Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1994-06-10
1996-05-07
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214AG, 358474, H01L 2700
Patent
active
055148654
ABSTRACT:
A system for sensing images using a detector array and correcting errors in the image signals caused by gain and offset variations from detector to detector in the array is disclosed. To correct gain and offset errors, the detector array is dithered by moving the detector line of sight between consecutive frames according to a predetermined pattern. This dithering causes different detectors to image the same location in the scene during different frames, and causes two adjacent detectors to scan between the same two points in the scene during a cycle of the dither pattern. Image data generated from the dithering is used to remove gain and offset errors from the sensed images, and to generate gain and offset correction values to be stored in a table and applied to the sensed images. The system is also adapted to compensate for scene changes when the detector array is installed on a moving platform.
REFERENCES:
patent: 4707728 (1987-11-01), Hurst
patent: 4757389 (1989-07-01), Clark et al.
patent: 4760463 (1988-07-01), Nonoyama et al.
patent: 4902893 (1990-02-01), Burrer
patent: 5276319 (1994-01-01), Hepfer et al.
Edwards C. O.
Nichols Steven L.
Westin Edward P.
Westinghouse Electric Corp.
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