Fixed Length Coding Based Image Data Compression
AssigneeTexas Instruments Incorporated
InventorMinhua Zhou
Life of this patent
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Abstract
A method of compressing an image data block is provided that includes computing a pixel residual for each pixel in the image data block except a non-residual pixel, computing a compression level for the image data block based on a minimum pixel residual value and a maximum pixel residual value of the pixel residuals, encoding a compression flag for the image data block, wherein the compression flag includes an indicator identifying the compression level and a first portion of bits from the non-residual pixel, and generating a compressed block comprising a second portion of bits from the non-residual pixel and the pixel residuals encoded using fixed length coding based on the compression level.
Claims20
A method of compressing an image data block, the method comprising:
- computing a pixel residual for each pixel in the image data block except a non-residual pixel;
- computing a compression level for the image data block based on a minimum pixel residual value and a maximum pixel residual value of the pixel residuals;
- encoding a compression flag for the image data block, wherein the compression flag includes an indicator identifying the compression level and a first portion of bits from the non-residual pixel;
- and
- generating a compressed block comprising a second portion of bits from the non-residual pixel and the pixel residuals encoded using fixed length coding based on the compression level.
A digital system comprising:
- means for computing a pixel residual for each pixel in an image data block except a non-residual pixel;
- means for computing a compression level for the image data block based on a minimum pixel residual value and a maximum pixel residual value of the pixel residuals;
- means for encoding a compression flag for the image data block, wherein the compression flag includes an indicator identifying the compression level and a first portion of bits from the non-residual pixel;
- means for encoding the pixel residuals using fixed length coding based on the compression level;
- and
- means for generating a compressed block comprising a second portion of bits from the non-residual pixel and the pixel residuals encoded using fixed length coding based on the compression level.
Dependencies are inferred from the claim text.