Image coding and decoding system using variable length coding and variable length decoding
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United States of America Patent
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Jan 27, 2015
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app pub date -
Nov 4, 2013
filing date -
Nov 22, 2001
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Abstract
An image coding apparatus provides a run-length encoding unit RLE1 that subjects quantized coefficients obtained by quantizing frequency components of an image signal to a variable length coding process by using a run value Run that indicates the number of successive zero coefficients and a level value Lev that indicates a value of a non-zero coefficient following the zero coefficients. The run-length encoding unit RLE1 includes a reordering unit Lreodr for reordering level values Lev; a variable length coder LVLC for coding reordered level values ROLev by using a code table selected according to the value of a quantization parameter QP; a reordering unit Rreodr for reordering run values Run from high frequency component of the quantized coefficients to low frequency component; and a variable length coder RVLC for coding reordered run values RORun by using a code table selected according to the number of already-processed run values.
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