US5384868A
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Image information coding apparatus
Assignee: Canon Inc
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Filing: 1992-05-12
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Granted: 1995-01-24
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Expires: 2012-05-12
Abstract
Abstract An image information coding apparatus includes a cut-out or extracting unit for cutting out image information into blocks each having a predetermined size, e.g., 4x4 pixels, a preprocessing unit such as an orthogonal transformation unit (e.g., a Hadamard transformation unit) and a scalar quantization unit for performing predetermined preprocessing of the block as a matrix, a separator for separating a plurality of components (e.g., phase information, amplitude information, and zero information) from each element of the preprocessed matrix, information quantizers for coding individual pieces of information constituted by each component, and a synthesizer for synthesizing coding results.
Inventors
- 👤 Mitsuru Maeda
- 👤 Tadashi Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:12
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/90; H04N19/94; H04N19/10; H04N19/134; H04N19/154; H04N19/60
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
135 words
A color image information coding apparatus comprising: extracting means for extracting luminance information and chrominance information from input color image information; first processing means for performing first predetermined processing for the chrominance information, said first processing means including means for reducing the amount of the chrominance information; second processing means for performing second predetermined processing for the luminance information, said second predetermined processing being different from said first predetermined processing; and output means for outputting the luminance information and the chrominance information processed by said first and second processing means, wherein said second processing means includes transforming means for blockwise transformation of the luminance information to generate frequency information, separating means for separating the frequency information into groups of frequency components, and coding means for generating code data based on said groups of frequency components.
Claim 2
Dependent Claim
135 words
A color image information coding apparatus comprising: extracting means for extracting luminance information and chrominance information from input color image information; first processing means for performing first predetermined processing for the chrominance information, said first processing means including means for reducing the amount of the chrominance information; second processing means for performing second predetermined processing for the luminance information, said second predetermined processing being different from said first predetermined processing; and output means for outputting the luminance information and the chrominance information processed by said first and second processing means, wherein said second processing means includes transforming means for blockwise transformation of the luminance information to generate frequency information, separating means for separating the frequency information into groups of frequency components, and coding means for generating code data based on said groups of frequency components.
Claim 3
Dependent Claim
14 words
An apparatus according to claim 1, wherein said transforming means performs blockwise orthogonal transformation.
Claim 4
Dependent Claim
25 words
An apparatus according to claim 2, wherein said transforming means includes a first quantizing means for performing quantization of elements of said orthogonally transformed blocks.
Claim 5
Dependent Claim
25 words
An apparatus according to claim 1, wherein the plurality of frequency components separated by said separating means are phase information, amplitude information, and noncode information.
Claim 6
Dependent Claim
25 words
An apparatus according to claim 4, wherein the phase information comprises information representing a positive/negative code or zero of each element of the preprocessed matrix.
Claim 7
Dependent Claim
20 words
An apparatus according to claim 4, wherein the amplitude information comprises an absolute value of the element of the block.
Claim 8
Dependent Claim
22 words
An apparatus according to claim 4, wherein the noncode information comprises information representing zero or nonzero of each element of said block.
Claim 9
Dependent Claim
21 words
An apparatus according to claim 4, wherein said coding means performs vector quantization of the information constituted by each frequency component.
Claim 10
Dependent Claim
112 words
A color image information coding method comprising: extracting luminance information and chrominance information from input color image information; performing first predetermined processing for the chrominance information, said first predetermined processing including reducing the amount of the chrominance information; performing second predetermined processing for the luminance information, said second predetermined processing being different from said first predetermined processing; and outputting the luminance information and the chrominance information processed by said first and second predetermined processing, wherein said second predetermined processing includes block-wise transformation of the luminance information to generate frequency information, separation of the frequency information into groups of frequency components and generation of code data based on said groups of frequency components.
Claim 11
Dependent Claim
112 words
A color image information coding method comprising: extracting luminance information and chrominance information from input color image information; performing first predetermined processing for the chrominance information, said first predetermined processing including reducing the amount of the chrominance information; performing second predetermined processing for the luminance information, said second predetermined processing being different from said first predetermined processing; and outputting the luminance information and the chrominance information processed by said first and second predetermined processing, wherein said second predetermined processing includes block-wise transformation of the luminance information to generate frequency information, separation of the frequency information into groups of frequency components and generation of code data based on said groups of frequency components.
Claim 12
Dependent Claim
15 words
A method according to claim 9, wherein said second predetermined preprocessing is an orthogonal transformation.
Claim 13
Dependent Claim
18 words
A method according to claim 9, further comprising the step of integrating coding results in said coding step.
Claim 14
Dependent Claim
19 words
A method according to claim 9, further comprising the step of obtaining an average value of said chrominance information.
Claim 15
Dependent Claim
24 words
A method according to claim 9, further comprising the step of transmitting said luminance information and said chrominance information through a single transmission channel.
Claim 16
Dependent Claim
19 words
An apparatus according to claim 1, further comprising integrating means for integrating coding results coded by said coding means.
Claim 17
Dependent Claim
20 words
An apparatus according to claim 1, further comprising integrating averaging means for obtaining an average value of the chrominance information.
Claim 18
Dependent Claim
24 words
An apparatus according to claim 1, further comprising transmitting means for transmitting the luminance information and the chrominance information through a single transmission channel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-23 | 1998-07-25 | 1999-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-23 | 2002-07-25 | 2003-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-23 | 2006-07-25 | 2007-01-24 | $7700.00 | Window Closed / Lapsed |