EP0577428A2
Expired / Lapsed
EP
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Image signal coding and decoding and image signal recording medium
Assignee: Sony Corp
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Filing: 1993-07-01
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Granted: —
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Expires: 2013-07-01
Abstract
Abstract The present invention reproduces an input image of half the normal resolution with respect to the vertical and horizontal directions by processing a coded bit stream of a normal resolution. Difference signal (mismatching error signal) representing the difference between a predicted image of the normal resolution and a predicted image of a half resolution with respect to the vertical and horizontal directions is coded and the coded difference signal is transmitted. When producing the predicted image, image data is subjected to motion compensation according to a specified prediction mode.
Inventors
- 👤 Jun c/o Int. Prop. Division Yonemitsu
- 👤 Katsumi c/o Int. Prop. Division Tahara
- 👤 Teruhiko c/o Int. Prop. Division Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 14:16
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/804; H04N9/8042; H04N9/8047; H04N19/00; H04N19/10; H04N19/102; H04N19/103; H04N19/112; H04N19/132; H04N19/169; H04N19/17; H04N19/176; H04N19/18; H04N19/30; H04N19/37; H04N19/48; H04N19/50; H04N19/503; H04N19/51; H04N19/577; H04N19/59; H04N19/60; H04N19/61; H04N19/90; H04N5/00; H04N5/76; H04N5/78; H04N5/781; H04N5/782; H04N5/84; H04N5/85; H04N9/87; H04N9/88; H04N9/888
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
124 words
An image signal coding method that subjects difference image signals representing the differences of input image data from predicted image data to transformation or blocking to produce predetermined coefficient data, and codes the predetermined coefficient data, said image signal coding method comprising steps of: producing first data by the inverse transformation or reconstruction of the coefficient data; extracting a predetermined portion of the coefficient data; producing second data by the inverse transformation or reconstruction of the coefficient data included in the predetermined portion; producing third data by extracting data corresponding to the predetermined portion from the first data and subjecting the extracted data to inverse transformation or reconstruction; and calculating the differences between the second data and the third data, and coding the differences.
Claim 2
Dependent Claim
22 words
An image signal coding method according to claim 1, wherein the transformation is the orthogonal transformation of a block of N*N pixels.
Claim 3
Dependent Claim
14 words
An image coding method according to claim 1, wherein the transformation is wavelet transformation.
Claim 4
Dependent Claim
15 words
An image signal coding method according to claim 1, wherein said blocking is subband blocking.
Claim 5
Dependent Claim
15 words
An image signal coding method according to claim 2, wherein the orthogonal transformation is DCT.
Claim 6
Dependent Claim
26 words
An image signal coding method according to claim 2, wherein the predetermined portion is a block of n*n pixels (n = 1, 2, 3, ..., N-1).
Claim 7
Dependent Claim
32 words
An image signal coding method according to claim 2, wherein the orthogonal transformation is carried out in a field blocking mode when the predicted image is formed in a field prediction mode.
Claim 8
Dependent Claim
32 words
An image signal coding method according to claim 2, wherein the orthogonal transformation is carried out in a frame blocking mode when the predicted image is formed in a frame prediction mode.
Claim 9
Dependent Claim
34 words
An image signal coding method according to claim 1, wherein the third data is produced by extracting coefficient data included in the predetermined portion extracted when producing the second data from the first data.
Claim 10
Dependent Claim
38 words
An image signal coding method according to claim 1, wherein a motion vector detected in producing the first data is calculated by scale transformation, and the motion vector is used for the motion compensation of the second data.
Claim 11
Dependent Claim
37 words
An image signal coding method according to claim 1, wherein the motion compensation of the second data is carried out in a prediction mode on the basis of the motion vector detected in producing the first data.
Claim 12
Dependent Claim
39 words
An image signal coding method according to claim 11, wherein the motion compensation is produced by interpolating or extrapolating pixels at the same position in the same field as those of the pixels used for forming the first data.
Claim 13
Dependent Claim
36 words
An image signal coding method according to claim 1, wherein the second data and the third data are formed in the field prediction mode when the predetermined predicted image is formed in the field prediction mode.
Claim 14
Dependent Claim
24 words
An image signal coding method according to claim 1, wherein the second data and the third data are formed in the frame prediction mode.
Claim 15
Dependent Claim
29 words
An image signal coding method according to claim 5, wherein data representing an interlace structure and data representing frequencies in a low-frequency band among the third data are extracted.
Claim 16
Dependent Claim
171 words
An image signal decoding method that produces predetermined coefficient data by the transformation or blocking of difference image signal representing the difference from a predetermined predicted image, transmits first data obtained by coding the coefficient data, produces second data by the inverse transformation or reconstruction of the coefficient data, extracts the predetermined portion of the coefficient data, produces third data by the inverse transformation or reconstruction of the coefficient data included in the predetermined portion, extracts data corresponding to the predetermined portion from the second data, produces fourth data by the inverse transformation or reconstruction of the data extracted from the second data, calculates the difference between the third data and the fourth data, and decodes the coded difference as fifth data, said image signal decoding method comprising: extracting the predetermined portion of the first data; producing sixth data by the inverse transformation or reconstruction of the data included in the predetermined portion; and adding the fifth data and the sixth data to decode an image corresponding to the predetermined portion.
Claim 17
Dependent Claim
24 words
An image signal decoding method according to claim 16, wherein the inverse transformation is the inverse orthogonal transformation of a block of N-N pixels.
Claim 18
Dependent Claim
17 words
An image signal decoding method according to claim 16, wherein the inverse transformation is wavelet inverse transformation.
Claim 19
Dependent Claim
15 words
An image signal decoding method according to claim 16, wherein the reconstruction is subband reconstruction.
Claim 20
Dependent Claim
15 words
An image signal decoding method according to claim 17, wherein the inverse transformation is IDCT.
Claim 21
Dependent Claim
26 words
An image signal decoding method according to claim 17, wherein the predetermined portion is a block of n*n pixels (n = 1, 2, 3, ..., N-1).
Claim 22
Dependent Claim
37 words
An image signal decoding method according to claim 16, wherein data representing an interlace construction and data representing low-frequency components are extracted from the first data when the coefficient data is obtained in a frame DCT mode.
Claim 23
Dependent Claim
59 words
An image signal decoding method that decodes coded data obtained by the transformation or blocking of difference image signals representing the difference between a predicted image formed in a prediction mode on the basis of a motion vector, and an input image, characterized in that a predicted image for decoding is produced by motion compensation in the prediction mode.
Claim 24
Dependent Claim
54 words
An image signal decoding method according to claim 23, wherein the motion compensation is carried out so that the field of the pixels of the predicted image to be used for decoding coincide with the field of pixels of the predicted image used for coding when the prediction mode is the frame prediction mode.
Claim 25
Dependent Claim
43 words
An image signal decoding method according to claim 23, wherein the pixels of a predicted image used for decoding are produced by interpolation when the corresponding pixels of the predicted image used for coding are produced by interpolation, when carrying out motion compensation.
Claim 26
Dependent Claim
52 words
An image signal decoding method according to claim 23, wherein, when the predicted image used for decoding has pixels corresponding to the pixels of the predicted image used for coding when carrying out motion compensation, the pixels corresponding to those of the predicted image used for coding are used for motion compensation.
Claim 27
Dependent Claim
53 words
An image signal decoding method according to claim 23, wherein motion compensation is carried out so that the position of the pixels of the predicted image to be used for decoding coincides with that of the pixels of the predicted image used for coding when the prediction mode is the field prediction mode.
Claim 28
Dependent Claim
96 words
An image signal decoding method comprising: extracting a predetermined portion of coefficient data produced by the frame DCT or field DCT of predetermined image signals; and decoding the coefficient data included in the extracted predetermined portion of the coefficient data; characterized in that coefficient data representing low-frequency signals is selected so that coefficient data representing an interlace structure is extracted as coefficient data for decoding, when the coefficient data is produced by frame DCT, and coefficient data of low-frequency signals is selected as coefficient data for decoding when the coefficient data is produced by field DCT.
Claim 29
Dependent Claim
20 words
An image signal recording medium capable of recording data coded by the image signal recording method stated in claim 1.
Claim 30
Dependent Claim
146 words
An image signal encoder that produces predetermined coefficient data by the transformation or blocking of a difference image signal representing the difference from a predetermined predicted image and codes the coefficient data, said image signal encoder comprising: a first means for subjecting the coefficient data to inverse transformation or reconstruction; a second means for producing first data by the motion compensation of the output of the first means; a third means for extracting a predetermined portion of the coefficient data; a fourth means for producing second data by the inverse transformation or reconstruction of the coefficient data included in the predetermined portion provided by the third means; a fifth means for producing third data by extracting data corresponding to the predetermined portion from the first data; and a sixth means for coding a difference signal representing the difference between the second data and the third data.
Claim 31
Dependent Claim
21 words
An image signal encoder according to claim 30, further comprising: a seventh means for the motion compensation of the second data.
Claim 32
Dependent Claim
180 words
An image signal decoder that produces predetermined coefficient data by the transformation or blocking of a difference image signal representing the difference from a predetermined predicted image, transmits first data obtained by coding the coefficient data, produces second data by the inverse transformation or reconstruction of the coefficient data, extracts a predetermined portion of the coefficient data, produces third data by the inverse transformation or reconstruction of the coefficient data included in the predetermined portion, extracts data corresponding to the predetermined portion from the second data, produces fourth data by the inverse transformation or reconstruction of the extracted data, calculates the difference between the third data and the fourth data, and decodes fifth data obtained by coding the difference, said image signal decoder comprising: a first decoding means for decoding data included in the predetermined portion among the first data; a second decoding means for decoding the fifth data; and an image reproducing means for reproducing an image corresponding to the predetermined portion on the basis of the respective outputs of the first decoding means and the second decoding means.
Claim 33
Dependent Claim
21 words
An image signal decoder according to claim 32, wherein said image reproducing means has a motion compensating means for motion compensation.
References Cited (Backward Citations)
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