Defect compensator for solid-state image pickup device

Details Defect compensator for solid-state image pickup device Defect compensator for solid-state image pickup device

1996-07-18

1999-11-30

Lee, Thomas D.

Image analysis

Image enhancement or restoration

Edge or contour enhancement

358474, 358483, 348246, 348250, G06K 940, H04N 104

Patent

active

059956755

ABSTRACT:
A defect compensator for a solid-state image pickup device includes a vertical charge coupled device (VCCD) region for transferring signal charges produced by a plurality of optical detectors which detects an image signal of incident light, in the vertical direction, a buffer for storing a pixel data in the VCCD region by means of a plurality of scanning lines unit sequentially, a defect detecting and compensating part having a plurality of matrix shaped sub-windows which calculate sum value of peripheral pixels except a central pixel upon receipt of the pixel data of the buffer, a plurality of sum-windows which divide sum value calculated by the corresponding sub-windows into a plurality of blocks to calculate their average value, a defect determining part which determines the presence of the defect upon comparing the average value with the central pixel value, and a compensation pixel value determining part which determines a defect compensation value upon comparing an arbitrary peripheral pixel value from the corresponding sub-windows with the average value calculated by the corresponding sum-windows, and a multiplexer for selectively outputting either a pixel data in which the defect compensation has been completed in accordance with an output signal of the defect determining part or a pixel data in which the defect has not been compensated.

REFERENCES:
patent: 4894721 (1990-01-01), Matsuda
patent: 5327246 (1994-07-01), Suzuki
patent: 5329381 (1994-07-01), Payne
patent: 5331420 (1994-07-01), Yamano et al.
patent: 5381175 (1995-01-01), Sudo et al.

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