Title:
MOVING IMAGE ENCODING METHOD AND ITS DEVICE
Document Type and Number:
Japanese Patent JP3674535
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To increase compression efficiency in a moving image encoding method and device for prediction encoding between compensated frames.
SOLUTION: A forward moving vector derived in forward moving vector retrieval for a P frame to each B frame to which bidirectional movement between the compensated frame prediction encoding should be operated is distributed as a forward moving vector, by reducing the size according to a frame distance between each B frame and a reference frame (I or P frame). Also, reverse moving vector retrieval is operated by using the I or P frame as the reference frame for the next frame of the I or P frame in the B frames, and the derived reverse moving vector is distributed as the reverse moving vector by reducing the size according to the frame distance between each B frame and the reference frame (I or P frame). Then, the prediction encoding is operated between bidirectional movement compensated frames by using the forward moving vector and the backward moving vector.
Inventors:
Hiroyuki Ishikawa
Application Number:
JP2001137840A
Publication Date:
July 20, 2005
Filing Date:
May 08, 2001
Export Citation:
Assignee:
NEC
International Classes:
G06T9/00; H04N19/50; H03M7/36; H03M7/40; H04N19/105; H04N19/127; H04N19/134; H04N19/139; H04N19/159; H04N19/176; H04N19/196; H04N19/423; H04N19/503; H04N19/51; H04N19/513; H04N19/57; H04N19/577; H04N19/60; H04N19/61; H04N19/91; (IPC1-7): H04N7/32
Domestic Patent References:
| JP5236454A | ||||
| JP9284777A | ||||
| JP6217293A | ||||
| JP6197331A | ||||
| JP9182083A | ||||
| JP9121355A | ||||
| JP200145497A | ||||
| JP8191448A | ||||
| JP3226193A | ||||
| JP3220887A |
Other References:
Shinichi Kozu, Sanjeev Kulkarni,A new technique for block-based motion compensation,1994 IEEE International Conference on Acoustics, Speech, and Signal Processing, 1994. ICASSP-94.,1994年 4月,Vol.5,p.217-220
William E. Lynch,Bidirectional motion estimation based on P frame motion vectors and area overlap,IEEE International Conference on Acoustics, Speech, and Signal Processing, 1992. ICASSP-92.,1992年 3月,Vol.3,p.445-448
如澤 裕尚,MPEG-4ビデオ 動き補償と予測符号化,映像情報メディア学会誌,日本,1997年12月20日,第51巻、第12号,p.1976-1979
William E. Lynch,Bidirectional motion estimation based on P frame motion vectors and area overlap,IEEE International Conference on Acoustics, Speech, and Signal Processing, 1992. ICASSP-92.,1992年 3月,Vol.3,p.445-448
如澤 裕尚,MPEG-4ビデオ 動き補償と予測符号化,映像情報メディア学会誌,日本,1997年12月20日,第51巻、第12号,p.1976-1979
Attorney, Agent or Firm:
Takao Maruyama