EP0512854A2
Expired / Lapsed
EP
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Video signal coding
Assignee: Sony Corp
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Filing: 1992-05-08
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Granted: —
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Expires: 2012-05-08
Abstract
Abstract A circuit is described for independently producing interframe data and intraframe data from a video signal (VD) and thereafter selecting for output, at an inter/intra selector (12) using coefficient values of orthogonally transformed interframe data and intraframe data, the data permitting the more efficient coding.
Inventors
- 👤 Katsumi Tahara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 02:42
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/12; H04N19/00; H04N19/90; H04N19/10; H04N19/102; H04N19/103; H04N19/107; H04N19/50; H04N19/503; H04N19/51; H04N19/60; H04N19/61
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
Apparatus for coding a video signal (VD), said apparatus comprising: intraframe coding means for intraframe coding a video signal; interframe coding means (8, 9) for interframe coding a video signal; first orthogonal transform means (4) for orthogonally transforming intraframe coded data from said intraframe coding means; second orthogonal transform means (5) for orthogonally transforming interframe coded data from said interframe coding means; and selector means (12) for selecting for output said intraframe coded data or said interframe coded data on the basis of coefficient data from said first and second orthogonal transform means.
Claim 2
Dependent Claim
42 words
Apparatus as claimed in claim 1, wherein said video signal is a digital video signal and said intraframe coding means and said interframe coding means (8, 9) encode said digital video signal to form macro blocks (MB) having n x n pixels.
Claim 3
Dependent Claim
23 words
Apparatus as claimed in any one of claims 1 or 2, wherein said interframe coding means (8, 9) includes motion compensating means (6).
Claim 4
Dependent Claim
31 words
Apparatus as claimed in any one of claims 2 or 3, wherein said first and second orthogonal transform means (4, 5) perform discrete cosine transformation (DCT) upon said macro blocks (MB).
Claim 5
Dependent Claim
155 words
Apparatus as claimed in claim 4, wherein, when a mean value of DC components of DCT coefficient data for a macro block (MB) determined by said second orthogonal means (5) is less than a predetermined threshold level, or, when a cumulative value of AC components of DCT coefficient data for said macro block (MB) determined by said second orthogonal transform means (4) is less than a cumulative value of AC components of DCT coefficient data for said macro block (MB) determined by said first orthogonal transform means (5), said selector means (12) selects interframe coded data; while, when said cumulative value of AC components of DCT coefficient data for said macro block (MB) determined by said second orthogonal transform means (5) is more than said cumulative value of AC components of DCT coefficient data for said macro block (MB) determined by said first orthogonal transform means (4), said selector means (12) selects intraframe coded data.
Claim 6
Independent Claim
64 words
A method of coding a video signal (VD), said method comprising the steps of: intraframe coding a video signal; interframe coding a video signal; orthogonally transforming intraframe coded data; orthogonally transforming interframe coded data; and selecting for output said intraframe coded data or said interframe coded data on the basis of coefficient data from orthogonal transformations of intraframe coded data and interframe coded data.
References Cited (Backward Citations)
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