Patent ID: 7385611
Filing Date: 2008-06-10
Classification: G06K,H04N

Abstract:
1. A method of decompressing texture data encoded in a block compression format, comprising: computing one common denominator for all texel components in an encoded compressed block of texture data based on a first texel value and a second texel value, wherein the first texel value includes at least a first texel component value and the second texel value includes at least a second texel component value; computing a numerator for a first texel component by scaling a difference between the first texel component value and the second texel component value by a power of two index that is based on an index, wherein: selecting a conversion factor from a fixed set of conversion factors based on the block compression format, the first texel component, and the one common denominator; scaling the numerator by the conversion factor to produce a decompressed value for the first texel component; and summing the scaled numerator with the base computed from the first texel value or from the second texel value to produce the decompressed value for the first texel component.