US5559557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motion video coding with adaptive precision for DC component coefficient quantization and variable length coding
Assignee: Sony Corp
•
Filing: 1993-09-28
•
Granted: 1996-09-24
•
Expires: 2013-09-28
Abstract
Abstract Direct current component coefficients resulting from an orthogonal transformation of a video signal are encoded with a precision, expressed in terms of quantization bits, which may be varied at each video sequence, group of pictures, picture, slice, macroblock or block portion of the video signal in accordance with a required picture quality. The encoded coefficients may be decoded in accordance with the precision used during encoding.
Inventors
- 👤 Motoki Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:27
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/10; H04N19/134; H04N19/136; H04N19/169; H04N19/18; H04N19/102; H04N19/124; H04N19/126; H04N19/157; H04N19/159; H04N19/17; H04N19/172; H04N19/176; H04N19/186; H04N19/60; H04N19/61; H04N19/13; H04N19/90; H04N19/91
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
130 words
A method of encoding a video signal having pixels represented by n bits, n being an integer, comprising the steps of: receiving a picture quality signal; selecting an encoding precision of n+m bits, m being a non-negative integer, in accordance with said picture quality signal; orthogonally transforming said video signal to produce direct current component coefficients and alternating current component coefficients; quantizing only said direct current component coefficients using the selected encoding precision; obtaining a difference between a first of said quantized direct current component coefficients and an initial value set in accordance with said selected encoding precision; and variable length encoding the differentiated direct current component coefficients using variable length coding tables, each of said coding tables having a length that is a function of said selected encoding precision.
Claim 2
Independent Claim
130 words
A method of encoding a video signal having pixels represented by n bits, n being an integer, comprising the steps of: receiving a picture quality signal; selecting an encoding precision of n+m bits, m being a non-negative integer, in accordance with said picture quality signal; orthogonally transforming said video signal to produce direct current component coefficients and alternating current component coefficients; quantizing only said direct current component coefficients using the selected encoding precision; obtaining a difference between a first of said quantized direct current component coefficients and an initial value set in accordance with said selected encoding precision; and variable length encoding the differentiated direct current component coefficients using variable length coding tables, each of said coding tables having a length that is a function of said selected encoding precision.
Claim 3
Dependent Claim
32 words
A method according to claim 1, wherein said picture quality signal corresponds to a portion of said video signal selected from a video sequence, group of pictures, picture, slice, macroblock and block.
Claim 4
Dependent Claim
16 words
A method according to claim 2, wherein said block has a size of 8 pixels×8 lines.
Claim 5
Dependent Claim
22 words
A method according to claim 1, wherein n has a value of eight and n+m has a value of eight to eleven.
Claim 6
Dependent Claim
18 words
A method according to claim 1, wherein the step of orthgonally transforming comprises performing a discrete cosine transformation.
Claim 7
Dependent Claim
24 words
A method according to claim 1, wherein said direct current component coefficients include luminance direct current component coefficients and chrominance direct current component coefficients.
Claim 8
Dependent Claim
18 words
A video recording medium having recorded thereon a video signal encoded according to the method of claim 1.
Claim 9
Dependent Claim
17 words
A video recording medium according to claim 7, wherein said video recording medium is an optical disk.
Claim 10
Dependent Claim
11 words
An encoded video signal produced by the method of claim 1.
Claim 11
Independent Claim
139 words
An apparatus for encoding a video signal having pixels represented by n bits, n being an integer, comprising: means for receiving a picture quality signal; means for selecting an encoding precision of n+m bits, m being a non-negative integer, in accordance with said picture quality signal; means for orthogonally transforming said video signal to produce direct current component coefficients and alternating current component coefficients; means for quantizing only said direct current component coefficients using the selected encoding precision; means for obtaining a difference between a first of said quantized direct current component coefficients and an initial value set in accordance with said selected encoding precision; and means for variable length encoding the differentiated direct current component coefficients using variable length coding tables, each of said coding tables having a length that is a function of said selected encoding precision.
Claim 12
Independent Claim
139 words
An apparatus for encoding a video signal having pixels represented by n bits, n being an integer, comprising: means for receiving a picture quality signal; means for selecting an encoding precision of n+m bits, m being a non-negative integer, in accordance with said picture quality signal; means for orthogonally transforming said video signal to produce direct current component coefficients and alternating current component coefficients; means for quantizing only said direct current component coefficients using the selected encoding precision; means for obtaining a difference between a first of said quantized direct current component coefficients and an initial value set in accordance with said selected encoding precision; and means for variable length encoding the differentiated direct current component coefficients using variable length coding tables, each of said coding tables having a length that is a function of said selected encoding precision.
Claim 13
Dependent Claim
32 words
An apparatus according to claim 10, wherein said picture quality signal corresponds to a portion of said video signal selected from a video sequence, group of pictures, picture, slice, macroblock and block.
Claim 14
Dependent Claim
16 words
An apparatus according to claim 11, wherein said block has a size of 8 pixels×8 lines.
Claim 15
Dependent Claim
22 words
An apparatus according to claim 10, wherein n has a value of eight and n+m has a value of eight to eleven.
Claim 16
Dependent Claim
20 words
An apparatus according to claim 10, wherein said means for orthgonally transforming comprises means for performing a discrete cosine transformation.
Claim 17
Dependent Claim
24 words
An apparatus according to claim 10, wherein said direct current component coefficients include luminance direct current component coefficients and chrominance direct current component coefficients.
Claim 18
Dependent Claim
17 words
A video recording medium having recorded thereon a video signal encoded by the apparatus of claim 10.
Claim 19
Dependent Claim
17 words
A video recording medium according to claim 16, wherein said video recording medium is an optical disk.
Claim 20
Independent Claim
138 words
A method of decoding an encoded video signal corresponding to an original video signal having pixels represented by n bits, n being an integer, comprising the steps of: receiving a picture quality signal; selecting a decoding precision of n+m bits, m being a non-negative integer, in accordance with said picture quality signal; extracting encoded direct current component coefficients from said encoded video signal; variable length decoding only said encoded direct current component coefficients using variable length coding tables, each of said coding tables having a length that is a function of the selected decoding precision; obtaining an inverse difference between a first of the variable length decoded direct current component coefficients and an initial value set in accordance with the selected decoding precision; and inverse quantizing the inverse differentiated direct current component coefficients using the selected decoding precision.
Claim 21
Independent Claim
138 words
A method of decoding an encoded video signal corresponding to an original video signal having pixels represented by n bits, n being an integer, comprising the steps of: receiving a picture quality signal; selecting a decoding precision of n+m bits, m being a non-negative integer, in accordance with said picture quality signal; extracting encoded direct current component coefficients from said encoded video signal; variable length decoding only said encoded direct current component coefficients using variable length coding tables, each of said coding tables having a length that is a function of the selected decoding precision; obtaining an inverse difference between a first of the variable length decoded direct current component coefficients and an initial value set in accordance with the selected decoding precision; and inverse quantizing the inverse differentiated direct current component coefficients using the selected decoding precision.
Claim 22
Dependent Claim
32 words
A method according to claim 18, wherein said picture quality signal corresponds to a portion of said video signal selected from a video sequence, group of pictures, picture, slice, macroblock and block.
Claim 23
Dependent Claim
16 words
A method according to claim 19, wherein said block has a size of 8 pixels×8 lines.
Claim 24
Dependent Claim
22 words
A method according to claim 18, wherein n has a value of eight and n+m has a value of eight to eleven.
Claim 25
Dependent Claim
21 words
A method according to claim 18, further comprising the step of inverse orthogonally transforming the inverse quantized direct current component coefficients.
Claim 26
Dependent Claim
27 words
A method according to claim 18, wherein said encoded direct current component coefficients include encoded luminance direct current component coefficients and encoded chrominance direct current component coefficients.
Claim 27
Independent Claim
147 words
An apparatus for decoding an encoded video signal corresponding to an original video signal having pixels represented by n bits, n being an integer, comprising: means for receiving a picture quality signal; means for selecting a decoding precision of n+m bits, m being a non-negative integer, in accordance with said picture quality signal; means for extracting encoded direct current component coefficients from said encoded video signal; means for variable length decoding only said encoded direct current component coefficients using variable length coding tables, each of said coding tables having a length that is a function of the selected decoding precision; means for obtaining an inverse difference between a first of the variable length decoded direct current component coefficients and an initial value set in accordance with the selected decoding precision; and means for inverse quantizing the inverse differentiated direct current component coefficients using the selected decoding precision.
Claim 28
Independent Claim
147 words
An apparatus for decoding an encoded video signal corresponding to an original video signal having pixels represented by n bits, n being an integer, comprising: means for receiving a picture quality signal; means for selecting a decoding precision of n+m bits, m being a non-negative integer, in accordance with said picture quality signal; means for extracting encoded direct current component coefficients from said encoded video signal; means for variable length decoding only said encoded direct current component coefficients using variable length coding tables, each of said coding tables having a length that is a function of the selected decoding precision; means for obtaining an inverse difference between a first of the variable length decoded direct current component coefficients and an initial value set in accordance with the selected decoding precision; and means for inverse quantizing the inverse differentiated direct current component coefficients using the selected decoding precision.
Claim 29
Dependent Claim
32 words
An apparatus according to claim 24, wherein said picture quality signal corresponds to a portion of said video signal selected from a video sequence, group of pictures, picture, slice, macroblock and block.
Claim 30
Dependent Claim
16 words
An apparatus according to claim 25, wherein said block has a size of 8 pixels×8 lines.
Claim 31
Dependent Claim
22 words
An apparatus according to claim 24, wherein n has a value of eight and n+m has a value of eight to eleven.
Claim 32
Dependent Claim
22 words
An apparatus according to claim 24, further comprising the step of inverse discrete cosine transforming the inverse quantized direct current component coefficients.
Claim 33
Dependent Claim
27 words
An apparatus according to claim 24, wherein said encoded direct current component coefficients include encoded luminance direct current component coefficients and encoded chrominance direct current component coefficients.
References Cited (Backward Citations)
US4984076A
Cited
US5128758A
Cited
US5198900A
Cited
US5150208A
Cited
US5337087A
Cited
US5335016A
Cited
US5157488A
Cited
US5321440A
Cited
US5309231A
Cited
US5337049A
Cited
US5369439A
Cited
US5374958A
Cited
US5402244A
Cited
US5400075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-24 | 2000-03-25 | 2000-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-24 | 2004-03-25 | 2004-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-24 | 2008-03-25 | 2008-09-24 | $7700.00 | Window Closed / Lapsed |