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US5227877A
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High-efficient coding apparatus for video signal
Assignee: Panasonic Holdings Corp
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Filing: 1991-06-21
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Granted: 1993-07-13
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Expires: 2011-06-21
Abstract
Abstract The invention provides a high-efficient coding apparatus for video signal which is intended to control a quantizing step width finely depending on the quality of a inputted image. The coding apparatus is designed to obtain an average value of prediction errors at blocks, each block on which the orthogonal transform is carried out and to define the upper limit of a quantizing step width output from the quantizing step width control circuit depending on the average value. It results in making it possible to finely control the quantizing step width particularly based on each part of the image from a background to a dynamic area.
Inventors
- 👤 Takeshi Yukitake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:27
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/10; H04N19/134; H04N19/136; H04N19/14; H04N19/102; H04N19/124; H04N19/126; H04N19/169; H04N19/17; H04N19/176; H04N19/60; H04N19/61; H04N19/146; H04N19/152
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
A high-efficient coding apparatus for video signal comprising: means for performing a prediction function including motion compensated inter frame prediction and intra frame prediction, means for computing a prediction error and orthogonally transforming said prediction error at each block composed of a set of pixels, means for quantizing an orthogonally transformed coefficient by using a predetermined quantizing step width, and means for defining at least one of an upper limit value and a lower limit value of said quantizing step width.
Claim 2
Dependent Claim
81 words
A high-efficient coding apparatus for video signal comprising: means for performing a prediction function including motion compensated inter frame prediction and intra frame prediction, means for computing a prediction error and orthogonally transforming said prediction error at each block composed of a set of pixels, means for quantizing an orthogonally transformed coefficient by using a predetermined quantizing step width, and means for defining at least one of an upper limit value and a lower limit value of said quantizing step width.
Claim 3
Dependent Claim
38 words
A high-efficient coding apparatus for video signal according to claim 1 wherein at least one of the upper limit and the lower limit of the quantizing step width is defined by using a prediction error at each pixel.
Claim 4
Dependent Claim
38 words
A high-efficient coding apparatus for video signal according to claim 1 wherein at least one of the upper limit and the lower limit is defined by using an average value of prediction errors at a set of pixels.
Claim 5
Dependent Claim
81 words
A high-efficient coding apparatus for video signal comprising: means for performing at least one of motion compensated inter frame prediction or intra frame prediction, means for computing a prediction error and orthogonally transforming said prediction error at each block composed of a set of pixels, means for quantizing an orthogonally transformed coefficient by using a predetermined quantizing step width, and means for defining at least one of an upper limit value and a lower limit value of said quantizing step width.
Claim 6
Dependent Claim
81 words
A high-efficient coding apparatus for video signal comprising: means for performing at least one of motion compensated inter frame prediction or intra frame prediction, means for computing a prediction error and orthogonally transforming said prediction error at each block composed of a set of pixels, means for quantizing an orthogonally transformed coefficient by using a predetermined quantizing step width, and means for defining at least one of an upper limit value and a lower limit value of said quantizing step width.
Claim 7
Dependent Claim
38 words
A high-efficient coding apparatus for video signal according to claim 4 wherein at least one of the upper limit and the lower limit of the quantizing step width is defined by using a prediction error at each pixel.
Claim 8
Dependent Claim
38 words
A high-efficient coding apparatus for video signal according to claim 4 wherein at least one of the upper limit and the lower limit is defined by using an average value of prediction errors at a set of pixels.
Claim 9
Dependent Claim
81 words
A high-efficient coding apparatus for video signal comprising: means for performing prediction as selectively switching motion compensated inter frame prediction and intra frame prediction, means for computing a prediction error and orthogonally transforming said prediction error at each block composed of a set of pixels, means for quantizing an orthogonally transformed coefficient by using a predetermined quantizing step width, and means for defining at least one of an upper limit value and a lower limit value of said quantizing step width.
Claim 10
Dependent Claim
81 words
A high-efficient coding apparatus for video signal comprising: means for performing prediction as selectively switching motion compensated inter frame prediction and intra frame prediction, means for computing a prediction error and orthogonally transforming said prediction error at each block composed of a set of pixels, means for quantizing an orthogonally transformed coefficient by using a predetermined quantizing step width, and means for defining at least one of an upper limit value and a lower limit value of said quantizing step width.
Claim 11
Dependent Claim
38 words
A high-efficient coding apparatus for video signal according to claim 7 wherein at least one of the upper limit and the lower limit of the quantizing step width is defined by using a prediction error at each pixel.
Claim 12
Dependent Claim
38 words
A high-efficient coding apparatus for video signal according to claim 7 wherein at least one of the upper limit and the lower limit is defined by using an average value of prediction errors at a set of pixels.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |