Extension of two-dimensional variable length coding for image compression
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United States of America Patent
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Jan 29, 2008
Grant Date -
Jun 14, 2007
app pub date -
Feb 15, 2007
filing date -
Jan 15, 2003
priority date (Note) -
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Abstract
A method and an apparatus to decode a bitstream that includes codewords formed by a method of encoding series of quantized coefficients of a transform of a block of image data. The encoding method includes forming events from the series of quantized transform coefficients, each event being a run of none or more zero-valued coefficients followed by a run of one of a predefined set of sequences, each sequence in the set being either a single coefficient of amplitude greater than one, or a sequence of 1's and 0's starting with a coefficient of amplitude 1. The encoding method includes forming a codeword for each formed event. The decoding includes decoding recognized events until all the coefficients in a series of quantized transform coefficients is formed.
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