Low intensity contouring and color shift reduction using dither

Details Low intensity contouring and color shift reduction using dither Low intensity contouring and color shift reduction using dither

1996-10-11

2000-03-21

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348612, 348618, 348574, 348627, H04N 521

Patent

active

060408766

ABSTRACT:
A method and system for reducing the effects of false contouring and reducing color shading artifacts. An image signal 102 is dithered by the addition of a small noise signal from a noise generator 500. The added noise signal breaks up the edges of homogenous blocks of pixels, causing the created image to appear to have a smooth transition from one region to the next. The image dithering is especially useful in digital color image displays where processing performed on the chrominance portion of the image signal often causes quantization errors which lead to sharp transitions between similar shades when the input image included a smooth transition.

REFERENCES:
patent: 4959730 (1990-09-01), Tai et al.
patent: 5083210 (1992-01-01), Reilly et al.
patent: 5404176 (1995-04-01), Lum
patent: 5525984 (1996-06-01), Bunker
patent: 5557429 (1996-09-01), Hirose
patent: 5598482 (1997-01-01), Balasubramanian et al.

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