Title:
VARIABLE LENGTH CODING METHOD AND VARIABLE LENGTH DECODING METHOD
Document Type and Number:
WIPO Patent Application WO2003045065
Kind Code:
A3
Abstract:
According to the present invention, an image coding apparatus provides a run-length encoding unit (RLE1) that 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 (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 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. Accordingly, a variable length coding process for quantized coefficients is carried out at a higher coding efficiency, with redundant information included in the coefficients being effectively reduced.
Inventors:
KADONO SHINYA (JP)
KONDO SATOSHI (JP)
HAGAI MAKOTO (JP)
ABE KIYOFUMI (JP)
KONDO SATOSHI (JP)
HAGAI MAKOTO (JP)
ABE KIYOFUMI (JP)
Application Number:
PCT/JP2002/012230
Publication Date:
February 19, 2004
Filing Date:
November 22, 2002
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
KADONO SHINYA (JP)
KONDO SATOSHI (JP)
HAGAI MAKOTO (JP)
ABE KIYOFUMI (JP)
KADONO SHINYA (JP)
KONDO SATOSHI (JP)
HAGAI MAKOTO (JP)
ABE KIYOFUMI (JP)
International Classes:
G06T9/00; H04N19/31; G11B20/14; H03M5/14; H03M7/40; H03M7/42; H03M7/46; H04N1/41; H04N7/50; H04N19/13; H04N19/134; H04N19/136; H04N19/176; H04N19/18; H04N19/189; H04N19/196; H04N19/60; H04N19/70; H04N19/91; H04N19/93; (IPC1-7): H04N7/30
Foreign References:
| US5995148A | 1999-11-30 | |||
| EP0987899A2 | 2000-03-22 |
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