公开(公告)号：EP1665133A4

公开(公告)日：2009-05-13

申请号：EP05711937

申请日：2005-01-19

Applicant: PANASONIC CORP

Inventor： KADONO SHINYA ,  KASHIWAGI YOSHIICHIRO ,  LU JIUHUAI ,  LIM CHONG SOON ,  TAO CHEN

IPC: G06K9/36 ,  G06K9/46 ,  H04N7/12 ,  H04N7/26 ,  H04N7/50 ,  H04N11/02 ,  H04N11/04

CPC classification number: H04N19/136 ,  H04N19/126 ,  H04N19/176 ,  H04N19/196 ,  H04N19/463 ,  H04N19/61 ,  H04N19/91

Abstract: The picture coding method according to the present invention is a picture coding method for coding a picture on a block-by-block basis through orthogonal transformation (Fig. 3, T) and quantization (Fig. 3, Q), and coding a quantization matrix (Fig. 2) that is used to derive quantization steps for frequencies of orthogonal transformation coefficients, the method comprising: calculating a difference value between each of frequency components included in the quantization matrix (Fig. 2) and a predetermined value corresponding to said each of the frequency components; and coding the difference value into a variable length code (Fig. 3, VLC), wherein a code length of the variable length code is shorter as the difference value is smaller, or equal to a code length of a neighboring difference value of said difference value (Fig. 4).