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US 2005/0089231 A1Published application
Fast image decompression via look up table
AssigneeSharp Laboratories of America, Inc.
InventorLouis Kerofsky
Life of this patent
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Abstract
A system to decode compressed digital images decodes frequently occurring variable length symbols encoding a compressed image by selecting a corresponding quantized pixel value for inverse quantization from a table relating code symbols and precalculated quantized pixel values.
Claims14
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A decoder for decompressing a compressed image comprising:
- (a) variable length symbol decoder to identify a quantization index corresponding to a variable length symbol encoding said compressed image;
- (b) an inverse transformer to convert said quantization index to a quantized pixel value;
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- (c) an inverse quantizer to convert said quantized pixel value to a pixel value for a decompressed image.
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A decoder for reconstructing a compressed image comprising:
- (a) a decode mode selector selecting a first decoder if a number of bits included in a symbol encoding said compressed image is less than a threshold number of bits and otherwise selecting a second decoder;
- (b) said first decoder;
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- (c) said second decoder.
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Dependencies are inferred from the claim text.