EP0348145A1
Expired / Lapsed
EP
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Image forming and processing apparatus
Assignee: Canon Inc
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Filing: 1989-06-20
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Granted: —
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Expires: 2009-06-20
Abstract
Abstract A color image forming apparatus (1,7,10,30,40,50,60,70,80) including a discriminating circuit for discriminating a character portion of an object color image, a color image forming device for forming a color image while changing a resolution; and a control circuit for controlling to change the resolution of the color image forming device in accordance with the discrimination result by the discriminating circuit.
Inventors
- 👤 Masatomo Shimizu
- 👤 Yoshinori Ikeda
- 👤 Tetsuya Ohnishi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 12:56
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; G; G06; G06T; G06T3/00; G06T3/40; G06T3/403; H04N1/40; H04N1/40062; H04N1/405; H04N1/4055; H04N1/4056
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
46 words
A color image processing apparatus comprising: first means for discriminating the edge portion of an object image; second means for discriminating the color component near the edge portion; and means for judging an object image in accordance with the outputs from the first and second means.
Claim 2
Dependent Claim
46 words
A color image processing apparatus comprising: first means for discriminating the edge portion of an object image; second means for discriminating the color component near the edge portion; and means for judging an object image in accordance with the outputs from the first and second means.
Claim 3
Dependent Claim
22 words
A color image processing apparatus according to claim 1, further comprising: third means for discriminating the black component of said object image.
Claim 4
Dependent Claim
30 words
A color image processing apparatus according to claim 2, wherein said judging means judges said object image in accordance with the discrimination results by said first, second and third means.
Claim 5
Dependent Claim
64 words
A color image processing apparatus according to claim 3, wherein said judging means includes: black edge judging means for judging the black edge portion of said object image in accordance with the discrimination resutls by said first, and third means; and judges said object image in accordance with the output from said black edge judging means and the discrimination result by said second means.
Claim 6
Dependent Claim
21 words
A color image processing apparatus according to claim 1, further comprising: means for reproducing said object image as a visual image.
Claim 7
Dependent Claim
28 words
A color image processing apparatus according to claim 5, wherein said reproducing means changes an image reproducing condition in accordance with the judgement result by said judging means.
Claim 8
Dependent Claim
29 words
A color image processing apparatus according to claim 1, wherein said second means is means for discriminating the color component of a plurality of pixels near an object pixel.
Claim 9
Dependent Claim
58 words
A color image processing apparatus comprising: first means for detecting the high frequency component of an object image; second means for detecting the color component of an area near an object pixel of said object image; and means for judging the characteristic of said object image in accordance with the detection results by said first and second means.
Claim 10
Dependent Claim
58 words
A color image processing apparatus comprising: first means for detecting the high frequency component of an object image; second means for detecting the color component of an area near an object pixel of said object image; and means for judging the characteristic of said object image in accordance with the detection results by said first and second means.
Claim 11
Dependent Claim
23 words
A color image processing apparatus according to claim 8, wherein said color component is the component representing the degree of chromaticity and achromaticity.
Claim 12
Dependent Claim
22 words
A color image processing apparatus according to claim 8 further comprising: third means for discriminating the black component of said object image.
Claim 13
Dependent Claim
37 words
A color image processing apparatus according to claim 10, wherein said judging means judges said object image in accordance with the detection results by said first and second detecting means and the discrimination result by third means.
Claim 14
Dependent Claim
28 words
A color image processing apparatus according to claim 8, wherein said judging means judges a character line image area and a screen image area within said object image.
Claim 15
Dependent Claim
21 words
A color image processing apparatus according to claim 8, further comprising: means for reproducing said object image as a visual image.
Claim 16
Dependent Claim
28 words
A color image processing apparatus according to claim 8, wherein said reproducing means changes an image reproducing condition in accordance with the judgement result by said judging means.
Claim 17
Dependent Claim
54 words
A color image forming apparatus comprising: means for discriminating a character portion of an object color image to be formed; means for forming a color image while changing a resolution; and means for controlling to change the resolution of said color image forming means in accordance with the discrimination result by said discriminating means.
Claim 18
Dependent Claim
54 words
A color image forming apparatus comprising: means for discriminating a character portion of an object color image to be formed; means for forming a color image while changing a resolution; and means for controlling to change the resolution of said color image forming means in accordance with the discrimination result by said discriminating means.
Claim 19
Dependent Claim
23 words
A color image forming apparatus according to claim 15, wherein said discriminating means discriminates a black character portion within said object color image.
Claim 20
Dependent Claim
41 words
A color image forming apparatus according to claim 15, wherein said controlling means controls, if said discriminating means discriminates said character portion within said object color image, to make a resolution higher than that when said character portion is not discriminated.
Claim 21
Dependent Claim
43 words
A color image forming apparatus according to claim 15, wherein said discriminating means includes: first means for discriminating a predetermined color component within said object color image; and second means for discriminating an edge of the color component discriminated by said first means.
Claim 22
Dependent Claim
49 words
A color image forming apparatus according to claim 15, wherein said color image forming means includes: means for supplying an image signal corresponding to said object color image; and an electrophotography image forming device for forming a visual image corresponding to the image signal supplied by said supplying means.
Claim 23
Dependent Claim
50 words
A color image forming apparatus according to claim 19, wherein said image forming device includes: means for pulse-width-modulating the image signal supplied by said supplying means in synchro with a predetermined synchro signal, said modulating means being adapted to change said resolution by changing the frequency of said synchro signal.
Claim 24
Dependent Claim
99 words
A color image signal processing apparatus for processing a such signal for an object image comprising, for at least one object pixel, at least one of the means (a), (b) and (c) as follows:- (a) means for discriminating an edge portion of an object image; (b) means for discriminating a color component near said edge portion; (c) means for discriminating a black component of said object image; and means for modifying a color image output signal in accordance with the results of at least said one of said means (a), (b) and (c) as determined in a correcting circuit.
Claim 25
Dependent Claim
99 words
A color image signal processing apparatus for processing a such signal for an object image comprising, for at least one object pixel, at least one of the means (a), (b) and (c) as follows:- (a) means for discriminating an edge portion of an object image; (b) means for discriminating a color component near said edge portion; (c) means for discriminating a black component of said object image; and means for modifying a color image output signal in accordance with the results of at least said one of said means (a), (b) and (c) as determined in a correcting circuit.
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