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EP0712252A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Moving image encoding and decoding device

Assignee: NTT Docomo Inc
•
Filing: 1995-05-26
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Granted: —
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Expires: 2015-05-26
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Abstract

Abstract A moving image encoding and decoding device which can efficiently refresh an image and can correct image deterioration caused by a code error in a short time. The encoding and decoding device is provided with a region shape measuring means (12) which measures the shape of a motion compensating region by discriminating the motion compensating area from the other region in an image of one frame and a motion direction estimating means (14) which estimates the motion direction based on the estimated starting point of the motion direction in the motion compensation region. Refreshing operation is performed in the estimated motion direction from the estimated starting point of the estimated motion direction in the motion compensating region. In case a code error occurs in a block, a code error block number reporting means (13) reports the block number and a refresh starting point is the block, out of the block the number of which is reported and the adjacent blocks, positioned in the opposite direction to the estimated motion direction.

Inventors

  • 👤 Masahito Saigusa
  • 👤 Toshio Miki

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 21:17
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/85; H04N19/89; H04N19/895; H04N19/10; H04N19/102; H04N19/103; H04N19/107; H04N19/134; H04N19/136; H04N19/137; H04N19/139; H04N19/169; H04N19/17; H04N19/176; H04N19/50; H04N19/503; H04N19/51; H04N19/527; H04N19/60; H04N19/61

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 139 words
A video coding decoding apparatus in which a picture in a single frame is divided into blocks of M x N (where M and N are natural numbers) and in which an interframe motion compensation prediction is carried out, said video coding decoding apparatus comprising: area shape detecting means for dividing the picture in a single frame into a motion compensation area and the remaining area and then detecting a shape of said motion compensation area by distinguishing between said motion compensation area and said the remaining area; motion vector estimating means for estimating a motion vector of the overall motion compensation area from a motion vector in said motion compensation area; and refreshing means for carrying out a refreshing operation from a starting point of the estimated motion vector toward the motion vector, in said motion compensation area.
Claim 2
Dependent Claim 32 words
A video coding decoding apparatus according to claim 1, further comprising a refreshing range control means for limiting a range of the refreshing operation to a range of said motion compensation area.
Claim 3
Dependent Claim 69 words
A video coding decoding apparatus according to claim 1, wherein: said motion vector estimating means estimates a motion vector of the overall motion compensation area by combining motion vectors of the respective blocks belonging to said motion compensation area, and said refreshing means refreshes each block belonging to said motion compensation area for each frame from the starting point of the estimated motion vector toward the estimated motion vector.
Claim 4
Dependent Claim 73 words
A video coding decoding apparatus according to claim 1, further comprising: code error block number informing means for informing a number of a block in which a code error has occurred; a block which, among many other adjacent blocks to that block which is informed by said block number informing means, located in an opposite direction with respect to the estimated motion vector, being served as a starting point for the refreshing operation.
Claim 5
Dependent Claim 35 words
A video coding decoding apparatus according to claim 4, further comprising: refreshing range control means for limiting a range of the refreshing operation to a range of blocks which belong to said motion compensation area.

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