EP0327278A2
Expired / Lapsed
EP
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Color image forming apparatus and method and apparatus for processing color image
Assignee: Canon Inc
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Filing: 1989-01-27
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Granted: —
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Expires: 2009-01-27
Abstract
Abstract There are provided an image forming apparatus and method and apparatus for processing an image for the image forming apparatus, comprising: gradation reproducing means having different gradation reproducing characteristics; a color processing circuit for color processing in accordance with the gradation reproducing characteristic; and a process selecting circuit for selecting signal processes in the color processing circuit and the gradation reproducing means in accordance with an image region. Further, the color processing circuit has a masking coefficient train or UCR coefficients which are determined in accordance with the gradation reproducing characteristic. The process selecting circuit selects the signal processes in the color processing circuit and the gradation reproducing means in accordance with the image region.
Inventors
- 👤 Sono Gu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 17:12
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6072; H04N1/6027
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
71 words
A color image processing apparatus comprising: a) color processing means for color processing a color image signal supplied; b) second means which has a predetermined gradation reproducing characteristic and processes a color image in accordance with the signal which was color processed by said color processing means; and c) means for controlling a processing state of the color processing means in accordance with the gradation reproducing characteristic of said second means.
Claim 2
Dependent Claim
71 words
A color image processing apparatus comprising: a) color processing means for color processing a color image signal supplied; b) second means which has a predetermined gradation reproducing characteristic and processes a color image in accordance with the signal which was color processed by said color processing means; and c) means for controlling a processing state of the color processing means in accordance with the gradation reproducing characteristic of said second means.
Claim 3
Dependent Claim
19 words
An apparatus according to claim 1, wherein said second means is means which can change the gradation reproducing characteristic.
Claim 4
Dependent Claim
24 words
An apparatus according to claim 2, wherein said second means is means for forming a color image in accordance with the color processed signal.
Claim 5
Dependent Claim
73 words
A color image forming apparatus comprising: a) means for color processing a color image signal supplied; b) means for forming a color image in accordance with the color image signal which was color processed by said color processing means, said color image forming means being able to change a color image forming condition; and c) means for controlling a processing state of said color processing means in accordance with said image forming condition.
Claim 6
Dependent Claim
73 words
A color image forming apparatus comprising: a) means for color processing a color image signal supplied; b) means for forming a color image in accordance with the color image signal which was color processed by said color processing means, said color image forming means being able to change a color image forming condition; and c) means for controlling a processing state of said color processing means in accordance with said image forming condition.
Claim 7
Dependent Claim
53 words
An apparatus according to claim 3 or claim 4, wherein said color image forming means includes modulating means for pulse width modulating the color image signal which was color processed by said color processing means, and said color image forming condition can be changed by changing a reference frequency of said modulating means.
Claim 8
Dependent Claim
61 words
A color image processing apparatus comprising: a) gradation reproducing means having different gradation reproducing characteristics; b) color processing means for color processing a given image in accordance with the gradation reproducing characteristic of said gradation reproducing means; and c) control means for controlling processing characteristics of said color processing means and said gradation reproducing means in accordance with an image region.
Claim 9
Dependent Claim
61 words
A color image processing apparatus comprising: a) gradation reproducing means having different gradation reproducing characteristics; b) color processing means for color processing a given image in accordance with the gradation reproducing characteristic of said gradation reproducing means; and c) control means for controlling processing characteristics of said color processing means and said gradation reproducing means in accordance with an image region.
Claim 10
Dependent Claim
26 words
An apparatus according to claim 6, wherein said gradation reproducing means is means for reproducing the image which was color processed by said color processing means.
Claim 11
Dependent Claim
22 words
An apparatus according to claim 6, wherein said gradation reproducing means is means for reproducing a color image by an electrophotographic system.
Claim 12
Dependent Claim
46 words
An apparatus according to claim 6, wherein said gradation reproducing means includes means for pulse width modulating an image signal which was color processed by said color processing means and has different gradation reproducing characteristics by providing a plurality of reference frequencies for said modulating means.
Claim 13
Dependent Claim
20 words
An apparatus according to claim 6, further comprising: means for generating a region designation signal to designate said image region.
Claim 14
Dependent Claim
112 words
A color image processing apparatus for color correcting a color image signal given, comprising: a) color processing means for color processing a color image signal; b) modulating means for comparing a plurality of reference signals of different frequencies with the color image signal and for modulating each of color component signals of the color image signal which was color processed by said color processing means; c) selecting means for selecting an output of said modulating means in correspondence to a designated region of said color image signal; and d) control means for controlling a color processing characteristic of said color processing means in accordance with the output selected by said selecting means.
Claim 15
Dependent Claim
112 words
A color image processing apparatus for color correcting a color image signal given, comprising: a) color processing means for color processing a color image signal; b) modulating means for comparing a plurality of reference signals of different frequencies with the color image signal and for modulating each of color component signals of the color image signal which was color processed by said color processing means; c) selecting means for selecting an output of said modulating means in correspondence to a designated region of said color image signal; and d) control means for controlling a color processing characteristic of said color processing means in accordance with the output selected by said selecting means.
Claim 16
Dependent Claim
19 words
An apparatus according to claim 11, further comprising: e) generating means for generating a signal to designate said region.
Claim 17
Dependent Claim
24 words
An apparatus according to claim 11, further comprising: supplying means for supplying the signal modulated by said modulating means to color image forming means.
Claim 18
Dependent Claim
16 words
An apparatus according to claim 10 or claim 12, wherein said generating means includes a digitizer.
Claim 19
Independent Claim
29 words
An apparatus according to any one of claims 3, 4 and 13, wherein said color image forming means is means for reproducing a color image by an electrophotographic system.
Claim 20
Independent Claim
23 words
An apparatus according to any one of claims 1, 4, 6 and 11, wherein said color processing means is color masking processing means.
Claim 21
Independent Claim
22 words
An apparatus according to any one of claims 1, 4, 6 and 11, wherein said color processing means is undercolor processing means.
Claim 22
Dependent Claim
69 words
An apparatus according to claim 17 when dependent on any one of claims 1, 4 and 6, wherein said undercolor processing means includes means for detecting the minimum value of each of primary color signals of the color image signal and is means for removing a value which is obtained by multiplying a predetermined coefficient to said minimum value as an undercolor from each of the primary color signal.
Claim 23
Dependent Claim
36 words
An apparatus according to claim 18 when claim 17 is dependent on claim 1, wherein said second means is means for forming a color image in accordance with the signal from which the undercolor was removed.
Claim 24
Dependent Claim
35 words
An apparatus according to claim 18 when claim 17 is dependent on claim 6, wherein said gradation reproducing means is means for forming a color image in accordance with the signal whose undercolor was removed.
Claim 25
Dependent Claim
39 words
Color image processing apparatus in which the mode of processing the chromaticity of an image is selected from a plurality of available modes in accordance with the selection of the mode of processing a further aspect of the image.
Claim 26
Dependent Claim
39 words
Color image processing apparatus in which the mode of processing the chromaticity of an image is selected from a plurality of available modes in accordance with the selection of the mode of processing a further aspect of the image.
References Cited (Backward Citations)
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