Fractal-dithering technique for image display

Details Fractal-dithering technique for image display Fractal-dithering technique for image display

2007-04-17

2007-04-17

Zimmerman, Mark (Department: 2628)

Computer graphics processing and selective visual display system

Computer graphics processing

Attributes

C345S690000

Reexamination Certificate

active

10874796

ABSTRACT:
Rapid dithering of an RGB image from a higher order to a lower order number of bits is provided while introducing fewer undesirable artifacts than are visible in conventional dithering technology. A compact, deterministic method enables the elimination of banding, for example as is seen in 24-bit monitors when viewing color images with greater color depth. A fractal dithering engine selects a threshold matrix appropriate for an input stream, and using the threshold matrix, dithers images of the input stream to output images having a lower order number of color bits. In one embodiment, the threshold matrix is obtained by traversing 2-by-2 sub-regions of an N-by-N matrix according to a traversal pattern, and then applying a reverse binary function to the values in the original matrix to yield the threshold matrix. The threshold matrix preferably tessellates the pixel plane, subject to certain constraints.

REFERENCES:
patent: 5553200 (1996-09-01), Accad
patent: 5982989 (1999-11-01), Broddin et al.
patent: 6424431 (2002-07-01), Ulichney et al.

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