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EP0518314A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Motion compensated predicting apparatus

Assignee: Mitsubishi Electric Corp
•
Filing: 1992-06-11
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Granted: —
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Expires: 2012-06-11
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Abstract

Abstract An MC predicting apparatus which ensures a high prediction accuracy against input image signal stream and avoids arithmetic operation of an evaluation function from becoming an overhead for an image encoding process is provided. Sequence numbers given to respective frames are discriminated, and a degree of interframe correlation is decided from a difference in sequence number of the preceding and current frames. A reference block generator adaptively controls, depending on the degree of interframe correlation, the reference range of MC prediction of the preceding frame stored in a frame memory. As a result, the number of times of arithmetic operation of an evaluation function for MC prediction can be reduced and a prediction accuracy can be improved.

Inventors

  • 👤 Kouichi c/o Mitsubishi Denki K.K. Tanaka

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-31 04:09
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/50; H04N19/503; H04N19/51; H04N19/56

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 136 words
An MC predicting apparatus comprising: a first means for outputting an input block by forming a block from a digital image signal stream within a frame; a second means for outputting a prediction error block by obtaining a difference between said input block and a prediction block selected from a reference block group including a plurality of prediction blocks located in the same position as or in the vicinity of the position of said input block; a third means for developing said prediction error block to encoded data; a fourth means for adding a sequence number to each frame; and a fifth means for causing said second means to adaptively control a reference range of said reference block group in accordance with interframe correlation corresponding to a difference in sequence number of current and preceding frames.
Claim 2
Dependent Claim 136 words
An MC predicting apparatus comprising: a first means for outputting an input block by forming a block from a digital image signal stream within a frame; a second means for outputting a prediction error block by obtaining a difference between said input block and a prediction block selected from a reference block group including a plurality of prediction blocks located in the same position as or in the vicinity of the position of said input block; a third means for developing said prediction error block to encoded data; a fourth means for adding a sequence number to each frame; and a fifth means for causing said second means to adaptively control a reference range of said reference block group in accordance with interframe correlation corresponding to a difference in sequence number of current and preceding frames.
Claim 3
Dependent Claim 33 words
An apparatus according to Claim 1, wherein said fifth means causes said second means to adaptively change the size of the reference range of said reference block group in accordance with interframe correlation.
Claim 4
Dependent Claim 81 words
An apparatus according to Claim 1, wherein said fifth means modifies a motion vector of the preceding frame in the same position as that of said input block in accordance with a difference between the sequence numbers of the current and preceding frames, causes said second means to correct the position of said input block using such a modification as an initial displacement, thereby correcting the position of said input block as the standard position of said plurality of prediction blocks.
Claim 5
Dependent Claim 45 words
An apparatus according to Claim 1, wherein said fifth means causes said second means to adaptively control the standard position and the reference range of said plurality of prediction blocks in accordance with a difference between the sequence numbers of the current and preceding frames.

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