US5909505A
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Color image encoding method and apparatus
Assignee: Canon Inc
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Filing: 1997-03-04
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Granted: 1999-06-01
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Expires: 2017-03-04
Abstract
Abstract This invention relates to an image processing apparatus having a function of encoding or decoding image data and discloses a technique for extracting an image feature, especially a thin image portion of a specific color of an image, and for encoding the thin image portion with high efficiency to minimize degradation of image quality by selecting an appropriate encoding method.
Inventors
- 👤 Akihiro Katayama
- 👤 Yasuhiko Yasuda
- 👤 Shigeo Kato
- 👤 Hirokazu Uchio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:59
CPC Classifications
G; G06; G06T; G06T9/00; H; H04; H04N; H04N1/00; H04N1/46; H04N1/64; H04N1/642; H04N11/00; H04N11/04; H04N11/042; H04N11/044; H04N19/00; H04N19/30
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
93 words
A color image encoding apparatus, comprising: input means for inputting a color image; separation means for separating out from the input image, a color character image and an image other than the color character image; first encoding means for encoding the color character image using a first encoding method suitable for a color character; second encoding means for encoding the image other than the color character image using a second encoding method different from the first encoding method; and transmission means for transmitting encoded data encoded by said first and second encoding means.
Claim 2
Dependent Claim
93 words
A color image encoding apparatus, comprising: input means for inputting a color image; separation means for separating out from the input image, a color character image and an image other than the color character image; first encoding means for encoding the color character image using a first encoding method suitable for a color character; second encoding means for encoding the image other than the color character image using a second encoding method different from the first encoding method; and transmission means for transmitting encoded data encoded by said first and second encoding means.
Claim 3
Dependent Claim
14 words
An apparatus according to claim 1, wherein said first encoding means performs binary encoding.
Claim 4
Dependent Claim
14 words
An apparatus according to claim 2, wherein said first encoding means performs arithmetic encoding.
Claim 5
Dependent Claim
24 words
An apparatus according to claim 2, wherein said first encoding means performs MH (modified Huffman), MR (modified READ) or MMR (modified modified READ) encoding.
Claim 6
Dependent Claim
14 words
An apparatus according to claim 1, wherein said second encoding means performs multivalue encoding.
Claim 7
Dependent Claim
15 words
An apparatus according to claim 4, wherein said second encoding means performs orthogonal transformation encoding.
Claim 8
Dependent Claim
98 words
A color image encoding method, comprising: an input step of inputting a color image; a separation step of separating out from the input image, a color character image and an image other than the color character image; a first encoding step of encoding the color character image using a first encoding method suitable for a color character; a second encoding step of encoding the image other than the color character image using a second encoding method different from the first encoding method; and a transmission step of transmitting encoded data encoded in said first and second encoding steps.
Claim 9
Dependent Claim
98 words
A color image encoding method, comprising: an input step of inputting a color image; a separation step of separating out from the input image, a color character image and an image other than the color character image; a first encoding step of encoding the color character image using a first encoding method suitable for a color character; a second encoding step of encoding the image other than the color character image using a second encoding method different from the first encoding method; and a transmission step of transmitting encoded data encoded in said first and second encoding steps.
Claim 10
Dependent Claim
89 words
A color image encoding apparatus, comprising: input means for inputting a color character image and an image other than the color character image, both images contained in a same color image; first encoding means for encoding the color character image using a first encoding method suitable for a color character; second encoding means for encoding the image other than the color character image using a second encoding method different from the first encoding method; and transmission means for transmitting encoded data encoded by said first and second encoding means.
Claim 11
Dependent Claim
89 words
A color image encoding apparatus, comprising: input means for inputting a color character image and an image other than the color character image, both images contained in a same color image; first encoding means for encoding the color character image using a first encoding method suitable for a color character; second encoding means for encoding the image other than the color character image using a second encoding method different from the first encoding method; and transmission means for transmitting encoded data encoded by said first and second encoding means.
Claim 12
Dependent Claim
14 words
An apparatus according to claim 8, wherein said first encoding means performs binary encoding.
Claim 13
Dependent Claim
14 words
An apparatus according to claim 9, wherein said first encoding means performs arithmetic encoding.
Claim 14
Dependent Claim
24 words
An apparatus according to claim 9, wherein said first encoding means performs MH (modified Huffman), MR (modified READ) or MMR (modified modified READ) encoding.
Claim 15
Dependent Claim
14 words
An apparatus according to claim 8, wherein said second encoding means performs multivalue encoding.
Claim 16
Dependent Claim
15 words
An apparatus according to claim 12, wherein said second encoding means performs orthogonal transformation encoding.
Claim 17
Dependent Claim
93 words
A color image encoding method, comprising: an input step of inputting a color character image and an image other than the color character image, both images contained in a same color image; a first encoding step of encoding the color character image using a first encoding method suitable for a color character; a second encoding step of encoding the image other than the color character image using a second encoding method different from the first encoding method; and a transmission step of transmitting encoded data encoded in said first and second encoding steps.
Claim 18
Dependent Claim
93 words
A color image encoding method, comprising: an input step of inputting a color character image and an image other than the color character image, both images contained in a same color image; a first encoding step of encoding the color character image using a first encoding method suitable for a color character; a second encoding step of encoding the image other than the color character image using a second encoding method different from the first encoding method; and a transmission step of transmitting encoded data encoded in said first and second encoding steps.
Claim 19
Dependent Claim
93 words
A color image decoding apparatus, comprising: input means for inputting a color character image and an image other than the color character image, the color character image being encoded using a first encoding method and the image other than the color character image being encoded using a second encoding method different from the first encoding method; decoding means for decoding the color character image and the image other than the color character image; and synthesizing means for synthesizing the decoded color character image and the decoded image other than the color character image.
Claim 20
Dependent Claim
93 words
A color image decoding apparatus, comprising: input means for inputting a color character image and an image other than the color character image, the color character image being encoded using a first encoding method and the image other than the color character image being encoded using a second encoding method different from the first encoding method; decoding means for decoding the color character image and the image other than the color character image; and synthesizing means for synthesizing the decoded color character image and the decoded image other than the color character image.
Claim 21
Dependent Claim
14 words
An apparatus according to claim 15, wherein said first encoding means performs binary encoding.
Claim 22
Dependent Claim
14 words
An apparatus according to claim 16, wherein said first encoding means performs arithmetic encoding.
Claim 23
Dependent Claim
24 words
An apparatus according to claim 16, wherein said first encoding means performs MH (modified Huffman), MR (modified READ) or MMR (modified modified READ) encoding.
Claim 24
Dependent Claim
14 words
An apparatus according to claim 15, wherein said second encoding means performs multivalue encoding.
Claim 25
Dependent Claim
15 words
An apparatus according to claim 19, wherein said second encoding means performs orthogonal transformation encoding.
Claim 26
Dependent Claim
96 words
A color image decoding method, comprising: an input step of inputting a color character image and an image other than the color character image, the color character image being encoded using a first encoding method and the image other than the color character image being encoded using a second encoding method different from the first encoding method; a decoding step of decoding the color character image and the image other than the color character image; and a synthesizing step of synthesizing the decoded color character image and the decoded image other than the color character image.
Claim 27
Dependent Claim
96 words
A color image decoding method, comprising: an input step of inputting a color character image and an image other than the color character image, the color character image being encoded using a first encoding method and the image other than the color character image being encoded using a second encoding method different from the first encoding method; a decoding step of decoding the color character image and the image other than the color character image; and a synthesizing step of synthesizing the decoded color character image and the decoded image other than the color character image.
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