Temporally dissolved dithering
AssigneeIntel Corporation
InventorRohit Agarwal
Life of this patent
Estimating the term…
Abstract
A set different dither matrices is employed in a repetitive manner to accomplish elimination of contouring while at the same time not adding typical "dither graininess" to a digital video image. The matrices are specially chosen to result in a time-averaged zero dithering bias when applied frame-by-frame in a long sequence of frames.
Claims20
In a digital video processing system, a method for dithering quantized color values having a given step size during a color conversion process, comprising the steps of:
- (A) adding a set of dither values to first color values throughout a first frame of digital video values;
- (B) adding a different set of dither values to second color values throughout a second frame of digital video values, said second frame being subsequent to said first frame in time sequence;
- and,
- (C) repeating steps (A) and (B) for subsequent frames in time order;
- wherein the time-averaged value of said dither values at a given pixel location is zero.
In a digital video processing system, apparatus for dithering quantized color values having a given step size during a color conversion process, comprising:
- (A) means for adding a set of dither values to first color values throughout a first frame of digital video values;
- (B) means for adding a different set of dither values to second color values throughout a second frame of digital video values, said second frame being subsequent to said first frame in time sequence;
- and,
- (C) means for repeating steps (A) and (B) for subsequent frames in time order;
- wherein the time-averaged value of said dither values at a given pixel location is zero.
Dependencies are inferred from the claim text.