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EP0541295A2
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EP
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Image processing apparatus
Assignee: Canon Inc
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Filing: 1992-10-29
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Granted: —
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Expires: 2012-10-29
Abstract
Abstract An image processing apparatus extracts white component from input R,G,B colour data, suppress the white component in accordance with a non-linear characteristic, generates R,G,B,W display data and drives a liquid crystal display panel, on which R,G,B,W filters are provided, in accordance with the R,G,B,W display data, so as to display a full colour image.
Inventors
- 👤 Hiroshi c/o Canon K. K. Tanioka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 12:39
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3607; G09G2300/00; G09G2300/04; G09G2300/0439; G09G2300/0452; G09G2340/00; G09G2340/06; G09G3/2007; G09G3/2044; G09G3/2051; G09G3/2059; G09G3/3611; G09G3/3622; G09G3/3629
Claims Analysis
Total Claims: 51
Claim 1
Independent Claim
73 words
Image processing apparatus, comprising: extraction means for extracting white component data from colour data representing a colour image; generating means for generating colour display data on the basis of the colour data and the white component data, the colour display data including white display data; and display means for displaying a colour image in accordance with the colour display data, said display means displaying white pixels in accordance with the white display data.
Claim 2
Dependent Claim
16 words
Apparatus according to claim 1, wherein said display means further displays red, green and blue pixels.
Claim 3
Dependent Claim
25 words
Apparatus according to claim 1, wherein said display means has a liquid crystal display panel which is composed of a plurality of liquid crystal cells.
Claim 4
Dependent Claim
17 words
Apparatus according to claim 3, wherein said liquid crystal display panel is composed of ferroelectric liquid crystal.
Claim 5
Dependent Claim
22 words
Apparatus according to claim 1, wherein said extraction means extracts a minimum value among the colour data as the white component data.
Claim 6
Dependent Claim
24 words
Apparatus according to claim 5, wherein said extraction means detects a minimum value among red, green and blue data included in the colour data.
Claim 7
Dependent Claim
24 words
Apparatus according to claim 1, wherein said generating means generates the colour display data by removing the white component data from the colour data.
Claim 8
Dependent Claim
25 words
Apparatus according to claim 7, wherein said generating means subtracts the white component data from red, green and blue data included in the colour data.
Claim 9
Dependent Claim
61 words
Image processing apparatus, comprising: extraction means for extracting white component data from colour data representing a colour image; suppressing means for suppressing the white component data; generating means for generating colour display data on the basis of the colour data and the suppressed white component data; and display means for displaying a colour image in accordance with the colour display data.
Claim 10
Dependent Claim
19 words
Apparatus according to claim 9, wherein said display means displays white pixels in accordance with the colour display data.
Claim 11
Dependent Claim
16 words
Apparatus according to claim 10, wherein said display means further displays red, green and blue pixels.
Claim 12
Dependent Claim
25 words
Apparatus according to claim 9, wherein said display means has a liquid crystal display panel which is composed of a plurality of liquid crystal cells.
Claim 13
Dependent Claim
17 words
Apparatus according to claim 12, wherein said liquid crystal display panel is composed of ferroelectric liquid crystal.
Claim 14
Dependent Claim
20 words
Apparatus according to claim 9, wherein said suppressing means suppresses the white component data in accordance with a non-linear characteristic.
Claim 15
Dependent Claim
22 words
Apparatus according to claim 9, wherein said extracting means extracts a minimum value among the colour data as the white component data.
Claim 16
Dependent Claim
24 words
Apparatus according to claim 15, wherein said extraction means extracts a minimum value among red, green and blue data included in the colour data.
Claim 17
Dependent Claim
25 words
Apparatus according to claim 9, wherein said generating means generates the colour display data by removing the suppressed white component data from the colour data.
Claim 18
Dependent Claim
26 words
Apparatus according to claim 17, wherein said generating means subtracts the suppressed white component data from red, green and blue data included in the colour data.
Claim 19
Dependent Claim
65 words
Image processing apparatus, comprising: input means for inputting multi-level colour data representing a colour image; pseud halftone processing means for performing on the multi-level colour data a pseud halftone process to express a halftone image by controlling the rate of pixels in a unit area; and display means for displaying a colour image in accordance with the colour data subjected to the pseud halftone process.
Claim 20
Dependent Claim
23 words
Apparatus according to claim 19, wherein said display means is composed of a plurality of display elements, each of which displays binary image.
Claim 21
Dependent Claim
24 words
Apparatus according to claim 19, wherein said display means has a liquid crystal display panel which consists of a plurality of liquid crystal cells.
Claim 22
Dependent Claim
15 words
Apparatus according to claim 21, wherein each of said liquid crystal cells displays binary image.
Claim 23
Dependent Claim
17 words
Apparatus according to claim 21, wherein said liquid crystal display panel is composed of ferroelectric liquid crystal.
Claim 24
Dependent Claim
23 words
Apparatus according to claim 19, wherein said pseud halftone processing means performs the pseud halftone process in accordance with an error diffusion method.
Claim 25
Dependent Claim
34 words
Apparatus according to claim 19, wherein the multi-level colour data includes white display data, and said di.splay means displays white pixels in accordance with the white display data subjected to the pseud halftone process.
Claim 26
Dependent Claim
64 words
Image processing method, comprising: extracting white component data from colour data representing a colour image; generating colour display data on the basis of the colour data and the white component data, the colour display data including white display data; and displaying a colour image in accordance with the colour display data, the colour image comprising white pixel in accordance with the white display data.
Claim 27
Dependent Claim
19 words
Method according to claim 26, wherein the colour image is displayed by using red, green, blue and white pixels.
Claim 28
Dependent Claim
27 words
Method according to claim 26, wherein the colour image is displayed by a liquid crystal display panel which is composed of a plurality of liquid crystal cells.
Claim 29
Dependent Claim
17 words
Method according to claim 28, wherein the liquid crystal di.splay panel is composed of ferroelectric liquid crystal.
Claim 30
Dependent Claim
20 words
Method according to claim 26, wherein a minimum value among the colour data is extracted as the white component data.
Claim 31
Dependent Claim
27 words
Method according to claim 30, wherein the minimum value among red; green and blue data included in the colour data is extracted as the white component data.
Claim 32
Dependent Claim
22 words
Method according to claim 26, wherein the colour display data are generated by removing the white component data from the colour data.
Claim 33
Dependent Claim
29 words
Method according to claim 32, wherein the colour display data are generated by subtracting the white component data from red, green and blue data included in the colour data.
Claim 34
Dependent Claim
49 words
Image processing method, comprising: extracting white component data from colour data representing a colour image; suppressing the white component data; generating colour display data on the basis of the colour data and the suppressed white component data; and displaying a colour image in accordance with the colour display data.
Claim 35
Dependent Claim
19 words
Method according to claim 34, wherein the colour image is displayed by using red, green, blue and white pixels.
Claim 36
Dependent Claim
27 words
Method according to claim 34, wherein the colour image is displayed by a liquid crystal display panel which is composed of a plurality of liquid crystal cells.
Claim 37
Dependent Claim
17 words
Method according to claim 36, wherein the liquid crystal display panel is composed of ferroelectric liquid crystal.
Claim 38
Dependent Claim
17 words
Method according to claim 34, wherein the white component is suppressed in accordance with a non-linear characteristic.
Claim 39
Dependent Claim
20 words
Method according to claim 34, wherein a minimum value among the colour data is extracted as the white component data.
Claim 40
Dependent Claim
27 words
Method according to claim 39, wherein the minimum value among red, green and blue data included in the colour data is extracted as the white component data.
Claim 41
Dependent Claim
23 words
Method according to claim 34, wherein the colour display data are generated by removing the suppressed white component data from the colour data.
Claim 42
Dependent Claim
30 words
Method according to claim 41, wherein the colour display data are generated by subtracting the suppressed white component data from red, green and blue data included in the colour data.
Claim 43
Dependent Claim
54 words
Image processing method, comprising: inputting multi-level colour data representing a colour image; performing on the multi-level colour data a pseud halftone process to express a halftone image by controlling the rate of pixels in a unit area; and displaying a colour image in accordance with the colour data subjected to the pseud halftone process.
Claim 44
Dependent Claim
24 words
Method according to claim 42, wherein the colour image is displayed by a plurality of display elements, each of which displays a binary image.
Claim 45
Dependent Claim
27 words
Method according to claim 43, wherein the colour image is displayed by a liquid crystal display panel which is composed of a plurality of liquid crystal cells.
Claim 46
Dependent Claim
16 words
Method according to claim 45, wherein each of said liquid crystal cells displays a binary image.
Claim 47
Dependent Claim
17 words
Method according to claim 45, wherein said liquid crystal display panel is composed of ferroelectric liquid crystal.
Claim 48
Dependent Claim
19 words
Method according to claim 43, wherein the pseud halftone process is performed in accordance with an error diffusion method.
Claim 49
Dependent Claim
81 words
Image processing apparatus, comprising: input means for inputting colour data representing a colour image; processing means for processing the colour data to produce colour display data; and display means for displaying a colour image on the basis of the colour display data; characterised in that said display means displays the colour image using a plurality of two level pixels, and that said processing means produces the colour display data which expresses halftone images by using the plurality of two level pixels.
Claim 50
Dependent Claim
63 words
Apparatus according to claim 49, wherein said processing means comprises: extraction means for extracting white component data from the colour data; and generating means for generating colour display data on the basis of the colour data and the white component data, the colour display data including white display data, and said display means displays white pixels in accordance with the white display data.
Claim 51
Dependent Claim
39 words
Apparatus according to claim 49, wherein said processing means comprises: pseud halftone processing means for performin on the colour data a pseud halftone process to express a halftone image by controlling the number of pixels in a unit area.
References Cited (Backward Citations)
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