Spectrally selective dithering and color filter mask for increas

Details Spectrally selective dithering and color filter mask for increas Spectrally selective dithering and color filter mask for increas

1990-11-26

1992-02-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358 44, G01J 350

Patent

active

050878093

ABSTRACT:
An improved method of operating a color scanning system of the type that incorporates a monochrome image sensor having at least one photosensitive area that is sequentially exposed to individual colors of a scene and to a dithering of the scene with respect to the image sensor photosensitive area is described along with an improved color filter mask for the at least one photosensitive area. The blue filter mask is formed over a portion the photosensitive area, for example, an L-shaped portion, that covers approximately 75% of the photosensitive area. The method of operation is to first image and dither a red filtered version of the scene onto the photosensitive area to generatr a red image signal. Next a green filtered version of the scene is imaged and dithered onto the photosensitive area to generate a green image signal, and lastly a blue filtered version of the scene is imaged onto the photosensitive area without dithering to generate a blue image signal. The photosensitive area generates an electrical signal from it's full area in this mode, because the blue masking material is transparent to the blue image.

REFERENCES:
patent: 4355087 (1982-10-01), Martin
patent: 4395629 (1983-07-01), Sasano et al.
patent: 4481530 (1984-11-01), Wagesonner et al.
patent: 4547074 (1985-10-01), Hinoda et al.
patent: 4710803 (1987-12-01), Suzuki et al.
patent: 4827118 (1989-05-01), Shibata et al.
patent: 4965449 (1990-10-01), Suzuki et al.

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