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US 2002/0164081 A1Published application
Image compression
AssigneeTexas Instruments Incorporated
InventorMinhua Zhou
Life of this patent
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Abstract
A method of image/video compression by analysis of variability of block DCT AC coefficients to decide on treatment as a zero block. Separate image and motion compensation methods.
Claims3
A method of image compression, comprising:
- (a) transform a block of pixel values to a set of coefficients;
- (b) comparing a measure of a subset of the set of coefficients to a threshold, and when the measure is less than the threshold, treating the subset as zero coefficients.
An image compressor, comprising:
- (a) a DCT transformer;
- (b) a comparator coupled to said transformer and operable to compare a measure of a subset of the set of DCT coefficients from said DCT transformer to a threshold;
- and
- (c) a compressor coupled to the output of said DCT transformer and to said comparator, and when the comparator indicates said measure is less than said threshold, the compressor is operable to treat the subset as zero coefficients.
1 more element
Dependencies are inferred from the claim text.