US4887151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encoding apparatus for color image data with block-by-block individual quantizing or individual encoding of luminosity, structure, and color information
Assignee: Canon Inc
•
Filing: 1989-04-19
•
Granted: 1989-12-12
•
Expires: 2009-04-19
Abstract
Abstract There is disclosed an apparatus for efficient and faithful encoding of color image data, by dividing color image data into blocks, extracting luminosity information, structure information and color information from each block, and for each block, individually encoding or individually quantizing the color image the structure information and the luminosity information. The signal system may be one employing signals of low mutual correlation, such as an L*a*b* signal system. An orthogonal transformation of the L* components of the color image data for the respective blocks may be performed.
Inventors
- 👤 Masafumi Wataya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:35
CPC Classifications
H; H04; H04N; H04N11/00; H04N11/04; H04N11/042; G; G06; G06T; G06T9/00; G06T9/007; H04N1/00; H04N1/46; H04N1/64; H04N1/642; H04N19/00; H04N19/60
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
75 words
A color image data encoding apparatus comprising: dividing means for dividing color image data into blocks; extraction means for extracting luminosity information relating to the light level of each block, structure information relating to the structure of each block, and color information relating to the color of each block; and encoding means for encoding said color image data, said encoding means individually encoding the luminosity information, the structure information and the color information thus extracted.
Claim 2
Dependent Claim
75 words
A color image data encoding apparatus comprising: dividing means for dividing color image data into blocks; extraction means for extracting luminosity information relating to the light level of each block, structure information relating to the structure of each block, and color information relating to the color of each block; and encoding means for encoding said color image data, said encoding means individually encoding the luminosity information, the structure information and the color information thus extracted.
Claim 3
Dependent Claim
27 words
A color image data encoding apparatus according to claim 1, wherein said color image data are represented by a signal system employing signals of low mutual correlation.
Claim 4
Dependent Claim
22 words
A color image data encoding apparatus according to claim 2, wherein said color image data are represented by an L*a*b* signal system.
Claim 5
Dependent Claim
51 words
A color image data encoding apparatus according to claim 3, wherein said extraction means comprises orthogonal transformation means and is adapted to effect an orthogonal transformation on the L* component of the color image data of each block and to extract said luminosity information and said structure information from each block.
Claim 6
Dependent Claim
20 words
A color image data encoding apparatus according to claim 4, wherein said orthogonal transformation means carries out a Hadamard transformation.
Claim 7
Dependent Claim
36 words
A color image data encoding apparatus according to claim 3, further comprising conversion means for converting color image data represented by an RGB signal system to the color image data represented by the L*a*b* signal system.
Claim 8
Dependent Claim
21 words
A color image data encoding apparatus according to claim 1, wherein said structure information is information related to an image edge.
Claim 9
Dependent Claim
26 words
A color image data encoding apparatus according to claim 1, wherein said encoding means individually vector-quantizes the luminosity information, the structure information and the color information.
Claim 10
Dependent Claim
78 words
A color image data encoding apparatus comprising: dividing means for dividing color image data into blocks; extraction means for extracting luminosity information relating to the light level of each block, structure information relating to the structure of each block, and color information relating to the color of each block; quantizing means for individually quantizing the luminosity information, the structure information and the color information thus extracted; and process means for processing the luminosity or color information thus quantized.
Claim 11
Dependent Claim
78 words
A color image data encoding apparatus comprising: dividing means for dividing color image data into blocks; extraction means for extracting luminosity information relating to the light level of each block, structure information relating to the structure of each block, and color information relating to the color of each block; quantizing means for individually quantizing the luminosity information, the structure information and the color information thus extracted; and process means for processing the luminosity or color information thus quantized.
Claim 12
Dependent Claim
24 words
A color image data encoding apparatus according to claim 9, wherein said process means is adapted to vary a value of said luminosity information.
Claim 13
Dependent Claim
41 words
A color image data encoding apparatus according to claim 9 wherein said color information comprises hue and saturation information for each block, and said process means is adapted to vary a value of hue or saturation represented by said color information.
Claim 14
Dependent Claim
27 words
A color image data encoding apparatus according to claim 9, wherein said color image data are represented by a signal system employing signals of low mutual correlation.
Claim 15
Dependent Claim
22 words
A color image data encoding apparatus according to claim 12, wherein said color image data are represented by an L*a*b* signal system.
Claim 16
Dependent Claim
36 words
A color image data encoding apparatus according to claim 13, further comprising conversion means for converting color image data represented by an RGB signal system to the color image data represented by the L*a*b* signal system.
Claim 17
Dependent Claim
51 words
A color image data encoding apparatus according to claim 13, wherein said extraction means comprises orthogonal transformation means and is adapted to effect an orthogonal transformation on the L* component of the color image data of each block and to extract said luminosity information and said structure information from each block.
Claim 18
Dependent Claim
20 words
A color image data encoding apparatus according to claim 15, wherein said orthogonal transformation means carries out a Hadamard transformation.
Claim 19
Dependent Claim
26 words
A color image data encoding apparatus according to claim 9, wherein said quantizing means individually vector-quantizes the luminosity information, the structure information and the color information.
References Cited (Backward Citations)
JPS54102825A
Cited
US4553172A
Cited
JPS59110274A
Cited
US4646134A
Cited
US4786975A
Cited
US4797945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |