Imaging device utilizing a line-crawling correction coefficient

Details Imaging device utilizing a line-crawling correction coefficient Imaging device utilizing a line-crawling correction coefficient

1997-02-03

2000-03-07

Garber, Wendy

Television

Camera, system and detail

Combined image signal generator and general image signal...

348247, 348607, 348615, H04N 5217

Patent

active

060347244

ABSTRACT:
A method and an apparatus are provided for eliminating a line-crawling phenomenon caused by nonuniformity in photosensitive characteristics of light-receiving pixels disposed in a color imaging device. A pixel signal (S) output from a color imaging device (2) is converted by a sample-and-hold circuit (4) and an A/D converter (6) into pixel data (P) so as to be stored in an image memory (8). An arithmetic unit (12) multiplies luminance data formed on the basis of each pixel data (P) by a line-crawling correction coefficient (LC) stored in a nonvolatile memory (10), for example, so as to form and output luminance data (V) which is substantially equivalent to that obtained when the light-receiving pixels have a uniform photosensitive characteristic. The line-crawling correction coefficient (LC) has been determined beforehand. Namely, light-receiving pixels having photosensitive characteristics substantially identical to each other are grouped, the arithmetic mean value of signals of the respective pixels in each group is determined, and the ratio between the arithmetic mean values of the respective groups is defined as the line-crawling correction coefficient (LC).

REFERENCES:
patent: 4450475 (1984-05-01), Ishikawa et al.
patent: 5268758 (1993-12-01), Nakayama et al.
patent: 5359369 (1994-10-01), Izawa et al.
patent: 5541648 (1996-07-01), Udagawa et al.
patent: 5719624 (1998-02-01), Sasaki et al.
patent: 5754227 (1998-05-01), Fukuoka

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