Patent EP0711069A1 successfully refreshed from Google Patents.
EP0711069A1
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EP
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Image processing method and apparatus
Assignee: Canon Inc
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Filing: 1995-11-03
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Granted: —
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Expires: 2015-11-03
Abstract
Abstract The present invention intends to encode a palette image effectively. The encoding method of a palette image represented by a palette composed of the limited number of colors or gradations and a two-dimensional arrangement of an index of the palette, comprises steps of sorting the palette in a predetermined order, (i.e. re-arranging the order of the palette on the basis of the luminance of each colour contained in the palette) storing correspondence of the index of the palette to the predetermined order, and encoding the palette image every bit plane of each index of the palette on the basis of the correspondence.
Inventors
- 👤 Yasuji C/O Canon K.K. Hirabayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 13:29
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/64; H04N1/644
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
62 words
An image processing method comprising the steps of: generating palette data which defines the relationship between an index number and a plurality of color component data; converting an input color image into a palette image by using the palette data; and outputting the palette image, wherein the index number has a correlation with lightness information of the plurality of color component data.
Claim 2
Dependent Claim
21 words
A method according to claim 1, wherein the palette data is stored in a memory in a form of look-up table.
Claim 3
Dependent Claim
17 words
A method according to claim 1, wherein the input color image is supplied from an external device.
Claim 4
Dependent Claim
20 words
A method according to claim 1, further comprising the step of encoding the palette image in a predetermined encoding method.
Claim 5
Dependent Claim
16 words
A method according to claim 4, wherein the predetermined encoding method is a loss-less encoding method.
Claim 6
Dependent Claim
24 words
A method according to claim 4, wherein the predetermined encoding method is an encoding method for encoding the index number for each bit plane.
Claim 7
Dependent Claim
16 words
A method according to claim 6, wherein the predetermined encoding method is a binary encoding method.
Claim 8
Dependent Claim
68 words
An image processing apparatus comprising: generating means for generating palette data which defines the relationship between an index number and a plurality of color component data; converting means for converting an input color image into a palette image by using the palette data; and output means for outputting the palette image, wherein the index number has a correlation with lightness information of the plurality of color component data.
Claim 9
Dependent Claim
76 words
An image processing method for processing a palette image represented by a palette composed of the limited number of colors or gradations and a two-dimensional arrangement of an index of the palette, comprising the steps of: re-arranging the palette in a predetermined order; storing correspondence of the index of the palette to the predetermined order; and encoding the palette image for each bit plane of each index of the palette on the basis of the correspondence.
Claim 10
Dependent Claim
18 words
A method according to claim 9, wherein the predetermined order is an order according to luminance or lightness.
Claim 11
Dependent Claim
14 words
A method according to claim 9, wherein the encoding is a binary reversible encoding.
Claim 12
Dependent Claim
17 words
A method according to claim 9, wherein the correspondence is stored in a form of look-up table.
Claim 13
Dependent Claim
24 words
A method according to claim 9, wherein the palette image is encoded after performing a gray encoding on the basis of the predetermined order.
Claim 14
Dependent Claim
82 words
An image processing apparatus for processing a palette image represented by a palette composed of the limited number of colors or gradations and a two-dimensional arrangement of an index of the palette, comprising: re-arranging means for re-arranging the palette in a predetermined order; storage means for storing correspondence of the index of the palette to the predetermined order; and encoding means for encoding the palette image for each bit plane of each index of the palette on the basis of the correspondence.
Claim 15
Dependent Claim
24 words
Apparatus for processing digital colour image data in which luminance data from the image data is used in the generation of a palette image.
References Cited (Backward Citations)
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