Variable length coding method and variable length decoding...

Details Variable length coding method and variable length decoding... Variable length coding method and variable length decoding...

2007-12-25

2007-12-25

Nguyen, Khai M. (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

C341S065000, C375S240220, C375S240230, C382S245000, C382S246000, C382S248000, C382S250000

Reexamination Certificate

active

11543854

ABSTRACT:
An image coding apparatus provides a run-length encoding unit RLE1that subjects quantized coefficients which are 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 RLE1includes 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 that is 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 that is selected according to the number of already-processed run values

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