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EP0467718A2
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Image coding apparatus and image decoding apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1991-07-19
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Granted: —
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Expires: 2011-07-19
Abstract
Abstract In a high efficiency coding apparatus for performing plural different types of orthogonal transformation, by reordering the signals after orthogonal transformation and transforming into signals of same statistic characteristics, distortion of coding efficiency due to mismatching of the characteristics of coding device is reduced even if the output of the orthogonally transformed signal is coded by one fixed coding device.
Inventors
- 👤 Shinya Kadono
- 👤 Tatsuro Juri
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 11:19
CPC Classifications
G; G06; G06F; G06F17/00; G06F17/10; G06F17/14; G06F17/147; H; H04; H04N; H04N19/00; H04N19/10; H04N19/102; H04N19/103; H04N19/112; H04N19/90; H04N19/98; H04N19/30
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
71 words
A high efficiency coding apparatus comprising an orthogonal transforming device for performing at least two types of orthogonal transformations on a digital video input signal formed in blooks, a reordering device for selecting one of output signals of the orthogonal transforming device and reordering the selected signal, and a coding device for coding an output signal of the reordering device by a specific technique regardless of the type of orthogonal transformation.
Claim 2
Dependent Claim
25 words
A high efficiency coding apparatus of claim 1, wherein the reordering device is omitted by performing reordering in a part of the orthogonal transforming device.
Claim 3
Dependent Claim
89 words
A high efficiency coding apparatus of claim 2, wherein the orthogonal transforming device orthogonally transforms in two types, that is, an orthogonal transformation for reordering in a sequence of frequency by a two-dimensional orthogonal transformation of vertical m points x horizontal n points on signals in a frame, and an orthogonal transformation for reordering in a sequence of frequency by a three-dimensional orthogonal transformation of vertical (m/2) points x horizontal n points x time on signals in each field at a position corresponding to a signal in the frame.
Claim 4
Dependent Claim
48 words
A high efficiency coding apparatus of claim 3, wherein the data after the three-dimensional orthogonal transformation of (m/2) points x n points x 2 points on the signals in the field are reordered in a sequence of a sum and a difference of frequency components between fields atternately.
Claim 5
Dependent Claim
55 words
A high efficiency coding apparatus of claim 3, wherein the data after the three-dimensional orthogonal transformation of (m/2) points x n points x 2 points on the signals in the field are reordered in a sequence of disposing differences of frequency components between fields after all data of sums of the frequency components between fields.
Claim 6
Dependent Claim
190 words
A high frequency coding apparatus of claim 3, wherein the orthogonal transforming device comprises a first reordering device for reordering the input signal, a first butterfly calculation device for performing butterfly claculation or addition and substraction of data on an output signal of the first reordering device, a first multiplication & butterfly calculation device for performing multiplication and butterfly calculation on an output signal of the first butterfly calculation device, a second reordering device for reordering an output signal of the first multiplication & butterfly calculation device, a second butterfly calculation device for performing butterfly calculation on an output signal of the second reordering device, a second multiplication & butterfly calculation device for performing multiplication and butterfly calculation on an output signal of the second butterfly calculation device, and a third reordering device for reordering an output signal of the second multiplication & butterfly calculation device, and either eight-point cosine transformation or two-dimensional four-point cosine transformation is performed by changing over reordering sequences of the first, second and third reordering devices, and coefficients of multiplications of the first and second multiplication & butterfly calculation devices by an external changeover signal.
Claim 7
Dependent Claim
90 words
A high efficiency coding apparatus of claim 6, wherein the orthogonal transforming device performs two types of orthogonal transformations, that is an orthogonal transformation for reordering in a sequence of frequency by a two-dimensional orthogonal transformation of vertical 8 points x horizontal n points on signals in a frame, and an orthogonal transformation for reordering in a sequence of frequency by a three-dimensional orthogonal transformation of vertical 4 points x horizontal n points x time on signals in each field at a position corresponding to a signal in the frame.
Claim 8
Dependent Claim
48 words
A high efficiency coding apparatus of claim 7, wherein the data after the three-dimensional orthogonal transformation of 4 points x n points x 2 points on the signals in each field are reordered in a sequence of a sum and a difference of frequency components between fields alternately.
Claim 9
Dependent Claim
55 words
A high efficiency coding apparatus of claim 7, wherein the data after the three-dimensional orthogonal transformation of 4 points x n points x 2 points of the signals in each field are reordered in a sequence of placing differences of frequency components between fields after all data of sums of the frequency components between fields.
Claim 10
Dependent Claim
49 words
A high efficiency decoding apparatus comprising a decoding device for decoding a coded input signal, a reordering device for reordering an output signal of the decoding device, and an orthogonal transforming device for performing at least two types of orthogonal transformations on an output signal of the reordering device.
Claim 11
Dependent Claim
26 words
A high efficiency decoding apparatus of claim 10, wherein the reordering device is omitted by performing the reordering in a part of the orthogonal transforming device.
Claim 12
Dependent Claim
68 words
A high efficiency decoding apparatus of claim 11, wherein the orthogonal decoding device performs two types of orthogonal transformations, that is, an orthogonal transformation for performing a two-dimensional orthogonal transformation of vertical m points x horizontal n points on signals in a frame, and an orthogonal transformation for performing a three-dimensional orthogonal transformation of vertical (m/2) points x horizontal n points x time on signals in each field.
Claim 13
Dependent Claim
193 words
A high efficiency decoding apparatus of claim 12, wherein the orthogonal transforming device comprises a first reordering device for reordering the input signal, a first multiplication & butterfly calculation device for performing multiplication and butterfly calculation or addition and substration of data on an output of the first reordering device, a first butterfly calculation device for performing butterfly calculation on an output signal of the first multiplication & butterfly calculation device, a second reordering device for reordering an output signal of the first butterfly calculation device, a second multiplication & butterfly calculation device for performing multiplication and butterfly calculation on an output signal of the second reordering device, a second butterfly calculation device for performing butterfly calculation on an output signal of the second multiplication & butterfly calculation device, and a third reordering device for reordering an output signal of the second butterfly calculation device, and either an eight-point inverse cosine transformation or a two-dimensional four-point inverse cosine transformation is performed by changing over reordering sequences of the first, second and third reordering devices and coefficients of multiplications of the first and second multiplication & butterfly calculation devices by an external changeover signal.
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