Title:
符号化方法、及び符号化装置
Document Type and Number:
Japanese Patent JP4158993
Kind Code:
B1
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 an 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:
Shino Kakuno
Toshishi Kondo
Hakai Makoto
Kiyoshi Abe
Toshishi Kondo
Hakai Makoto
Kiyoshi Abe
Application Number:
JP2008109894A
Publication Date:
October 01, 2008
Filing Date:
April 21, 2008
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
H03M7/42; H04N19/31; G06T9/00; G11B20/14; H03M5/14; H03M7/40; 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
Domestic Patent References:
| JP2000341694A | ||||
| JP9294268A | ||||
| JP3285460A | ||||
| JP7143488A | ||||
| JP10271017A |
Attorney, Agent or Firm:
Kenichi Hayase