Defective pixel detecting circuit of a solid state image pick-up

Details Defective pixel detecting circuit of a solid state image pick-up Defective pixel detecting circuit of a solid state image pick-up

1998-09-16

1999-12-14

Ho, Tuan

Television

Camera, system and detail

Combined image signal generator and general image signal...

348363, H04N 964

Patent

active

06002433&

ABSTRACT:
Image pick-up device reads image pick-up signals of all the pixels of CCD only when a light intercepting plate is moved from the light non-intercepting position to the light intercepting position for the first time after a battery replacement. By comparing the image pick-up signal from each pixel with a first threshold value, a possibly defective pixels are extracted. Thereafter, by reading the image pick-up signals for a prescribed number of times from CCD, accumulated value of the image pick-up signals of each of the possibly defective pixels is calculated. Based on the result of comparison between the accumulated value corresponding to each of the possibly defective pixels and second threshold value, an actually defective pixel is specified from the possibly defective pixels.

REFERENCES:
patent: 4893185 (1990-01-01), Fukushimna et al.
patent: 5047861 (1991-09-01), Houchin et al.
patent: 5625413 (1997-04-01), Katoh et al.
K.A. Bushaw et al., "Bad Pel Detection and Correction", IBM Technical Disclosure Bulletin, vol. 24, No. 11B, Apr. 1982, pp. 5898-5899.

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