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US5768469A
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Apparatus for coding and decoding a digital video signal having duplicate pictures and frames with fields originating from different film source frames
Assignee: Sony Corp
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Filing: 1996-10-29
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Granted: 1998-06-16
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Expires: 2016-10-29
Abstract
Abstract A method for coding an input video signal to provide a coded signal. The input video signal has a field rate of 60 Hz and is derived from a motion picture film source using 2-3 pulldown. In the method, first frames, consisting of fields derived from different frames of the motion picture film source, are detected in the input video signal. Then, the input video signal is predictively coded to provide the coded signal by using second frames as reference pictures. Second frames are frames of the input video signal other than the first frames detected in the detecting step. In an alternative method for coding an input video signal to provide a coded signal, duplicate pictures are detected in the input video signal, and duplicate pictures are eliminated from the input video signal to provide an encoder input signal. The encoder input signal is predictively coded using plural predictive coding methods to provide the coded signal. Finally, a skip-picture flag is included in the coded signal in lieu of each eliminated duplicate picture, and a reference picture code identifying a field to be copied to provide each eliminated duplicate picture is also included in the coded signal.
Inventors
- 👤 Yoichi Yagasaki
- 👤 Teruhiko Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:15
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/24; H04N7/52; G; G11; G11B; G11B20/00; H04N19/00; H04N19/10; H04N19/102; H04N19/103; H04N19/105; H04N19/112; H04N19/132; H04N19/134; H04N19/136; H04N19/137; H04N19/169; H04N19/17; H04N19/172; H04N19/176; H04N19/46; H04N19/50; H04N19/503; H04N19/51; H04N19/577; H04N19/587; H04N19/59; H04N19/60; H04N19/61; H04N19/85; H04N7/01; H04N7/0112; H04N19/146; H04N19/152
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
192 words
A method for coding an input video signal to provide a coded signal, the method comprising the steps of: detecting duplicate pictures in the input video signal; in response to the detecting step, eliminating each detected duplicate picture from the video signal to provide an encoder input signal; predictive coding the encoder input signal using plural predictive coding methods to provide the coded signal; including in the coded signal: a skip-picture flag in lieu of each eliminated duplicate picture; and a reference picture code identifying a field to be copied to provide each eliminated duplicate picture, wherein, in the step of detecting duplicate pictures, a picture to be coded using forward prediction is detected as a duplicate picture when all macroblocks in the picture are predicted from one reference picture, and have a motion vector with a zero magnitude, and no DCT coefficients are generated, and a picture to be coded using bidirectional prediction is detected as a duplicate picture when all macroblocks of the picture have the same prediction mode, are predicted from one reference picture, and have a motion vector with a zero magnitude, and no DCT coefficients are generated.
Claim 2
Independent Claim
192 words
A method for coding an input video signal to provide a coded signal, the method comprising the steps of: detecting duplicate pictures in the input video signal; in response to the detecting step, eliminating each detected duplicate picture from the video signal to provide an encoder input signal; predictive coding the encoder input signal using plural predictive coding methods to provide the coded signal; including in the coded signal: a skip-picture flag in lieu of each eliminated duplicate picture; and a reference picture code identifying a field to be copied to provide each eliminated duplicate picture, wherein, in the step of detecting duplicate pictures, a picture to be coded using forward prediction is detected as a duplicate picture when all macroblocks in the picture are predicted from one reference picture, and have a motion vector with a zero magnitude, and no DCT coefficients are generated, and a picture to be coded using bidirectional prediction is detected as a duplicate picture when all macroblocks of the picture have the same prediction mode, are predicted from one reference picture, and have a motion vector with a zero magnitude, and no DCT coefficients are generated.
Claim 3
Independent Claim
201 words
An apparatus for coding an input video signal to provide a coded signal, the apparatus comprising: detecting means for detecting duplicate pictures in the input video signal; means for eliminating, in response to the detecting means, each detected duplicate picture from the input video signal to provide an encoder input signal; predictive coding means for predictively coding the encoder input signal using plural predictive coding methods to provide the coded signal; and means for including in the coded signal: a skip-picture flag in lieu of each eliminated duplicate picture, and a reference picture code identifying a field to be copied to provide each eliminated duplicate picture, wherein the detecting means is for detecting a picture to be coded using forward prediction as a duplicate picture when all macroblocks in the picture are predicted from one reference picture, and have a motion vector with a zero magnitude, and no DCT coefficients are generated, and is for detecting a picture to be coded using bidirectional prediction as a duplicate picture when all macroblocks of the picture have the same prediction mode, are predicted from the one reference picture, and have a motion vector with a zero magnitude; and no DCT coefficients are generated.
Claim 4
Independent Claim
201 words
An apparatus for coding an input video signal to provide a coded signal, the apparatus comprising: detecting means for detecting duplicate pictures in the input video signal; means for eliminating, in response to the detecting means, each detected duplicate picture from the input video signal to provide an encoder input signal; predictive coding means for predictively coding the encoder input signal using plural predictive coding methods to provide the coded signal; and means for including in the coded signal: a skip-picture flag in lieu of each eliminated duplicate picture, and a reference picture code identifying a field to be copied to provide each eliminated duplicate picture, wherein the detecting means is for detecting a picture to be coded using forward prediction as a duplicate picture when all macroblocks in the picture are predicted from one reference picture, and have a motion vector with a zero magnitude, and no DCT coefficients are generated, and is for detecting a picture to be coded using bidirectional prediction as a duplicate picture when all macroblocks of the picture have the same prediction mode, are predicted from the one reference picture, and have a motion vector with a zero magnitude; and no DCT coefficients are generated.
References Cited (Backward Citations)
US4788589A
Cited
US5140437A
Cited
EP0395276A2
Cited
US5016101A
Cited
WO1991006182A1
Cited
US5255091A
Cited
US5221966A
Cited
GB2240232A
Cited
WO1991013520A1
Cited
US5191427A
Cited
US5608888A
Cited
US5267035A
Cited
US5386234A
Cited
US5510840A
Cited
US5272529A
Cited
US5241382A
Cited
US5278647A
Cited
US5461420A
Cited
US5491516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-06-15 | 2001-12-15 | 2002-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-15 | 2005-12-15 | 2006-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-15 | 2009-12-15 | 2010-06-16 | $7700.00 | Window Closed / Lapsed |