US4985759A
Expired / Lapsed
US
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Method and apparatus for extracting black color component
Assignee: Ricoh Co Ltd
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Filing: 1989-04-04
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Granted: 1991-01-15
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Expires: 2009-04-04
Abstract
Abstract A black color component extracting apparatus used for a color image reproducing machine. The apparatus includes a hue area judgement unit for judging to which hue area among at least three predetermined hue areas the hue represented by input color image signals belongs. With respect to the judged hue area according to this judgement, the black color extraction parameters are set, and in accordance with the set black color extraction parameters, black color component is extracted. The black color extraction parameters are determined from two chromatic colors P and Q positioned in respective boundary planes which defines the judge hue area, and from an achromatic color N.
Inventors
- 👤 Takanori Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:35
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6016; H04N1/6022
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
125 words
A method of extracting a black color component from input image signals of basic colors, representative of color separated input images, said method comprising the steps of: judging to which hue area among at least three predetermined hue areas the hue represented by said input image signals belongs; setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said judged hue area and from an achromatic color N; and extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component.
Claim 2
Independent Claim
125 words
A method of extracting a black color component from input image signals of basic colors, representative of color separated input images, said method comprising the steps of: judging to which hue area among at least three predetermined hue areas the hue represented by said input image signals belongs; setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said judged hue area and from an achromatic color N; and extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component.
Claim 3
Dependent Claim
23 words
A method as claimed in claim 1, wherein said judging step includes the step of comparing the input image signals with each other.
Claim 4
Dependent Claim
41 words
A method as claimed in claim 1, wherein said setting step includes the step of storing black color extraction parameters, and the step of selecting a part of the stored black color extraction parameters in accordance with the hue area judged.
Claim 5
Independent Claim
154 words
A method of extracting a black color component from input image signals of basic colors, representative of color-separated input images, said method comprising the steps of: designating a desired saturation; judging to which hue area among at least three predetermined hue areas the hue represented by said input images signals belongs; setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said judged hue area and from an achromatic color N, the ratio between a color component synthesized from the chromatic colors P and Q and the black color component being controlled depending upon said designated saturation; and extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component.
Claim 6
Independent Claim
154 words
A method of extracting a black color component from input image signals of basic colors, representative of color-separated input images, said method comprising the steps of: designating a desired saturation; judging to which hue area among at least three predetermined hue areas the hue represented by said input images signals belongs; setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said judged hue area and from an achromatic color N, the ratio between a color component synthesized from the chromatic colors P and Q and the black color component being controlled depending upon said designated saturation; and extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component.
Claim 7
Dependent Claim
23 words
A method as claimed in claim 4, wherein said judging step includes the step of comparing the input image signals with each other.
Claim 8
Independent Claim
127 words
An apparatus for extracting a black color component from input image signals of basic colors, representative of color-separated input images, said apparatus comprising: means for judging to which hue area among at least three predetermined hue areas the hue represented by said input image signals belongs; means for setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said judged hue area and from an achromatic color N; and means for extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component.
Claim 9
Independent Claim
127 words
An apparatus for extracting a black color component from input image signals of basic colors, representative of color-separated input images, said apparatus comprising: means for judging to which hue area among at least three predetermined hue areas the hue represented by said input image signals belongs; means for setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said judged hue area and from an achromatic color N; and means for extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component.
Claim 10
Dependent Claim
22 words
An apparatus as claimed in claim 6, wherein said judging means includes means for comparing the input image signals with each other.
Claim 11
Dependent Claim
24 words
An apparatus as claimed in claim 7, wherein said comparing means includes three comparators for comparing the three input image signals with each other.
Claim 12
Independent Claim
163 words
An apparatus for extracting a black color component from input image signals of basic colors, representative of color-separated input images, said apparatus comprising: means for designating a desired saturation; means for judging to which hue area among at least three predetermined hue areas the hue represented by said input image signals belongs; means for setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said judged hue area and from an achromatic color N, the ratio between a color component synthesized from the chromatic colors P and Q and the black color component being controlled depending upon the designated saturation from said designating means; and means for extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component.
Claim 13
Independent Claim
163 words
An apparatus for extracting a black color component from input image signals of basic colors, representative of color-separated input images, said apparatus comprising: means for designating a desired saturation; means for judging to which hue area among at least three predetermined hue areas the hue represented by said input image signals belongs; means for setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said judged hue area and from an achromatic color N, the ratio between a color component synthesized from the chromatic colors P and Q and the black color component being controlled depending upon the designated saturation from said designating means; and means for extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component.
Claim 14
Dependent Claim
22 words
An apparatus as claimed in claim 9, wherein said judging means includes means for comparing the input image signals with each other.
Claim 15
Dependent Claim
24 words
An apparatus as claimed in claim 10, wherein said comparing means includes three comparators for comparing the three input image signals with each other.
Claim 16
Dependent Claim
43 words
An apparatus as claimed in claim 9, wherein said setting means includes means for storing black color extraction parameters, and means for selecting a part of the black color extraction parameters storing in said storing means in accordance with the hue area judged.
Claim 17
Dependent Claim
178 words
A color image reproducing machine comprising: means for optoelectrically converting light signals separated in basic colors, representative of color-separated images of an original document, to electrical input image signals, respectively; means for judging to which hue area among at least three predetermined hue areas the hue represented by said input image signals belongs; means for setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said judged hue area and from an achromatic color N; means for extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component; means for correcting the input image signals in accordance with said black color component signal; means for converting said corrected input image signals to output image signals; and means for printing a color image of the original in accordance with said converted output image signals.
Claim 18
Dependent Claim
178 words
A color image reproducing machine comprising: means for optoelectrically converting light signals separated in basic colors, representative of color-separated images of an original document, to electrical input image signals, respectively; means for judging to which hue area among at least three predetermined hue areas the hue represented by said input image signals belongs; means for setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said judged hue area and from an achromatic color N; means for extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component; means for correcting the input image signals in accordance with said black color component signal; means for converting said corrected input image signals to output image signals; and means for printing a color image of the original in accordance with said converted output image signals.
Claim 19
Dependent Claim
22 words
A machine as claimed in claim 13, wherein said judging means includes means for comparing the input image signals with each other.
Claim 20
Dependent Claim
24 words
A machine as claimed in claim 14, wherein said comparing means includes three comparators for comparing the three input image signals with each other.
Claim 21
Independent Claim
149 words
A method of extracting a black color component from three input image signals of basic colors, representative of color-separated input images, said method comprising the steps of: judging to which hue area among at least three predetermined hue areas the hue represented by said input image signals belongs, including, adding two of the three input image signals, and comparing the remaining one of the three input image signals with the added result; setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said judged hue area and from an achromatic color N; and extracting the black color component contained in said input images in accordance with said set black color extraction parameters to provide a black color component signal representative of the extracted black color component.
Claim 22
Independent Claim
149 words
A method of extracting a black color component from three input image signals of basic colors, representative of color-separated input images, said method comprising the steps of: judging to which hue area among at least three predetermined hue areas the hue represented by said input image signals belongs, including, adding two of the three input image signals, and comparing the remaining one of the three input image signals with the added result; setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said judged hue area and from an achromatic color N; and extracting the black color component contained in said input images in accordance with said set black color extraction parameters to provide a black color component signal representative of the extracted black color component.
Claim 23
Independent Claim
175 words
A method of extracting a black color component from three input image signals of basic colors, representative of color-separated input images, said method comprising the steps of: designating a desired saturation; judging to which hue area amount at least three predetermined hue areas the hue represented by said input image signals belongs including, adding two of the three input image signals, and comparing the remaining one of the three input image signals with the added result; setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and positioned in respective boundary planes which define said judged hue area and from an achromatic color N, the ratio between the color component synthesized from the chromatic colors and the black color component being controlled depending upon said designated saturation; and extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component.
Claim 24
Independent Claim
175 words
A method of extracting a black color component from three input image signals of basic colors, representative of color-separated input images, said method comprising the steps of: designating a desired saturation; judging to which hue area amount at least three predetermined hue areas the hue represented by said input image signals belongs including, adding two of the three input image signals, and comparing the remaining one of the three input image signals with the added result; setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and positioned in respective boundary planes which define said judged hue area and from an achromatic color N, the ratio between the color component synthesized from the chromatic colors and the black color component being controlled depending upon said designated saturation; and extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component.
Claim 25
Dependent Claim
41 words
A method as claimed in claim 17, wherein said setting step includes the step of storing black color extraction parameters and the step of selecting a part of the stored black color extraction parameters in accordance with the hue area judged.
Claim 26
Independent Claim
156 words
An apparatus for extracting a black color component from three input image signals of basic colors, representative of color-separated input images, said apparatus comprising: means for judging to which hue area among at least three predetermined hue areas the hue represented by said input image signals belongs, including means for adding two of the three input image signals, and means for comparing the remaining one of the three input image signals with the added result; means for setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said judged hue area and from an achromatic color N; and means for extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component.
Claim 27
Independent Claim
156 words
An apparatus for extracting a black color component from three input image signals of basic colors, representative of color-separated input images, said apparatus comprising: means for judging to which hue area among at least three predetermined hue areas the hue represented by said input image signals belongs, including means for adding two of the three input image signals, and means for comparing the remaining one of the three input image signals with the added result; means for setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said judged hue area and from an achromatic color N; and means for extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component.
Claim 28
Dependent Claim
54 words
An apparatus as claimed in claim 19, wherein said adding means includes an adder for adding two of the three input image signals to produce an output signal, and wherein said comparing means includes a comparator for comparing the remaining one of the three input image signals with the output signal from the adder.
Claim 29
Dependent Claim
43 words
An apparatus as claimed in claim 19, wherein said setting means includes means for holding black color extraction parameters, and means for selecting a part of the black color extraction parameters held in said storing means in accordance with the hue area judged.
Claim 30
Dependent Claim
61 words
An apparatus as claimed in claim 19, wherein said extracting means includes a plurality of multipliers, with each multiplier receiving one of said input image signals and each multiplier also receiving a black color extraction parameter from said setting means, for producing a product signal, and at least one adder for adding together said product signals to product an output signal.
Claim 31
Independent Claim
189 words
An apparatus for extracting a black color component from three input image signals of basic colors, representative of color-separated input images, said apparatus comprising: means for designating a desired saturation; means for judging to which hue area among at least three predetermined hue areas the hue represented by said input image signals belongs, including means for adding two of the three input image signals, and means for comparing the remaining one of the three input image signals with the added result; means for setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said hudged hue area and from an achromatic color N, the ratio between the color component synthesized from the chromatic colors and the black color component being controlled depending upon the designated saturation from said designating means; and means for extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component.
Claim 32
Independent Claim
189 words
An apparatus for extracting a black color component from three input image signals of basic colors, representative of color-separated input images, said apparatus comprising: means for designating a desired saturation; means for judging to which hue area among at least three predetermined hue areas the hue represented by said input image signals belongs, including means for adding two of the three input image signals, and means for comparing the remaining one of the three input image signals with the added result; means for setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said hudged hue area and from an achromatic color N, the ratio between the color component synthesized from the chromatic colors and the black color component being controlled depending upon the designated saturation from said designating means; and means for extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component.
Claim 33
Dependent Claim
53 words
An apparatus as claimed in claim 23, wherein said adding means includes an adder for adding two of the three input signals to produce an output signal, and wherein said comparing means includes a comparator for comparing the remaining one of the three input image signals with the output signal from the adder.
Claim 34
Dependent Claim
207 words
A color image reproducing machine comprising: means for optoelectrically converting light signals separated in basic colors, representative of color-separated images of an original document, to three electrical input image signals, respectively; means for judging to which hue area among at least three predetermined hue areas the hue represented by said input image signals belongs, including; means for adding two of the three input image signals, and means for comparing the remaining one of the three input image signals with the added result; means for setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said judged hue area and from an achromatic color N; means for extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component; means for correcting the input image signals in accordance with said black color component signal; means for converting said corrected input image signals to output image signals; and means for printing a color image of the original in accordance with said converted output image signals.
Claim 35
Dependent Claim
207 words
A color image reproducing machine comprising: means for optoelectrically converting light signals separated in basic colors, representative of color-separated images of an original document, to three electrical input image signals, respectively; means for judging to which hue area among at least three predetermined hue areas the hue represented by said input image signals belongs, including; means for adding two of the three input image signals, and means for comparing the remaining one of the three input image signals with the added result; means for setting black color extraction parameters with respect to the judged hue area, the black color extraction parameters being determined from two chromatic colors P and Q positioned in respective boundary planes which define said judged hue area and from an achromatic color N; means for extracting the black color component contained in said input images in accordance with said set black color extraction parameters to produce a black color component signal representative of the extracted black color component; means for correcting the input image signals in accordance with said black color component signal; means for converting said corrected input image signals to output image signals; and means for printing a color image of the original in accordance with said converted output image signals.
Claim 36
Dependent Claim
54 words
A machine as claimed in claim 25, wherein said adding means includes an adder for adding two of the three input image signals to produce an output signal, and wherein said comparing means includes a comparator for comparing the remaining one of the three input image signals with the output signal from the adder.
Claim 37
Dependent Claim
43 words
A machine as claimed in claim 25, wherein said setting means includes means for storing black color extraction parameters, and means for selecting a part of the black color extraction parameters stored in said storing means in accordance with the hue area judged.
Claim 38
Dependent Claim
61 words
A machine as claimed in claim 25, wherein said extracting means includes a plurality of multipliers, with each multiplier receiving one of said input image signals and each multiplier also receiving a black color extraction parameter from said setting means, for producing a product signal, and at least one adder for adding together said product signals to produce an output signal.
Claim 39
Dependent Claim
24 words
A machine as claimed in claim 25, wherein said comparing means includes three comparators for comparing the three input image signals with each other.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-14 | 1994-07-16 | 1995-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-14 | 1998-07-16 | 1999-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-14 | 2002-07-16 | 2003-01-15 | $7700.00 | Window Closed / Lapsed |