US6285716B1
Expired / Lapsed
US
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Video compression
Assignee: British Broadcasting Corp
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Filing: 1996-12-16
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Granted: 2001-09-04
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Expires: 2016-12-16
Abstract
Abstract An MPEG-2 or other compressed video stream (CP) can be manipulated as separate information bus (IB) and coefficient (CP*) streams. The information bus stream (IB) contains motion vector information but also information derived from a previous decoding operation ( 14, 18 ) for use in a subsequent coding operation ( 22 ). Processing in the coefficient domain enables bit rate conversion without decoding to the pixel level and also simplifies the combination of MPEG layers.
Inventors
- 👤 Michael James Knee
- 👤 Bruce Fairbairn Devlin
- 👤 Nicholas Dominic Wells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:11
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/40; H04N19/10; H04N19/134; H04N19/142; H04N19/169; H04N19/179; H04N19/42; H04N19/46; H04N19/60; H04N19/61; H04N19/85; H04N19/87; H04N19/30; H04N19/39
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
115 words
A signal transmission chain comprising at least one video compression coder adapted to receive a digital video signal and to generate therefrom a compressed or partially compressed coded signal utilising motion compensation based on macroblocks of a picture, and at least one compression decoder adapted to receive a compressed or partially compressed coded signal and to generate therefrom a decoded or partially decoded signal, characterised in that an information bus extends from a decoder or to a coder in the chain, the information bus including a picture rate timing and a macroblock rate timing and carrying both picture rate and macroblock rate information relating to a coding operation for use in a later signal process.
Claim 2
Dependent Claim
115 words
A signal transmission chain comprising at least one video compression coder adapted to receive a digital video signal and to generate therefrom a compressed or partially compressed coded signal utilising motion compensation based on macroblocks of a picture, and at least one compression decoder adapted to receive a compressed or partially compressed coded signal and to generate therefrom a decoded or partially decoded signal, characterised in that an information bus extends from a decoder or to a coder in the chain, the information bus including a picture rate timing and a macroblock rate timing and carrying both picture rate and macroblock rate information relating to a coding operation for use in a later signal process.
Claim 3
Dependent Claim
24 words
A signal transmission chain according to claim 1 , wherein the information bus extends from a decoder to a later coder in the chain.
Claim 4
Dependent Claim
32 words
A signal transmission chain according to claim 2 , wherein the information bus carries information relating to a decoding process in said decoder for use in an encoding process in said coder.
Claim 5
Dependent Claim
49 words
A signal transmission chain according to claim 1 wherein the information bus carries motion vector information together with at least one piece of information selected from the group consisting of macroblock scan mode; error concealment flag; causes for concealment; numbers of bits used per block; and candidate motion vectors.
Claim 6
Dependent Claim
62 words
A signal transmission chain according to claim 1 wherein the information bus carries motion vector information together with at least one piece of information selected from the group consisting of motion vector source; cut detection; numbers of I, P and B frames remaining in GOP; film phase (or 3:2 pulldown) detection; field or frame like index; pan vector identification; and letterbox detection.
Claim 7
Dependent Claim
26 words
A signal transmission chain according to claim 1 , wherein the picture rate information carried by the information bus comprises coding type and quantiser matrix information.
Claim 8
Dependent Claim
27 words
A signal transmission chain according to claim 6 , wherein the picture rate information carried by the information bus further comprises time reference and display offsets information.
Claim 9
Dependent Claim
60 words
A signal transmission chain according to claim 6 , wherein the picture rate information further includes at least one piece of information selected from the group consisting of motion vector source; cut detection; numbers of I, P and B frames remaining in GOP; film phase (or 3:2 pulldown) detection; field or frame like index; pan vector identification; and letterbox detection.
Claim 10
Dependent Claim
26 words
A signal transmission chain according to claim 1 , wherein the macroblock rate information carried by the information bus comprises macroblock type, and motion vector information.
Claim 11
Dependent Claim
28 words
A signal transmission chain according to claim 9 , wherein the macroblock rate information carried by the information bus further comprises motion type and motion vector type information.
Claim 12
Dependent Claim
52 words
A signal transmission chain according to claim 9 , wherein the macroblock rate information carried by the information bus further includes at least one piece of information selected from the group consisting of macroblock scan mode; error concealment flag; causes for concealment; numbers of bits used per block; and candidate motion vectors.
Claim 13
Dependent Claim
138 words
A signal transmission chain comprising at least one video compression coder adapted to receive a digital video signal and to generate therefrom a compressed or partially compressed coded signal utilising motion compensation based on macroblocks of a picture, and at least one compression decoder adapted to receive a compressed or partially compressed coded signal and to generate therefrom a decoded or partially decoded signal, characterised in that an information bus extends from a decoder or to a coder in the chain, the information bus including a picture rate timing and a macroblock rate timing and carrying both picture rate and macroblock rate information relating to a coding operation for use in a later signal process, the picture rate information comprising coding type and quantiser matrix information and the macroblock rate information comprising macroblock type and motion vector information.
Claim 14
Dependent Claim
138 words
A signal transmission chain comprising at least one video compression coder adapted to receive a digital video signal and to generate therefrom a compressed or partially compressed coded signal utilising motion compensation based on macroblocks of a picture, and at least one compression decoder adapted to receive a compressed or partially compressed coded signal and to generate therefrom a decoded or partially decoded signal, characterised in that an information bus extends from a decoder or to a coder in the chain, the information bus including a picture rate timing and a macroblock rate timing and carrying both picture rate and macroblock rate information relating to a coding operation for use in a later signal process, the picture rate information comprising coding type and quantiser matrix information and the macroblock rate information comprising macroblock type and motion vector information.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-09-03 | 2005-03-05 | 2005-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-09-03 | 2009-03-05 | 2009-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-09-03 | 2013-03-05 | 2013-09-04 | $7700.00 | Window Closed / Lapsed |