EP0588668A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Coding and decoding digital video signals having duplicate pictures and frames with fields originating from different film source frames
Assignee: Sony Corp
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Filing: 1993-09-20
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Granted: —
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Expires: 2013-09-20
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 C/O Intellectual Property Div. Yagasaki
- 👤 Teruhiko c/o Intellectual Property Div. Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 22:51
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: 38
Claim 1
Independent Claim
101 words
A method for coding an input video signal to provide a coded signal, the input video signal having a field rate of 60 Hz and being derived from a motion picture film source using 2-3 pulldown, the method comprising the steps of: detecting in the input video signal first frames consisting of fields derived from different frames of the motion picture film source; and predictive coding the input video signal to provide the coded signal by using second frames as reference pictures, second frames being frames of the input video signal other than the first frames detected in the detecting step.
Claim 2
Dependent Claim
19 words
The method of claim 1, wherein, in the detecting step, duplicate fields in the video input signal are detected.
Claim 3
Dependent Claim
51 words
The method of claim 2, additionally comprising the steps of: eliminating the duplicate fields from the input video signal; including in the coded signal: a skip-picture flag in lieu of each eliminated duplicate field, and a reference picture code identifying a field to be copied to provide each eliminated duplicated field.
Claim 4
Independent Claim
24 words
The method of any of claims 1 to 3, wherein, in the predictive coding step, each first frame is coded using bidirectional predictive coding.
Claim 5
Independent Claim
24 words
The method of any of claims 1 to 3, wherein, in the predictive coding step, each first frame is coded using field mode coding.
Claim 6
Independent Claim
39 words
The method of any of claims 1 to 4, wherein: in the predictive coding step, field mode coding is applied to each first frame; and the predictive coding step includes the step of orthogonally transforming each first frame field-by-field.
Claim 7
Independent Claim
38 words
The method of any preceding claim, wherein: in the predictive coding step, frame-mode coding is applied to each second frame; and the predictive coding step further comprises the step of orthogonally transforming each second frame as a frame.
Claim 8
Independent Claim
34 words
The method of any of claims 1 to 3, wherein, in the predictive coding step, each first frame is coded using field mode coding and each second frame is coded using frame mode coding.
Claim 9
Independent Claim
32 words
The method of any preceding claim, additionally comprising the steps of: providing a recording medium; deriving a recording signal from the coded signal; and recording the recording signal on the recording medium.
Claim 10
Independent Claim
89 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; eliminating each 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.
Claim 11
Dependent Claim
38 words
The method of claim 10, wherein, in the step of detecting duplicate pictures, a picture in the input video signal exhibiting one of little and no change relative to another picture in the input video signal is detected.
Claim 12
Dependent Claim
101 words
The method of claim 10, 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 13
Independent Claim
164 words
A method for decoding a coded signal to provide an output video signal, the coded signal being derived by applying predictive coding to an input video signal having a field rate of 60 Hz and being derived from a motion picture film source using 2-3 pull-down, the predictive coding being applied such that frames of the input video signal consisting of fields derived from different frames of the motion picture source are coded using field mode coding, and all other frames of the input video signal are coded using frame mode coding, the coded video signal including a processing mode flag signal indicating a coding mode for each frame, the method comprising the steps of: extracting the processing mode flag for each frame from the coded signal; and applying inverse predictive coding to the coded signal to provide the output video signal, the inverse predictive coding for each frame having the coding mode indicated by the processing mode flag extracted in the extracting step.
Claim 14
Independent Claim
37 words
The method of clan 13, wherein, in the step of applying inverse predictive coding to the coded signal, frames consisting of fields derived from different frames of the motion picture film are not used as reference pictures.
Claim 15
Dependent Claim
110 words
The method of claim 13, wherein: the coded signal is additionally derived by eliminating duplicate fields from the input video signal, and the coded signal additionally includes a skip-picture flag in lieu of each eliminated duplicate field, and a reference picture code identifying a field to be copied to provide each eliminated duplicated field; in the extracting step, the skip-picture flag and the reference picture code are additionally extracted from the coded signal; and in the step of applying inverse prediction coding, in response to each skip picture flag, the field indicated by the reference picture code is copied to restore an eliminated duplicate field to the output video signal.
Claim 16
Independent Claim
121 words
A method for decoding a coded signal to provide an output video signal, the coded signal being generated by eliminating duplicate pictures from an input video signal, the coded signal including, in lieu of each eliminated duplicate picture, a skip-picture flag, and a reference picture code identifying a picture to be copied to provide the eliminated duplicate picture, the method comprising the step of: extracting the skip picture flag and the reference picture code from the coded video signal; applying inverse predictive coding to the coded signal to provide the output video signal; and copying, in response to the skip picture flag, the picture indicated by the reference picture code to restore an eliminated duplicate picture to the output video signal.
Claim 17
Dependent Claim
66 words
A recording, comprising: a recording medium; and a recording signal recorded in the recording medium, the recording signal including a coded video input signal derived from a motion picture film source, the coded video input signal being coded by predictive coding using as reference pictures only frames of the input video signal that consist of fields derived from the same frame of the motion picture source.
Claim 18
Dependent Claim
47 words
The recording of claim 17, wherein: the recording signal additionally includes: a skip-picture flag in lieu of a duplicate field eliminated from the input video signal; and a reference picture code identifying a field in the recording signal to be copied to provide the eliminated duplicated field.
Claim 19
Dependent Claim
46 words
The recording of claim 17 or 18, wherein: the recording signal is divided into frames corresponding to frames of the input video signal; and frames of the recording signal derived from two different frames of the motion picture film source are further divided into two fields.
Claim 20
Dependent Claim
61 words
A recording, comprising: a recording medium; and a recording signal recorded in the recording medium, the recording signal including a coded video input signal wherefrom duplicate pictures are eliminated, the recording signal including in lieu of each eliminated duplicate picture, a skip picture flag and a picture reference code identifying a field to be copied to restore the eliminated duplicate picture.
Claim 21
Independent Claim
104 words
An apparatus for coding an input video signal to provide a coded signal, the input video signal having a field rate of 60 Hz and being derived from a motion picture film source using 2-3 pulldown, the apparatus comprising: detecting means for detecting in the input video signal first frames consisting of fields derived from different frames of the motion picture film source; and predictive coding means for providing the coded signal by predictively coding the input video signal using second frames as reference pictures, second frames being frames of the input video signal other than the first frames detected by the detecting means.
Claim 22
Dependent Claim
19 words
The apparatus of claim 21, wherein the detecting means is for detecting duplicate fields in the video input signal.
Claim 23
Dependent Claim
53 words
The apparatus of claim 22, additionally comprising: means for eliminating the duplicate fields from the input video signal; and means for including in the coded signal: a skip-picture flag in lieu of each eliminated duplicate field, and a reference picture code identifying a field to be copied to provide each eliminated duplicated field.
Claim 24
Independent Claim
20 words
The apparatus of claims 21 to 23 wherein the predictive coding means codes each first frame using bidirectional predictive coding.
Claim 25
Independent Claim
20 words
The apparatus of claims 21 to 21, wherein the predictive coding means codes each first frame using field frame coding.
Claim 26
Independent Claim
36 words
The apparatus of any of claims 21 to 23, wherein: the predictive coding means applies field mode coding to each first frame; and the predictive coding means includes means for orthogonally transforming each first frame field-by-field.
Claim 27
Independent Claim
39 words
The apparatus of any of claims 21 to 23, wherein: the predictive coding means applies frame mode coding to each second frame; and the predictive coding step additionally comprises means for orthogonally transforming each second frame as a frame.
Claim 28
Independent Claim
31 words
The apparatus of any of claims 21 to 23, wherein the predictive coding means codes each first frame using field mode coding and codes each second frame using frame mode coding.
Claim 29
Independent Claim
32 words
The apparatus of any of claims 21 to 28, additionally comprising: means for deriving a recording signal from the coded signal; and means for recording the recording signal on the recording medium.
Claim 30
Independent Claim
99 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 each 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.
Claim 31
Dependent Claim
39 words
The apparatus of claim 30, wherein the detecting means is for detecting as a duplicate picture a picture in the input video signal exhibiting one of little and no change relative to another picture in the input video signal.
Claim 32
Dependent Claim
100 words
The apparatus of claim 30, 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 33
Independent Claim
166 words
An apparatus for decoding a coded signal to provide an output video signal, the coded signal being derived by applying predictive coding to an input video signal having a field rate of 60 Hz and being derived from a motion picture film source by 2-3 pull-down, the predictive coding being applied such that frames of the input video signal consisting of fields derived from different frames of the motion picture source are coded using field mode coding, and all other frames of the input video signal are coded using frame mode coding, the coded video signal including a processing mode flag signal indicating a coding mode for each frame, the apparatus comprising: extracting means for extracting the processing mode flag for each frame from the coded signal; and means for applying inverse predictive coding to the coded signal to provide the output video signal, the inverse predictive coding for each frame having the coding mode indicated by the processing mode flag extracted by the extracting means.
Claim 34
Dependent Claim
38 words
The apparatus of claim 33, wherein: the means for applying inverse predictive coding to the coded signal uses frames other than frames consisting of fields derived from different frames of the motion picture film source as reference pictures.
Claim 35
Dependent Claim
111 words
The apparatus of claim 33, wherein: the coded signal is additionally derived by eliminating duplicate fields from the input video signal, and the coded signal additionally includes a skip-picture flag in lieu of each eliminated duplicate field, and a reference picture code identifying a field to be copied to provide each eliminated duplicated field: the extracting means is additionally for extracting the skip-picture flag and the reference picture code from the coded signal; and the mean for applying inverse prediction coding is additionally for copying, in response to the skip picture flag, the field indicated by the reference picture code to restore an eliminated duplicate field to the output video signal.
Claim 36
Independent Claim
123 words
An apparatus for decoding a coded signal to provide an output video signal, the coded signal being generated by eliminating duplicate pictures from an input video signal, the coded signal including a skip-picture flag in lieu of each eliminated duplicate picture, and a reference picture code identifying a field to be copied to provide the eliminated duplicate picture, the apparatus comprising: means for extracting the skip picture flag and the reference picture code from the coded signal; means for applying inverse predictive coding to the coded signal to provide the output video signal; and means for copying, in response to the skip picture flag, the picture indicated by the reference picture code to restore an eliminated duplicate field to the output video signal.
Claim 37
Dependent Claim
124 words
A system for deriving a recording signal from an input video signal and for reproducing the recorded signal to provide an output video signal, the recording signal having a bit rate substantially lower than the input video signal and the output video signal, the input video signal and the output video signal having a field rate of 60 Hz, the input video signal being derived from a motion picture film source using 2-3 pulldown, the system comprising: an encoding apparatus as claimed in claim 28 and further comprising means for including in the recording signal a processing mode flag indicating a coding mode for each frame of the input video signal; and a decoding apparatus as claimed in any of claims 33 to 35.
Claim 38
Dependent Claim
67 words
A system for deriving a recording signal from an input video signal and for reproducing the recorded signal to provide an output video signal, the recording signal having a bit rate substantially lower than the input video signal and the output video signal, the system comprising: an encoding apparatus as claimed in any of claims 30 to 32; and a decoding apparatus as claimed in claim 36.
References Cited (Backward Citations)
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