MOVING IMAGE ENCODING DEVICE - Sharp Corporation

Title:

MOVING IMAGE ENCODING DEVICE

Document Type and Number:

Japanese Patent JP3604864

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To make a predicted structure variable through a simple arithmetic operation, and to further change the predicted structure precisely by adpatively varying a reference frame interval, and determining the reference frame interval according to the output of a prediction efficiency calculating circuit.
SOLUTION: In a prediction efficiency calculating circuit 12, prediction efficiency in an encoded frame is calculated from information outputted from a moving vector detecting circuit 3, and to be used by an encoding mode judging circuit 4. In a reference frame interval decision circuit 13, a reference frame interval is determined from the prediction efficiency calculated by a prediction efficiency calculating circuit 12 and an encoding mode determined by the encoding mode judging circuit 4, and a picture re-arrangement control circuit 2 is controlled. The picture re-arrangement control circuit 2 reads coded from a frame memory 1 in an order designated by the reference frame interval decision circuit 13. When an inter-frame prediction error is large, the time interval of the reference frame is reduced, and the prediction efficiency is improved resulting in the improvement of picture quality.

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Inventors:

Yoichi Fujiwara
Tadao Matsuura
Hiroshi Kusao

Application Number:

JP10868297A

Publication Date:

December 22, 2004

Filing Date:

April 25, 1997

Export Citation:

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Assignee:

Sharp Corporation

International Classes:

H04N19/50; G06T9/00; H03M7/36; H04N19/114; H04N19/134; H04N19/136; H04N19/137; H04N19/14; H04N19/142; H04N19/159; H04N19/172; H04N19/176; H04N19/196; H04N19/42; H04N19/423; H04N19/503; H04N19/51; H04N19/577; H04N19/85; (IPC1-7): H04N7/32

Domestic Patent References:

JP8046969A
JP5308628A
JP5095540A

Attorney, Agent or Firm:

Kuro Fukami
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai
Takaya Koike

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