US5157488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive quantization within the jpeg sequential mode
Assignee: International Business Machines Corp
•
Filing: 1991-05-17
•
Granted: 1992-10-20
•
Expires: 2011-05-17
Abstract
Abstract A system and method for masking adaptive quantization during compressed image data transmission by defining a scaling factor for the quantization tables of the multiple image components, wherein the scaling factor signals changes in quantization for successive blocks of the image data. The scaling factor is transmitted as a further component together with the image components to thereby signal adaptive quantization of the image data.
Inventors
- 👤 William B. Pennebaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:15
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/10; H04N19/102; H04N19/124; H04N19/126; H04N19/50; H04N19/593; H04N19/30; H04N19/60
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
93 words
A method for masking adaptive quantization during compressed image data transmission in a system for transmitting blocks of data representing multiple components of an image, comprising the steps of: generating a quantization table for each of the multiple image components; defining a common scaling factor for a portion of said quantization tables of the multiple image components; and signaling changes in quantization for successive blocks of the image data by transmitting said common scaling factor as a further component together with the image components to thereby signal adaptive quantization of the image data.
Claim 2
Independent Claim
93 words
A method for masking adaptive quantization during compressed image data transmission in a system for transmitting blocks of data representing multiple components of an image, comprising the steps of: generating a quantization table for each of the multiple image components; defining a common scaling factor for a portion of said quantization tables of the multiple image components; and signaling changes in quantization for successive blocks of the image data by transmitting said common scaling factor as a further component together with the image components to thereby signal adaptive quantization of the image data.
Claim 3
Dependent Claim
55 words
A method according to claim 1, further comprising the steps of: defining a separate scaling factor for each value in a portion of said quantization tables of the multiple image components; and transmitting said separate scaling factors as said further component together with the image components to thereby signal adaptive quantization of the image data.
Claim 4
Dependent Claim
31 words
A method according to claim 1, wherein said defining is done by coding changes in scaling such that said common scaling factor is the DC coefficients in a further image component.
Claim 5
Dependent Claim
36 words
A method according to claim 2, wherein said defining is done by coding changes in each separate scaling factor such that said differences in scaling factors are the corresponding AC coefficients in a further image component.
Claim 6
Dependent Claim
31 words
A method according to claim 2, wherein said defining is done by coding in each separate scaling factor such that it is a corresponding AC coefficient in a further image component.
Claim 7
Independent Claim
93 words
A method for masking adaptive quantization during compressed image data transmission in a system for transmitting blocks of data representing luminance-chrominance components of an image, comprising the steps of: generating a quantization table for each of the luminance-chrominance image components; defining a common scaling factor for a portion of said quantization tables of the luminance-chrominance image components; and signaling changes in quantization for successive blocks of the image data by transmitting said common scaling factor as a further component together with the luminance-chrominance components to thereby signal adaptive quantization of the image data.
Claim 8
Independent Claim
93 words
A method for masking adaptive quantization during compressed image data transmission in a system for transmitting blocks of data representing luminance-chrominance components of an image, comprising the steps of: generating a quantization table for each of the luminance-chrominance image components; defining a common scaling factor for a portion of said quantization tables of the luminance-chrominance image components; and signaling changes in quantization for successive blocks of the image data by transmitting said common scaling factor as a further component together with the luminance-chrominance components to thereby signal adaptive quantization of the image data.
Claim 9
Dependent Claim
56 words
A method according to claim 6, further comprising the steps of: defining a separate scaling factor for each value in portions of each of said quantization tables of the luminance-chrominance image components; and transmitting said separate scaling factors as said further component together with the luminance-chrominance components to thereby signal adaptive quantization of the image data.
Claim 10
Dependent Claim
91 words
A method according to claim 7, further comprising the steps of: defining a first scaling factor for a portion of a Y quantization table of the luminance-chrominance image components; defining a second scaling factor for a portion of a Cr quantization table of the luminance-chrominance image components; defining a third scaling factor for a portion of a Cb quantization table of the luminance-chrominance image components; and transmitting said first through third scaling factors as a further component together with the luminance-chrominance components to thereby signal adaptive quantization of the image data.
Claim 11
Dependent Claim
31 words
A method according to claim 8, wherein said defining is done by coding changes in scaling such that the common scaling factor is the DC coefficients in a further image component.
Claim 12
Independent Claim
97 words
A system for masking adaptive quantization during compressed image data transmission of blocks of data representing multiple components of an image, comprising: first means for generating a quantization table for each of the multiple image components; second means for defining a common scaling factor for a portion of said quantization tables of the multiple image components, said common scaling factor signaling changes in quantization for successive blocks of the image data; and third means for transmitting said scaling factor as a further component together with the image components to thereby signal adaptive quantization of the image data.
Claim 13
Independent Claim
97 words
A system for masking adaptive quantization during compressed image data transmission of blocks of data representing multiple components of an image, comprising: first means for generating a quantization table for each of the multiple image components; second means for defining a common scaling factor for a portion of said quantization tables of the multiple image components, said common scaling factor signaling changes in quantization for successive blocks of the image data; and third means for transmitting said scaling factor as a further component together with the image components to thereby signal adaptive quantization of the image data.
Claim 14
Dependent Claim
58 words
A system according to claim 10, wherein: said second means defines a separate scaling factor for each value in portions of each of said quantization tables of the multiple image components; and said third means transmits said separate scaling factors as said further component together with the image components to thereby signal adaptive quantization of the image data.
Claim 15
Dependent Claim
35 words
A system according to claim 10, wherein said second means defines coding changes in each separate scaling factor such that said differences in scaling factors are the corresponding AC coefficients in a further image component.
Claim 16
Dependent Claim
30 words
A system according to claim 10, wherein said second means defines coding in each separate scaling factor such that it is a corresponding AC coefficient in a further image component.
Claim 17
Dependent Claim
21 words
A system according to claim 10, wherein: said scaling factors signal changes in quantization for successive blocks of luminance-chrominance image data.
Claim 18
Dependent Claim
104 words
A system according to claim 14, further comprising: fourth means for defining a first common scaling factor for a portion of a Y quantization table of the luminance-chrominance image components; fifth means for defining a second common scaling factor for a portion of a Cr quantization table of the luminance-chrominance image components; and sixth means for defining a third common scaling factor for a portion of a Cb quantization table of the luminance-chrominance image components; wherein said transmitting means transmits said first through third scaling factors as a further component together with the luminance-chrominance components to thereby signal adaptive quantization of the image data.
Claim 19
Dependent Claim
60 words
A system according to claim 15, wherein: said fourth through sixth means define a separate scaling factor for each value in portions of each of said quantization tables of the multiple image components; and said third means transmits said separate scaling factors as said further component together with the image components to thereby signal adaptive quantization of the image data.
Claim 20
Dependent Claim
32 words
A system according to claim 16, wherein said fourth through sixth means use coding changes in scaling such that said common scaling factor is the DC coefficients in a further image component.
References Cited (Backward Citations)
US4386366A
Cited
US4467346A
Cited
US4580162A
Cited
US4584597A
Cited
US4656500A
Cited
US4639778A
Cited
US4992273A
Cited
US4716453A
Cited
US4831636A
Cited
US4698689A
Cited
US4860313A
Cited
US5021879A
Cited
US5008747A
Cited
US4791483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-20 | 1996-04-20 | 1996-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-20 | 2000-04-20 | 2000-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-20 | 2004-04-20 | 2004-10-20 | $7700.00 | Window Closed / Lapsed |