Patent ID: 6249312
Filing Date: 2001-06-19
Classification: H04N

Abstract:
A video camera comprising:a detector having a two-dimensional matrix of photosensitive sites apt to accumulate charges, distributed at a determined spacing, placed in an image plane of an optical system, and connected to a circuit for periodically transferring the accumulated charges at a determined frequency;a deviation member interposed on the light path between an entrance pupil and the matrix for deflecting said path in all directions about a nominal direction;a control unit for periodically controlling the deviation member, for causing deviations of the light path in two mutually orthogonal directions, each time for moving an image formed on the detector through a fraction of said spacing and combining said deviations for implementing a first determined cycle performing spatial oversampling in said two directions and combining said first cycle with a second cycle, causing a deviation of the image, each time through a complete said spacing, second cycle having a duration which is a multiple of the first cycle; anda processor unit arranged for calculating gain differences and response offsets between different ones of said sites by comparing the responses of at least two sites exposed successively to a same point of a scene due to said second cycle, for providing data enabling said differences and offsets to be compensated, and for providing an output image having a spatial resolution increased in reverse proportion of said fraction; andvibration detectors providing the control unit with signals responsive to angular movements about two directions orthogonal to the light beam passing through the inlet optical system,said control unit being further arranged to control said deviation member so as to compensate for vibration of the camera.