EP0526163A2
Expired / Lapsed
EP
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Image coding method and image coding apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1992-07-28
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Granted: —
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Expires: 2012-07-28
Abstract
Abstract In high efficiency coding of motion image signal in transmission or recording of the motion image signal, plural predict signals are determined by independently compensating a motion of reproduction signals of plural frames positioned before a frame to be coded. A linear combination of these predict signals is used as a predict signal. An error of the frame to be coded and the predict signal is coded. As a result, the distortion of the predict signal, that is, the predict error is reduced, and the coding efficiency is enhanced.
Inventors
- 👤 Atsushi Nagata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 08:23
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/926; H04N5/9261; H04N5/9264; H04N19/00; H04N19/10; H04N19/102; H04N19/103; H04N19/105; H04N19/112; H04N19/124; H04N19/134; H04N19/136; H04N19/137; H04N19/146; H04N19/152; H04N19/169; H04N19/17; H04N19/172; H04N19/46; H04N19/50; H04N19/503; H04N19/51; H04N19/577; H04N19/58; H04N19/60; H04N19/61; H04N5/9262; H04N19/13; H04N19/90; H04N19/91
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
69 words
An image coding method comprising the steps of: compensating a motion of reproduction signals of N (N being an integer of 2 or more) frames positioned before a frame to be coded to obtain first to N-th predict signals; determining a linear combination of the first to N-th predict signals to obtain a predict signal; and coding a difference of the frame to be coded and the predict signal.
Claim 2
Dependent Claim
67 words
An image coding method comprising the steps of: compensating a motion of reproduction signals of two frames positioned before a frame to be coded to obtain a first predict signal and a second predict signal; determining an average of the first predict signal and the second predict signal to obtain a predict signal; and coding a difference of the frame to be coded and the predict signal.
Claim 3
Dependent Claim
114 words
An image coding method comprising the steps of: compensating a motion of reproduction signals of two frames positioned before a frame to be coded to obtain a first predict signal and a second predict signal; determining an average of the first predict signal and the second predict signal to obtain a third predict signal; determining a size of a predict error of the first, second and third predict signal in each block composed of a set of plural pixels; selecting one having a smallest predict error out of the first, second and third predict signals to obtain a predict signal; and coding a difference of the frame to be coded and the predict signal.
Claim 4
Dependent Claim
87 words
An image coding method comprising the steps of: compensating a motion of reproduction signals of two frames positioned before a frame to be coded to obtain a first predict signal and a second predict signal; determining an average of the first predict signal and the second predict signal to obtain a third predict signal; selecting one out of two or more predict signals including the third predict signal to obtain a predict signal; and coding a difference of the predict signal and the frame to be coded.
Claim 5
Dependent Claim
108 words
An image coding apparatus comprising: coding means for coding a difference of a frame to be coded and a predict signal to produce a predict error code; decoding means for decoding the predict error code to obtain a reproduction signal; memory means for storing the reproduction signal; motion compensating means for compensating a motion of N (N being an integer of 2 or more) frames before the frame to be coded in the reproduction signal stored in the memory means to obtain first to N-th predict signals; and linear combining means for determining a linear combination of the first to N-th predict signals to obtain the predict signal.
Claim 6
Dependent Claim
137 words
An image coding apparatus comprising: coding means for coding a difference of a frame to be coded and a predict signal to produce a predict error code; decoding means for decoding the predict error code to obtain a reproduction signal; memory means for storing the reproduction signal; motion compensating means for compensating a motion of N (N being an integer of 2 or more) frames before the frame to be coded in the reproduction signal stored in the memory means to obtain first to N-th predict signals; linear combining means for determining a linear combination of the first to the N-th predict signals to obtain a predict signal of a linear combination; and selector means for selecting one out of two or more predict signals including the predict signal of linear combination to obtain the predict signal.
Claim 7
Dependent Claim
174 words
An image coding apparatus comprising: predict error calculating means for producing a difference of a frame to be coded and a predict signal as a predict error signal; coding means for coding the predict error signal to produce a predict error code; decoding means for decoding the predict error code to obtain a reproduction signal; memory means for storing the reproduction signal; compensating means for compensating a motion of two frames positioned before the frame to be coded in the reproduction signal stored in the memory means to obtain a first predict signal and a second predict signal; averaging means for determining an average of the first predict signal and the second predict signal to obtain a third predict signal; and predict error calculating means for determining a size of a predict error of the first, second and third predict signals in every block which is a set of plural pixels; and means for selecting one having a smallest predict error out of the first, second and third predict signals as the predict signal.
Claim 8
Dependent Claim
143 words
An image coding apparatus comprising: predict error calculating means for producing a difference of a frame to be coded and a predict signal as a predict error signal; coding means for coding the predict error signal to produce a predict error code; decoding means for decoding the predict error code to obtain a reproduction signal; memory means for storing the reproduction signal; compensating means for compensating a motion of two frames positioned before the frame to be coded in the reproduction signal stored in the memory means to obtain a first predict signal and a second predict signal; averaging means for determining an average of the first predict signal and the second predict signal to obtain a third predict signal; and selector means for selecting one out of two or more predict signals including the third predict signal to obtain the predict signal.
Claim 9
Dependent Claim
190 words
An image coding apparatus for coding a motion image signal of interlaced scanning method, comprising: predict error calculating means for producing a difference of a field to be coded and a predict signal as a predict error signal; coding means for coding the predict error signal to produce a predict error code; decoding means for decoding the predict error code to obtain a reproduction signal; memory means for storing the reproduction signal; motion compensating means for compensating a motion of a first field and a second field positioned before the field to be coded in the reproduction signal stored in the memory means to obtain a first predict signal and a second predict signal; averaging means for determining an average of the first predict signal and the second predict signal to obtain a third predict signal; and predict error calculating means for determining a size of a predict error of the first, second and third predict signals in every block which is a set of plural pixels; and means for selecting one having a smallest predict error out of the first, second and third predict signals as the predict signal.
Claim 10
Dependent Claim
159 words
An image coding apparatus for coding a motion image signal of interlaced scanning method, comprising: predict error calculating means for producing a difference of a field to be coded and a predict signal as a predict error signal; coding means for coding the predict error signal to produce a predict error code; decoding means for decoding the predict error code to obtain a reproduction signal; memory means for storing the reproduction signal; motion compensating means for compensating a motion of a first field and a second field positioned before the field to be coded in the reproduction signal stored in the memory means to obtain a first predict signal and a second predict signal; averaging means for determining an average of the first predict signal and the second predict signal to obtain a third predict signal; and selector means for selecting one out of two or more predict signals including the third predict signal to obtain the predict signal.
References Cited (Backward Citations)
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