003-02-18
Classification: H04N

Abstract:
Imaging apparatus comprising:a detector constituted by a two-dimensional matrix of opto-electronic sensors; means for correcting output signals of the sensors of said detector in order to compensate for differences between response characteristics of various ones of said sensors by applying a stored gain and an offset to an output of each of said sensors; means for temporarily interposing an optical plate on an inlet light beam originating from an observed scene and directed towards the detector, said optical plate being sufficiently diffusing to make an illumination received from the observed scene uniform over all of the sensors; means for deducing values of said offsets from the output signals of the sensors when receiving the uniform illumination and from the stored gains; and means for applying the stored gain values and the values of said offsets to the output signals of said sensors when observing the scene without said optical plate.