Method and apparatus for image compression and decompression
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United States of America Patent
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Dec 16, 2008
Grant Date -
Jun 1, 2006
app pub date -
Nov 26, 2004
filing date -
Nov 26, 2004
priority date (Note) -
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Abstract
An image compression method for compressing groups of pixel data, including the following steps: MSB portions and LSB portions of the pixel data are compressed separately. Further, the LSB portions are grouped according to their associated MSB portions so that similar pixels are compressed together to gain higher a compression ratio. Some LSB portions are truncated to ensure a compression ratio. When performing compression, enhanced variable-length coding is adopted that predicts more accurate dividers by considering weighted combination of adjacent pixels. The quotient of each groups of compression portion is predicted and coded accordingly.
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