CCD camera defective pixel compensation using stored gain values

Details CCD camera defective pixel compensation using stored gain values CCD camera defective pixel compensation using stored gain values

1996-03-28

1999-07-06

Garber, Wendy

Television

Camera, system and detail

Combined image signal generator and general image signal...

348247, H04N 964

Patent

active

059203447

ABSTRACT:
A defect compensation circuit in a CCD camera for compensating for a defective pixel produced by the CCD camera, which uses digital signal processing, is provided. The apparatus includes a pixel delay for delaying an input pixel signal for one pixel, a subtracter for subtracting a non-delayed pixel signal from the pixel signal delayed by the pixel delay, a comparator for outputting a defect detection signal when the subtracted value generated by subtracter is greater than a value of a predetermined reference level and a compensator for selectively compensating for a defective pixel according to the defect detection signal output from the comparator. Accordingly, a detected defective pixel can be replaced with the value of the level of a previous pixel or can be controlled by selecting a gain constant, so that the camera produces excellent image quality regardless of generation of defective pixels.

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