EP0584840A2
Expired / Lapsed
EP
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Apparatus for adaptive interframe predictive decoding of a video signal
Assignee: Victor Company of Japan Ltd
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Filing: 1990-04-27
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Granted: —
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Expires: 2010-04-27
Abstract
Abstract An apparatus for adaptive inter-frame predictive decoding of a video signal which comprises a plurality of spaced-apart reference frames and dependent frames located therebetween and encoded as a function of the immediately preceding and succeeding reference frame. A prediction mode signal is also transmitted and used on decoding to recreate the dependent frames as a function of the adjacent reference frames.
Inventors
- 👤 Kenji Sugiyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 20:00
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/90; H04N19/50; H04N19/503; H04N19/51; H04N19/573; H04N19/577; H04N19/587; H04N19/60; H04N19/61; H04N19/80; H04N19/82
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
212 words
An adaptive decoding apparatus for decoding video signals that have been encoded in an encoding apparatus by arranging said video signal into spaced-apart reference frames and dependent frames located therebetween; said reference frames being output from said encoder in encoded form and used therein to implement one of a plurality of prediction modes for adaptively predicting the display information in each of said dependent frames based on the degree of correlation between each dependent frame and the reference frames which immediately precede and succeed said dependent frame; said encoder thereby generating and outputting therefrom an encoded frame signal for each dependent frame and a prediction mode signal for identifying the prediction mode used to generate said encoded frame signal, said adaptive decoding apparatus comprising: decoding means for receiving and decoding each of the encoded reference frames, and the frame signals and the prediction mode signal associated with each dependent frame; processing means responsive to said prediction mode signal for reconstructing the display information for said dependent frame from its respective decoded frame signal and the reference frames which precede and succeed said dependent frame; and means for outputting the decoded reference frames and the reconstructed display information generated for each of said dependent frames in proper sequence to produce a video signal.
Claim 2
Dependent Claim
67 words
An apparatus according to claim 1, wherein said processing means includes memory means for storing the two decoded reference frames which respectively precede and succeed each dependent frame; and means responsive to the prediction mode signal associated with said dependent frame for generating and combining weighted values of said display information from said two decoded reference frames to reconstruct the predicted display information for said dependent frame.
Claim 3
Dependent Claim
40 words
An apparatus according to claim 2, further comprising means for combining said predicted display information for said dependent frame with said decoded frame signal of said dependent frame to produce an output representing the display information for said dependent frame.
Claim 4
Dependent Claim
47 words
An apparatus according to claim 2 or 3, wherein said weighted values are generated by multiplying said display information in the preceding reference frame by a first weighting coefficient (W) and said display information in the succeeding reference frame by a second weighting coefficient (1 - W).
Claim 5
Dependent Claim
25 words
An apparatus according to claim 4, wherein, in response to a first prediction mode signal, the first and second weighting coefficients are each made non-zero.
Claim 6
Dependent Claim
42 words
An apparatus according to claim 5, wherein said weighting coefficients are selected such that one of said two reference frames which is temporally closer to said dependent frame is given a greater weight than the other one of said two reference frames.
Claim 7
Dependent Claim
22 words
An apparatus according to claim 4,wherein, in response to a second prediction mode signal, said second weighting coefficient is made effectively zero.
Claim 8
Dependent Claim
23 words
An apparatus according to claim 4, wherein, in response to a third prediction mode signal, said first weighting coefficient is made effectively zero.
Claim 9
Dependent Claim
35 words
An apparatus according to claim 4, further comprising means, responsive to a fourth prediction mode signal, for outputting the decoded frame signal of said dependent frame to represent the display information of said dependent frame.
References Cited (Backward Citations)
US4651207A
Cited
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