EP0150935A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Inter-frame coding apparatus for video signal
Assignee: NEC Corp
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Filing: 1985-01-11
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Granted: —
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Expires: 2005-01-11
Abstract
Abstract An input video signal on line (1) is fed to a motion compensation inter-frame coder (5) which includes a motion detector and produces a motion vector on line (6b) and a prediction error on line (6a). A refresh timing circuit (2) causes purely spatial refreshing, e.g. by previous value difference coding, in a band of lines, which band shifts progressively through the frame. In order to avoid replication of errors by the refresh operation, an inhibit signal on line (4) causes the motion compensation to be prevented in the band of lines which has just been refreshed. The various signals are coded by a coder (9) for transmission to receiving decoders (11, 15). In a modification, the motion vector used in the coder (5) is not passed to the coder (9) for transmission. At the receiving end it is locally created in the decoder (15). Inhibition of motion detection is effected in the coder (5) by setting the motion vector to zero.
Inventors
- 👤 Junichi Ohki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 08:34
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/10; H04N19/102; H04N19/103; H04N19/107; G; G06; G06T; G06T7/00; G06T7/20; G06T7/223; H04N19/50; H04N19/503; H04N19/51; H04N19/60; H04N19/61; G06T2207/00; G06T2207/10; G06T2207/10016
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
A coding apparatus for an input video signal, comprising means (30) for detecting motion contained in the input video signal to deliver a motion vector; means (28, 29, 22, 23) responsive to motion vector for coding the input video signal in an inter-frame prediction coding manner; refresh means (22-25) for coding said input video signal by using a spatial correlation of the input video signal; control means (2, 3, 31) for alternatively switching the coding means and the refresh means to code the input video signal; and means (2, 4) for inhibiting the operation of the motion detecting means (30) for a predetermined period with respect to an area where a refresh operation has been completed.
Claim 2
Dependent Claim
116 words
A coding apparatus for an input video signal, comprising means (30) for detecting motion contained in the input video signal to deliver a motion vector; means (28, 29, 22, 23) responsive to motion vector for coding the input video signal in an inter-frame prediction coding manner; refresh means (22-25) for coding said input video signal by using a spatial correlation of the input video signal; control means (2, 3, 31) for alternatively switching the coding means and the refresh means to code the input video signal; and means (2, 4) for inhibiting the operation of the motion detecting means (30) for a predetermined period with respect to an area where a refresh operation has been completed.
Claim 3
Dependent Claim
154 words
A coding apparatus for a input video signal, comprising motion detection means (30) for delivering a motion vector by detecting motion contained in the input video signal, means (2, 4) for setting the motion vector to zero for a predetermined period in a portion where a refresh operation has been completed; means (29) for generating a prediction signal in response to a previously stored (28) video signal and the motion vector; first coding means (22, 23) for generating a prediction error signal by comparing the prediction signal and the input video signal; second coding means (24, 25) for generating a refresh signal by adding the prediction signal and the prediction error signal; means (2, 3, 31) for alternatively selecting the refresh signal when the refresh operation is completed or the prediction error signal; and means (9) for transmitting the output delivered from the selecting means and the motion vector and a refresh execution signal.
Claim 4
Dependent Claim
154 words
A coding apparatus for a input video signal, comprising motion detection means (30) for delivering a motion vector by detecting motion contained in the input video signal, means (2, 4) for setting the motion vector to zero for a predetermined period in a portion where a refresh operation has been completed; means (29) for generating a prediction signal in response to a previously stored (28) video signal and the motion vector; first coding means (22, 23) for generating a prediction error signal by comparing the prediction signal and the input video signal; second coding means (24, 25) for generating a refresh signal by adding the prediction signal and the prediction error signal; means (2, 3, 31) for alternatively selecting the refresh signal when the refresh operation is completed or the prediction error signal; and means (9) for transmitting the output delivered from the selecting means and the motion vector and a refresh execution signal.
Claim 5
Dependent Claim
117 words
A coding apparatus for an input video signal, comprising means (30) for detecting motion contained in the input video signal to deliver a motion vector; means (28, 29, 22, 23) for generating a prediction error signal in response to the motion vector and the input video signal, means (22-25) for generating a refresh signal when refresh operation is performed; means (2, 4) for producing a motion compensation inhibition signal for a predetermined period after the refresh operation has been performed; means (2, 3, 31) for alternatively selecting the prediction error signal and the refresh signal; and means (9) for transmitting the output delivered from the selecting means, the motion compensation inhibition signal and a refresh execution signal.
Claim 6
Dependent Claim
117 words
A coding apparatus for an input video signal, comprising means (30) for detecting motion contained in the input video signal to deliver a motion vector; means (28, 29, 22, 23) for generating a prediction error signal in response to the motion vector and the input video signal, means (22-25) for generating a refresh signal when refresh operation is performed; means (2, 4) for producing a motion compensation inhibition signal for a predetermined period after the refresh operation has been performed; means (2, 3, 31) for alternatively selecting the prediction error signal and the refresh signal; and means (9) for transmitting the output delivered from the selecting means, the motion compensation inhibition signal and a refresh execution signal.
References Cited (Backward Citations)
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