Low dynamic range 3-channel color decompression

Details Low dynamic range 3-channel color decompression Low dynamic range 3-channel color decompression

2011-07-12

2011-07-12

Bali, Vikkram (Department: 2624)

Image analysis

Image compression or coding

Including details of decompression

C708S203000

Reexamination Certificate

active

07978921

ABSTRACT:
Systems and methods for representing low dynamic range data in compressed formats with a fixed size block allow low dynamic range data to be stored in less memory. The compressed formats use 8 bits per pixel to represent 24 bits of low dynamic range data for each pixel. The compressed format includes four or six endpoint values, a partition index that specifies a mask for each pair of the endpoint values, and an index for each pixel in the block. The indices are compressed to allow more bits for the endpoint values. Mode bits are included to distinguish between the different encodings and various blocks within a single compressed image may be encoded differently. Compressed low dynamic range values may be efficiently decompressed in hardware.

REFERENCES:
patent: 5534931 (1996-07-01), Kondo
patent: 6167086 (2000-12-01), Yu et al.
patent: 6539119 (2003-03-01), Kondo et al.
patent: 6694052 (2004-02-01), Matama

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