EP0461659A2
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Coding method and coding apparatus
Assignee: Mitsubishi Electric Corp
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Filing: 1991-06-13
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Granted: —
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Expires: 2011-06-13
Abstract
Abstract A coding method and apparatus for coding a digital video signal of interlaced type. Three-dimensional (horizontal, vertical and temporal directions) blocks are constructed for every plurality of picture elements, orthogonal transform is performed to each of the three-dimensional blocks and coefficients area coded. Coefficients non-effected by pseudo-moving part are performed weighting with low rate, and coefficients effected by pseudo-moving part are performed weighting with high rate. After the vertical positions of picture elements of odd-number fields and those of even-number fields are coincided with each other by intra-field picture elements operation, the digital video signal is formatted and three-dimensional orthogonal transform is performed. <IMAGE>
Inventors
- 👤 Yoshiko Denshi Shohin Kaihatsu Kenkyusho Hatano
- 👤 Ken Denshi Shohin Kaihatsu Kenkyusho Onishi
- 👤 Yoshinori Denshi Shohin Kaihatsu Kenkyush Asamura
- 👤 Takashi Denshi Shohin Kaihatsu Kenkyush Itou
- 👤 Manabu Denshi Shohin Kaihatsu Kenkyush Tsukamoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 21:48
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/60; H04N19/649; H04N19/10; H04N19/102; H04N19/124; H04N19/126; H04N19/62
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
87 words
A coding method for coding a digital video signal of interlaced type, comprising: a step of constructing three-dimensional blocks for every plurality of picture elements, picture elements in the horizontal direction of each field being primary components, picture elements in the vertical direction of each field being secondary components, picture elements of plurality of fields having nearly coincidental two-dimensional spatial position being tertiary components; a step of performing orthogonal transform to each constructed three-dimensional block thereby to obtain coefficients; and a step of coding the obtained coefficients.
Claim 2
Dependent Claim
18 words
A coding method as set forth in Claim 1, wherein said orthogonal transform is DCT (Discrete Cosine Transform).
Claim 3
Dependent Claim
70 words
A coding method for coding a digital video signal of interlaced type, comprising: a step of constructing two-dimensional blocks for every picture elements in each field; a step of constructing a three-dimensional block by bundling two-dimensional blocks of plurality of fields having nearly coincidental two-dimensional spatial position; a step of performing orthogonal transform to the constructed three-dimensional block thereby to obtain coefficients; and a step of coding the obtained coefficients.
Claim 4
Dependent Claim
73 words
A coding method for coding digital video signal of interlaced type, comprising: a step of formatting said digital video signal at least in temporal direction thereby to construct blocs; a step of performing orthogonal transform to each constructed block thereby to obtain coefficients; and a step of quantizing and coding the obtained coefficients, wherein coefficients whose values are zero when the formatted signal corresponds to a still picture are performed weighting before quantizing.
Claim 5
Dependent Claim
18 words
A coding method as set forth in Claim 4, wherein said orthogonal transform is DCT (Discrete Cosine Transform).
Claim 6
Dependent Claim
53 words
A coding method as set forth in Claim 5, wherein said interlaced type is 2:1 interlaced one, and when digital video signal of 2N fields (N: a natural number) is performed DCT thereby to obtain zero-th to (2N-1)-th coefficients, 2m-th coefficients (m: a natural number less than N) are performed weighting and quantized.
Claim 7
Dependent Claim
110 words
A coding method for coding a digital video signal of interlaced type, comprising: a step of constructing three-dimensional blocks for every plurality of picture elements, picture elements in the horizontal direction of each field being primary components, picture elements in the vertical direction of each field being secondary components, picture elements of plurality of fields having nearly coincidental two-dimensional spatial position being tertiary components; a step of performing orthogonal transform to each constructed three-dimensional block thereby to obtain coefficients; and a step of quantizing and coding the obtained coefficients, wherein coefficients whose value are zero when the three-dimensional formatted signal corresponds to a still picture are performed weighting before quantizing.
Claim 8
Dependent Claim
103 words
A coding method for coding a digital video signal of interlaced type, comprising: a step of formatting said digital video signal at least in temporal direction thereby to construct blocks; a step of performing orthogonal transform to each constructed block thereby to obtain coefficients; a step of weighting and quantizing the obtained coefficients thereby to obtain quantized data; and a step of coding the quantized data, wherein coefficients whose values are zero when the formatted signal corresponds to a still picture are performed weighting with lower rate than coefficients whose values are not zero when the formatted signal corresponds to a still picture.
Claim 9
Dependent Claim
18 words
A coding method as set forth in Claim 8, wherein said orthogonal transform is DCT (Discrete Cosine Transform).
Claim 10
Dependent Claim
63 words
A coding method as set forth in Claim 9, wherein said interlaced type is 2:1 interlaced one, and when digital video signal of 2N fields (N: natural number) is performed DCT thereby to obtain zero-th to (2N-1)-th coefficients, 2m-th coefficients (m: a natural number less than N) are performed weighting with lower rate than (2k-1)-th coefficients(k: a natural number not larger than N.)
Claim 11
Dependent Claim
139 words
A coding method for coding a digital video signal of interlaced type, comprising: a step of constructing three-dimensional blocks for every plurality of picture elements, picture elements in the horizontal direction of each field being primary components, picture elements in the vertical direction of each field being secondary components, picture elements of plurality of fields having nearly coincidental two-dimensional spatial position being tertiary components; a step of performing orthogonal transform to each constructed three-dimensional block thereby to obtain coefficients; a step of weighting and quantizing the obtained coefficients thereby to obtain quantized data; and a step of coding the quantized data, wherein coefficients whose values are zero when the three-dimensional formatted signal corresponds to a still picture are performed weighting with lower rate than coefficients whose values are not zero when the formatted signal corresponds to a still picture.
Claim 12
Dependent Claim
68 words
A coding method for coding a digital video signal of interlaced type, comprising: a first step of executing operation by use of picture elements in the vertical direction in each field thereby to make the spatial position of picture elements in odd-number field and that in even-number field same; a second step of executing operation as to picture elements of plurality of fields having the same spatial position.
Claim 13
Dependent Claim
82 words
A coding method as set forth in Claim 12, wherein said first step comprises the following steps: a step of inserting picture elements with zero level every other picture elements in the vertical direction so that the number of picture elements becomes double; a step of passing data after inserted zero picture element through a interpolation filter; and a step of removing picture elements thereby to make the spatial position of picture elements in odd-number field and that in even-number field same.
Claim 14
Dependent Claim
122 words
A coding method for coding a digital video signal of interlaced type, comprising: a step of executing operation by use of picture elements in the vertical direction in each field thereby to make the spatial position of picture elements in odd-number field and that in even-number field same; a step of constructing three-dimensional blocks for every plurality of picture elements, picture elements in the horizontal direction of each field being primary components, picture elements in the vertical direction of each field being secondary components, picture elements of plurality of fields having nearly coincidental two-dimensional spatial position being tertiary components; a step of performing orthogonal transform to each constructed three-dimensional block thereby to obtain coefficients:; and a step of coding the obtained coefficients.
Claim 15
Dependent Claim
84 words
A coding apparatus for coding a digital video signal of interlaced type, comprising: means for constructing three-dimensional blocks for every plurality of picture elements, picture elements in the horizontal direction of each field being primary components, picture elements in the vertical direction of each field being secondary components, picture elements of plurality of fields having nearly coincidental two-dimensional spatial position being tertiary components; means for performing orthogonal transform to each constructed three-dimensional block thereby to obtain coefficients; and means for coding the obtained coefficients.
Claim 16
Dependent Claim
118 words
A coding apparatus for coding a digital video signal of interlaced type, comprising: means for executing operation by use of picture elements in the vertical direction in each field thereby to make the spatial position of picture elements in odd-number field and that in even-number field same; means for constructing three-dimensional blocks for every plurality of picture elements, picture elements in the horizontal direction of each field being primary components, picture elements in the vertical direction of each field being secondary components, picture elements of plurality of fields having nearly coincidental two-dimensional spatial position being tertiary components; means for performing orthogonal transform to each constructed three-dimensional block thereby to obtain coefficients; and means for coding the obtained coefficients.
Claim 17
Dependent Claim
139 words
A coding and decoding apparatus for coding a digital video signal of interlaced type and for decoding a coded data thereby to obtain the digital video signal, comprising: means for constructing three-dimensional blocks for every plurality of picture elements, picture elements in the horizontal direction of each field being primary components, picture elements in the vertical direction of each field being secondary components, picture elements of plurality of fields having nearly coincidental two-dimensional spatial position being tertiary components; means for performing orthogonal transform to each constructed three-dimensional block thereby to obtain coefficients; means for coding the obtained coefficients. means for decoding the coded data thereby to obtain coefficients; means for performing inverse orthogonal transform to the obtained coefficients thereby to obtain three-dimensional blocks; and means for synthesizing the obtained three-dimensional blocks thereby to obtain the original digital video signal.
References Cited (Backward Citations)
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