HIGH EFFICIENCY ENCODER FOR MOVING IMAGE DATA

Japanese Patent JP3169147

B2

PURPOSE: To improve an encoding efficiency by a few subtracting amounts by multiplexing movement-compensated inter-frame predicted sub-band coefficient data obtained by a compensation band dividing means by 1 or 0 weighting factor by a coefficient filter, and thereafter inputting the data to a subtracting means.
CONSTITUTION: Input picture data 1 are converted into in-frame sub-band coefficient data 3 by a DCT by each N×N block by a band dividing part 2. On the other hand, local picture data 17 of the previous frame stored in a frame memory 16 are inputted together with the data 1 to a movement detecting part 19, and the data are converted into movement compensated inter-frame sub-band coefficient data 21 by a dividing part 18 based on obtained movement vector 20. The data are compared with the data 21 by each bus-band by a coefficient discriminating part 22, an in-frame/inter- frame switching is operated so that a power in the block can be the minimum, and switching information 23 in outputted. Then, data 25 obtained by multiplying the data 21 by the 0 or 1 factor by a coefficient filter 24 based on the information 23 are subtracted from the data 3 by a subtractor 4, inter-frame difference data 5 are quantized by a quantizer 6, and video encoded data 9 are outputted through an encoding circuit 8.

Hironao Kisawa
Hiroshi Watanabe

JP23434892A

May 21, 2001

September 02, 1992

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Nippon Telegraph and Telephone Corporation

H03M7/30; G06T9/00; H04N19/102; H04N19/107; H04N19/117; H04N19/132; H04N19/136; H04N19/169; H04N19/176; H04N19/189; H04N19/196; H04N19/423; H04N19/46; H04N19/50; H04N19/503; H04N19/51; H04N19/60; H04N19/61; H04N19/625; H04N19/635; H04N19/70; H04N19/82; H04N19/91; (IPC1-7): H04N7/30

如澤裕尚、渡辺裕，“等分割サブバンド符号化における動き補償フレーム間予測の周波数領域実現”，電子情報通信学会技術研究報告，社団法人電子情報通信学会，平成３年１１月２２日，第９１巻，第３３６号，ｐ．９−１６（ＩＥ９１−８２）

Akio Namiki

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