Patent EP0416833A2 successfully refreshed from Google Patents.
EP0416833A2
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Color image encoding
Assignee: Canon Inc
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Filing: 1990-09-03
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Granted: —
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Expires: 2010-09-03
Abstract
Abstract Color image encoding method to encode color image signals expressed by plural number of color component signals is disclosed. Color image signals are encoded only for n number of colors out of the total m bit color signals and thus the color image of such n number of colors can be efficiently encoded without largely modifying the hardware of m bit color image encoding system.
Inventors
- 👤 Yasuji C/O Canon Kabushiki Kaisha Hirabayashi
- 👤 Hidefumi C/O Canon Kabushiki Kaisha Ohsawa
- 👤 Tadashi C/O Canon Kabushiki Kaisha Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 14:48
CPC Classifications
G; G06; G06T; G06T9/00; G06T9/005; H; H04; H04N; H04N1/00; H04N1/41; H04N1/411; H04N1/413; H04N1/417; H04N1/46; H04N1/64; H04N1/648
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
67 words
Color image encoding method to encode color image signal expressed by plural number of color components signals which is characterized in that plural number of color component signals are input dot-sequentially, encoding conditions are sequentially determined in relation to each color component signal to be input dot-sequentially, and each color component signal to be input dot-sequentially is encoded according to the encoding conditions to be determined sequentially.
Claim 2
Dependent Claim
67 words
Color image encoding method to encode color image signal expressed by plural number of color components signals which is characterized in that plural number of color component signals are input dot-sequentially, encoding conditions are sequentially determined in relation to each color component signal to be input dot-sequentially, and each color component signal to be input dot-sequentially is encoded according to the encoding conditions to be determined sequentially.
Claim 3
Dependent Claim
13 words
A method according to Claim 1 wherein the said encoding is prediction encoding.
Claim 4
Dependent Claim
18 words
A method according to Claim 2 wherein the said determination is the determination of the conditions for prediction.
Claim 5
Dependent Claim
28 words
A method according to Claim 1 wherein the said input is the dot-sequential input of color component signals of three colors, red (R), green (G) and blue (B).
Claim 6
Dependent Claim
77 words
Color image encoding method to encode color image signals expressed by plural number of color component signals which is characterized in that the color component signal to be encoded and color component signals other than the one to be encoded are used for reference, color component signal to be encoded is predicted according to the color component signals to be referred to and color component signal to be encoded is encoded utilizing the predicted color component signal.
Claim 7
Dependent Claim
77 words
Color image encoding method to encode color image signals expressed by plural number of color component signals which is characterized in that the color component signal to be encoded and color component signals other than the one to be encoded are used for reference, color component signal to be encoded is predicted according to the color component signals to be referred to and color component signal to be encoded is encoded utilizing the predicted color component signal.
Claim 8
Dependent Claim
21 words
A method according to Claim 5 wherein the said reference means to refer also to the color component signal already encoded.
Claim 9
Dependent Claim
20 words
A method according to Claim 5 wherein the said encoding means to encode plural number of color component signals dot-sequentially.
Claim 10
Dependent Claim
25 words
A method according to Claim 5 wherein plural number of color component signals are those of three colors, red (R), green (G) and blue (B).
Claim 11
Dependent Claim
71 words
Color image encoding method to encode color image signals expressed by plural number of color component signals, which is characterized in that the difference between a specific color component signal and other color component signals is obtained and the specific color component signal is encoded as it is while for other color component signals, the differences between the said specific color component signal and the said other component signals are encoded.
Claim 12
Dependent Claim
71 words
Color image encoding method to encode color image signals expressed by plural number of color component signals, which is characterized in that the difference between a specific color component signal and other color component signals is obtained and the specific color component signal is encoded as it is while for other color component signals, the differences between the said specific color component signal and the said other component signals are encoded.
Claim 13
Dependent Claim
13 words
A method according to Claim 9 wherein the said encoding is prediction encoding.
Claim 14
Dependent Claim
21 words
A method according to Claim 9 wherein the said encoding is executed by encoding plural number of color component signals plane-sequentially.
Claim 15
Dependent Claim
26 words
A method according to Claim 9 wherein the plural number of color component signals are those of three colors, red (R), green (G) and blue (B).
Claim 16
Dependent Claim
88 words
Color image encoding method to encode color image signals expressed by plural number of color component signals which is characterized in that plural number of color component signals expressing a number of colors for encoding less in number than the number of colors that can be expressed by plural number of color component signals, the input plural number of color signals are converted into other plural number of signals which enable to discriminate the color to be encoded and thus converted other plural number of signals are encoded.
Claim 17
Dependent Claim
88 words
Color image encoding method to encode color image signals expressed by plural number of color component signals which is characterized in that plural number of color component signals expressing a number of colors for encoding less in number than the number of colors that can be expressed by plural number of color component signals, the input plural number of color signals are converted into other plural number of signals which enable to discriminate the color to be encoded and thus converted other plural number of signals are encoded.
Claim 18
Dependent Claim
13 words
A method according to Claim 13 wherein the said encoding is prediction encoding.
Claim 19
Dependent Claim
21 words
A method according to Claim 13 wherein the said encoding is executed by encoding plural number of color component signals dot-sequentially.
Claim 20
Dependent Claim
25 words
A method according to Claim 13, wherein plural number of color component signals are those of three colors, red (R), green (G) and blue (B).
Claim 21
Independent Claim
20 words
A method of encoding a color image characterised in that it utilises the correlation between the colors of the image.
Claim 22
Independent Claim
20 words
A method of encoding a color image characterised in that it utilises the correlation between the colors of the image.
Claim 23
Independent Claim
24 words
A method of encoding a color image comprising a plurality of color pixels, comprising interleaving the pixels of different colors into a bit stream.
Claim 24
Independent Claim
24 words
A method of encoding a color image comprising a plurality of color pixels, comprising interleaving the pixels of different colors into a bit stream.
Claim 25
Independent Claim
22 words
A method of encoding a color image in which colors are encoded by predictive encoding, by estimation from values of other colors.
Claim 26
Independent Claim
22 words
A method of encoding a color image in which colors are encoded by predictive encoding, by estimation from values of other colors.
Claim 27
Independent Claim
27 words
A method of encoding a color image by predictive encoding, in which each color component is encoded by prediction from a previous portion of another color signal.
Claim 28
Independent Claim
27 words
A method of encoding a color image by predictive encoding, in which each color component is encoded by prediction from a previous portion of another color signal.
Claim 29
Dependent Claim
19 words
A method according to claim 20, in which the portion of the other color signal is selected during encoding.
Claim 30
Independent Claim
33 words
A method of encoding a line scanned color image, in which one color component is predictively encoded on the basis of a value from a succeeding part of the line of another color.
Claim 31
Independent Claim
33 words
A method of encoding a line scanned color image, in which one color component is predictively encoded on the basis of a value from a succeeding part of the line of another color.
Claim 32
Independent Claim
12 words
A method according to any preceding claim, employing a dynamic arithmetical code.
Claim 33
Independent Claim
44 words
A method of encoding a multicolour image, in which, after encoding a first portion of a first color, corresponding portions of further colors are encoded by the calculation of differences between the first portion and those portions, so as to exploit the correlation therebetween.
Claim 34
Independent Claim
44 words
A method of encoding a multicolour image, in which, after encoding a first portion of a first color, corresponding portions of further colors are encoded by the calculation of differences between the first portion and those portions, so as to exploit the correlation therebetween.
Claim 35
Dependent Claim
15 words
An encoder for encoding a color image employing the method according to any preceding claim.
Claim 36
Dependent Claim
20 words
A decoder for decoding a color image signal which has been encoded using a method according to any preceding claim.
Claim 37
Dependent Claim
14 words
A color facsimile image transmitter employing an encoding method according to any preceding claim.
Claim 38
Dependent Claim
16 words
A color facsimile image receiver arranged to decode an image encoded according to any preceding claim.
References Cited (Backward Citations)
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