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Patent US5341441A successfully refreshed from Google Patents.
US5341441A
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US
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Method and apparatus for coding image information, and method of creating code books
Assignee: Canon Inc
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Filing: 1993-01-11
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Granted: 1994-08-23
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Expires: 2013-01-11
Abstract
Abstract A coding apparatus divides digital image information into pixel blocks each having a size of m×n pixels, and subjects the image information to vector quantization in block units. The pixel blocks are orthogonally transformed and the characteristics and sequency components of the pixel blocks are detected. Each pixel block is divided into a plurality of sub-blocks in conformity with the detected sequency components. Respective ones of the plurality of divided and outputted sub-blocks are scalar-quantized into sub-vectors of a predetermined number of bits in conformity with the characteristics of the pixel blocks. Respective ones of the scalar-quantized values of the quantized sub-blocks are vector-quantized in conformity with the characteristics of the pixel blocks, these vector-quantized reproduction vector codes are combined and the result is subjected to further vector quantization.
Inventors
- 👤 Mitsuru Maeda
- 👤 Tadashi Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:13
CPC Classifications
G; G06; G06T; G06T9/00; G06T9/008; H; H04; H04N; H04N19/00; H04N19/10; H04N19/134; H04N19/154; H04N19/90; H04N19/94; H04N19/60
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
161 words
An image processing apparatus comprising: generating means for generating luminance information and chrominance information representing an image; first dividing means for dividing the luminance information and the chrominance information into a plurality of luminance blocks and a plurality of chrominance blocks, respectively, wherein the luminance blocks have luminance information corresponding to a plurality of pixels and the chrominance blocks have chrominance information corresponding to a plurality of pixels; second dividing means for dividing each of said chrominance blocks into a plurality of sub-blocks; reducing means for reducing the amount of the chrominance information by extracting a representative chrominance value of each of said sub-blocks; detecting means for detecting a feature of the image in accordance with the luminance information generated by said generating means and outputting a detection signal representing the feature of the image; and encoding means for encoding the representative chrominance value of each of said sub-blocks based on the feature of the image represented by the detection signal.
Claim 2
Dependent Claim
161 words
An image processing apparatus comprising: generating means for generating luminance information and chrominance information representing an image; first dividing means for dividing the luminance information and the chrominance information into a plurality of luminance blocks and a plurality of chrominance blocks, respectively, wherein the luminance blocks have luminance information corresponding to a plurality of pixels and the chrominance blocks have chrominance information corresponding to a plurality of pixels; second dividing means for dividing each of said chrominance blocks into a plurality of sub-blocks; reducing means for reducing the amount of the chrominance information by extracting a representative chrominance value of each of said sub-blocks; detecting means for detecting a feature of the image in accordance with the luminance information generated by said generating means and outputting a detection signal representing the feature of the image; and encoding means for encoding the representative chrominance value of each of said sub-blocks based on the feature of the image represented by the detection signal.
Claim 3
Dependent Claim
18 words
The image processing apparatus according to claim 1, wherein said reducing means calculates mean values of the sub-blocks.
Claim 4
Dependent Claim
31 words
The image processing apparatus according to claim 1, further comprising: second encoding means for encoding the luminance information in accordance with the feature of the image detected by said detecting means.
Claim 5
Dependent Claim
24 words
The image processing apparatus according to claim 3, wherein said encoding means and said second encoding means encode by using a common encoding method.
Claim 6
Dependent Claim
26 words
The image processing apparatus according to claim 1, wherein said encoding means includes a look-up-table for encoding the representative chrominance value of each of said sub-blocks.
Claim 7
Dependent Claim
23 words
The image processing apparatus according to claim 1, wherein said detecting means includes orthogonal transform means for detecting the feature of the image.
Claim 8
Dependent Claim
21 words
The image processing apparatus according to claim 1, wherein the feature of an image relates to edge information of the image.
Claim 9
Dependent Claim
153 words
An image processing method comprising the steps of: generating luminance information and chrominance information representing an image; a first dividing step for dividing the luminance information and the chrominance information into a plurality of luminance blocks and a plurality of chrominance blocks, respectively, wherein each of the luminance blocks has luminance information corresponding to a plurality of pixels and each of the chrominance blocks has chrominance information corresponding to a plurality of pixels; a second dividing step for dividing each of said chrominance blocks into a plurality of sub-blocks; reducing the amount of the chrominance information by extracting a representative chrominance value of each of said sub-blocks; detecting a feature of the image in accordance with the luminance information and generating a detection signal representing the feature of the image; and encoding the representative chrominance value of each of said sub-blocks based on the feature of the image represented by the detection signal.
Claim 10
Dependent Claim
153 words
An image processing method comprising the steps of: generating luminance information and chrominance information representing an image; a first dividing step for dividing the luminance information and the chrominance information into a plurality of luminance blocks and a plurality of chrominance blocks, respectively, wherein each of the luminance blocks has luminance information corresponding to a plurality of pixels and each of the chrominance blocks has chrominance information corresponding to a plurality of pixels; a second dividing step for dividing each of said chrominance blocks into a plurality of sub-blocks; reducing the amount of the chrominance information by extracting a representative chrominance value of each of said sub-blocks; detecting a feature of the image in accordance with the luminance information and generating a detection signal representing the feature of the image; and encoding the representative chrominance value of each of said sub-blocks based on the feature of the image represented by the detection signal.
Claim 11
Dependent Claim
20 words
The image processing method according to claim 8, wherein mean values of the sub-blocks are calculated in said reducing step.
Claim 12
Dependent Claim
27 words
The image processing method according to claim 8, further comprising a second encoding step for encoding the luminance information in accordance with the feature of the image.
Claim 13
Dependent Claim
25 words
The image processing method according to claim 10, wherein said encoding step and said second encoding step are performed by using a common encoding method.
Claim 14
Dependent Claim
29 words
The image processing method according to claim 8, wherein said encoding step is performed by using a look-up-table for encoding the representative chrominance value of each of said sub-blocks.
Claim 15
Dependent Claim
24 words
The image processing method according to claim 8, wherein said detecting step includes an orthogonal transforming step for detecting the feature of the image.
Claim 16
Dependent Claim
21 words
The image processing method according to claim 8, wherein the feature of an image relates to edge information of the image.
References Cited (Backward Citations)
US4633296A
Cited
US4700399A
Cited
US4719490A
Cited
US4772946A
Cited
US4829376A
Cited
US4887151A
Cited
US4845559A
Cited
EP0276603A1
Cited
US4853779A
Cited
US4933761A
Cited
US4974071A
Cited
US4922508A
Cited
US4965580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-08-22 | 1998-02-21 | 1998-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-22 | 2002-02-21 | 2002-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-22 | 2006-02-21 | 2006-08-23 | $7700.00 | Window Closed / Lapsed |