Patent US5150818A successfully refreshed from Google Patents.
EP0444839A2
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Video signal transmission system and method and apparatus for coding a video signal
Assignee: Sony Corp
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Filing: 1991-02-25
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Granted: —
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Expires: 2011-02-25
Abstract
Abstract In a video signal transmission system, in which video signals are transformed to high efficiency coded data and are then transmitted, a quantization step size is enlarged in quantizing picture data intra coded to be effectively avoided the amount of data generated excessively increasing. The data residual amount of transmission buffer memory is set to a small level as compared to the data residual amount at which the frame dropping is completed. Video signals which are intra coded are then sent immediately after a transmission line is connected to a destination to be enhanced in facility. <IMAGE> <IMAGE>
Inventors
- 👤 Katsumi Tahara
- 👤 Seiichi Emoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 09:13
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/50; H04N19/587; H04N19/10; H04N19/102; H04N19/103; H04N19/112; H04N19/124; H04N19/126; H04N19/132; H04N19/134; H04N19/157; H04N19/159; H04N19/169; H04N19/17; H04N19/172; H04N19/176; H04N19/60; H04N19/61; H04N19/80; H04N19/82; H04N19/13; H04N19/146; H04N19/149; H04N19/15; H04N19/152; H04N19/90; H04N19/91
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
56 words
A video signal coding method in which video signals are alternatively intra and inter coded and are then quantized for transforming to picture data, characterized in that: the quantization is executed by enlarging the quantization step size to a predetermined rough quantization level when the picture data to be quantized is in an intra coded format.
Claim 2
Dependent Claim
108 words
A video signal coding system with a transmission buffer circuit, in which transmission picture data which has been high efficiency coded is temporarily stored in the transmission buffer circuit, and the transmission picture data stored is sequentially outputted to a transmission line according to a data transmission capacity of the transmission line, characterized in that: the transmission picture data is frame dropped when an amount of residual data of the transmission buffer circuit exceeds a predetermined upper limit; and the frame dropping operation is completed when the amount of the residual data of the transmission buffer circuit reduces to a predetermined desired level smaller than the upper limit.
Claim 3
Dependent Claim
168 words
A filter circuit comprising: a vertical digital filter circuit having a plurality of delay circuits connected in series, each delay circuit outputting picture data consecutive in the vertical scanning direction; a vertical selection circuit for selectively outputting the picture data outputted from the vertical digital filter circuit; a horizontal digital filter circuit having a plurality of delay circuits connected in series, each delay circuit outputting picture data consecutive in the horizontal scanning direction; and a horizontal selection circuit for selectively outputting the picture data outputted from the horizontal digital filter circuit; and wherein: picture data are sequentially inputted to the vertical digital filter circuit or the horizontal digital filter circuit; the output data of the vertical selection circuit or the horizontal selection circuit is fed to the horizontal digital filter circuit or the vertical digital filter circuit; the picture data outputted from the horizontal selection circuit or the vertical selection circuit is corrected by switching the selective outputs from the vertical selection circuit and the horizontal selection circuit.
Claim 4
Dependent Claim
13 words
A video signal processing apparatus including a filter circuit according to claim 3.
Claim 5
Dependent Claim
45 words
A video signal transmission system in which video signals are transmitted by repeating inter coding and intra coding at a predetermined cycle, characterized in that: the video signals of predetermined frames are intra coded and then transmitted after a line is connected to a destination.
Claim 6
Dependent Claim
88 words
A video signal coding method in which video signals are alternatively intra and inter coded and are then quantized for transforming to picture data, characterized in that: a power of said picture data is calculated when said picture data to be quantized is a data inter coded, and then said quantization is executed with a quantization step size which is reduced data a predetermined ratio to a quantization step size of a previous frame when said power of picture data calculated is smaller than a predetermined threshold value.
Claim 7
Dependent Claim
83 words
A video signal coding method in which video signals are alternatively intra and inter coded and are then quantized for transforming to picture data, characterized in that: a power of said picture data is calculated when said picture data to be quantized is a data inter coded, and then said quantization is executed with a quantization step size which is enlarged to a predetermined rough quantization step size value when said power of picture data calculated is larger than a predetermined threshold value.
References Cited (Backward Citations)
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