Patent US326541A successfully refreshed from Google Patents.
Patent US4965664A successfully refreshed from Google Patents.
US4965664A
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US
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Color image signal processing method and apparatus for recording a color image from input color image signals by converting an individual color signal component
Assignee: Canon Inc
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Filing: 1987-08-12
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Granted: 1990-10-23
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Expires: 2007-08-12
Abstract
Abstract A color image signal processing apparatus for recording a color image from input color image signals includes an input unit for inputting color image signals composed of a plurality of color component signals into the apparatus, a unit for obtaining a luminance signal, a hue signal and a chroma signal based on the plurality of inputted color component signals, a gradation converter for converting the gradation characteristic of the luminance signal, and a color correction unit for performing color correction based on the luminance signal converted by the gradation converter, the hue signal and the chroma signal, and obtaining a recording original color signal. The hue and chroma signals are obtained based on spectrum tristimulus values which are obtained through conversion of said color component signals. The present invention thus enables more accurate color reproduction since it uses individual gradation conversion of the luminance signal.
Inventors
- 👤 Yoshiro Udagawa
- 👤 Hideo Takiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:48
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
59 words
A color image signal processing apparatus comprising: input means for inputting analog color image signals; means for obtaining an analog luminance signal, an analog hue signal, and an analog chroma signal based on said analog color image signals; and conversion means for converting said analog luminance signal, said analog hue signal and said analog chroma signal into digital signals.
Claim 2
Dependent Claim
59 words
A color image signal processing apparatus comprising: input means for inputting analog color image signals; means for obtaining an analog luminance signal, an analog hue signal, and an analog chroma signal based on said analog color image signals; and conversion means for converting said analog luminance signal, said analog hue signal and said analog chroma signal into digital signals.
Claim 3
Dependent Claim
18 words
An apparatus according to claim 1, wherein said analog color image signals are three primary color component signals.
Claim 4
Dependent Claim
32 words
An apparatus according to claim 1, wherein said analog hue signal and said analog chroma signal are obtained based on spectrum tristimulus values obtained through conversion of said analog color image signals.
Claim 5
Dependent Claim
60 words
A color signal processing method comprising the steps of: obtaining recording original color data other than black image data by correcting input color image signals to be coincident with a color reproduction characteristic; and extracting black image data from input luminance information and chroma information, wherein the chroma information is not corrected to be coincident with the color reproduction characteristic.
Claim 6
Dependent Claim
60 words
A color signal processing method comprising the steps of: obtaining recording original color data other than black image data by correcting input color image signals to be coincident with a color reproduction characteristic; and extracting black image data from input luminance information and chroma information, wherein the chroma information is not corrected to be coincident with the color reproduction characteristic.
Claim 7
Dependent Claim
20 words
A method according to claim 4, wherein the input color image signals include the luminance information and two color-difference signals.
Claim 8
Dependent Claim
21 words
A method according to claim 5, wherein the chroma information is obtained from the two color-difference signals during said extracting step.
Claim 9
Dependent Claim
37 words
A method according to claim 4, wherein the recording original color data is obtained by correcting the input color image signals to be coincident with a color reproduction characteristic of a recording material during said obtaining step.
Claim 10
Dependent Claim
26 words
A method according to claim 4, wherein the input chroma information is not corrected to be coincident with the color reproduction characteristic of a recording material.
Claim 11
Dependent Claim
13 words
A method according to claim 7, wherein the recording material includes an ink.
Claim 12
Dependent Claim
13 words
A method according to claim 8, wherein the recording material includes an ink.
Claim 13
Dependent Claim
66 words
A color image signal processing apparatus comprising: correction means for outputting recording original color data other than black image data by correcting input color image signals to be coincident with a color reproduction characteristic; and conversion means for obtaining black image data based on input luminance information and chroma information, wherein said input chroma information is not corrected to be coincident with the color reproduction characteristic.
Claim 14
Dependent Claim
66 words
A color image signal processing apparatus comprising: correction means for outputting recording original color data other than black image data by correcting input color image signals to be coincident with a color reproduction characteristic; and conversion means for obtaining black image data based on input luminance information and chroma information, wherein said input chroma information is not corrected to be coincident with the color reproduction characteristic.
Claim 15
Dependent Claim
24 words
A color image signal processing apparatus according to claim 11, wherein said input color image signals include said luminance information and two color-difference signals.
Claim 16
Dependent Claim
23 words
A color image signal processing apparatus according to claim 12, wherein said conversion means obtains said chroma information from said two color-difference signals.
Claim 17
Dependent Claim
32 words
A color image signal processing apparatus according to claim 11, wherein said correction means corrects said input color image signals to be coincident with a color reproduction characteristic of a recording material.
Claim 18
Dependent Claim
30 words
A color image signal processing apparatus according to claim 11, wherein said input chroma information is not corrected to be coincident with a color reproduction characteristic of a recording material.
Claim 19
Dependent Claim
16 words
A color image signal processing apparatus according to 14, wherein said recording material includes an ink.
Claim 20
Dependent Claim
16 words
A color image signal processing apparatus according to 14, wherein said recording material includes an ink.
Claim 21
Dependent Claim
16 words
A color image signal processing apparatus according to 15, wherein said recording material includes an ink.
Claim 22
Dependent Claim
16 words
A color image signal processing apparatus according to 15, wherein said recording material includes an ink.
Claim 23
Dependent Claim
113 words
A color image signal processing apparatus for an output device having a color reproduction characteristic comprising: input means for inputting color image signals composed of a plurality of color component signals; means for obtaining a luminance signal, a hue signal and a chroma signal based on said plurality of input color component signals; correction means for correcting said hue signal in accordance with said color reproduction characteristic; and means for obtaining a recording original color signal for application to said output device based on said hue signal corrected by said correction means, said luminance signal and said chroma signal, correction of said luminance signal according to the color reproduction characteristic not being performed.
Claim 24
Dependent Claim
113 words
A color image signal processing apparatus for an output device having a color reproduction characteristic comprising: input means for inputting color image signals composed of a plurality of color component signals; means for obtaining a luminance signal, a hue signal and a chroma signal based on said plurality of input color component signals; correction means for correcting said hue signal in accordance with said color reproduction characteristic; and means for obtaining a recording original color signal for application to said output device based on said hue signal corrected by said correction means, said luminance signal and said chroma signal, correction of said luminance signal according to the color reproduction characteristic not being performed.
Claim 25
Dependent Claim
22 words
A color image signal processing apparatus according to claim 18, further comprising means for converting a gradation characteristic of said luminance signal.
Claim 26
Dependent Claim
39 words
A color image signal processing apparatus according to claim 18, wherein said correction means is constructed of a memory using said hue signal as an input address and storing beforehand corrected values for respective values of said hue signal.
Claim 27
Dependent Claim
66 words
A color signal processing method comprising the steps of: inputting luminance information and two color-difference signals; correcting said input luminance information and two color-difference signals to be coincident with a color reproduction characteristic and obtaining recording original color data other than black image data; extracting chroma information from said two input color-difference signals; and obtaining black image data from said input luminance information and chroma information.
Claim 28
Dependent Claim
66 words
A color signal processing method comprising the steps of: inputting luminance information and two color-difference signals; correcting said input luminance information and two color-difference signals to be coincident with a color reproduction characteristic and obtaining recording original color data other than black image data; extracting chroma information from said two input color-difference signals; and obtaining black image data from said input luminance information and chroma information.
Claim 29
Dependent Claim
79 words
A color image signal processing apparatus comprising: input means for inputting luminance information and two color-difference signals; correction means for correcting said input luminance information and two color-difference signals to be coincident with a color reproduction characteristic and outputting recording original color data other than black image data; extraction means for extracting chroma information from said two input color-difference signals; and conversion means for obtaining black image data based on said input luminance information and said extracted chroma information.
Claim 30
Dependent Claim
79 words
A color image signal processing apparatus comprising: input means for inputting luminance information and two color-difference signals; correction means for correcting said input luminance information and two color-difference signals to be coincident with a color reproduction characteristic and outputting recording original color data other than black image data; extraction means for extracting chroma information from said two input color-difference signals; and conversion means for obtaining black image data based on said input luminance information and said extracted chroma information.
Claim 31
Dependent Claim
40 words
A color image signal processing apparatus according to claim 22, wherein said conversion means is constructed of a memory using said luminance information and said chroma information as its input address and outputting the value of said black image data.
Claim 32
Dependent Claim
27 words
A color image signal processing apparatus according to claim 18, wherein said correction means corrects said hue signal according to color reproduction characteristic of a recording material.
Claim 33
Dependent Claim
17 words
A color image signal processing apparatus according to claim 24, wherein said recording material includes an ink.
Claim 34
Dependent Claim
46 words
A method according to claim 21, wherein, in said correcting step, said input luminance information and two color-difference signals are corrected to be coincident with the color reproduction characteristic of a recording material, to obtain the recording original color data other than the black image data.
Claim 35
Dependent Claim
43 words
A method according to claim 21, wherein, in said extracting step, said chroma information is extracted from said two input color-difference signals prior to the two input color-difference signals being corrected to be coincident with the color reproduction characteristic of a recording material.
Claim 36
Dependent Claim
13 words
A method according to claim 26, wherein the recording material includes an ink.
Claim 37
Dependent Claim
13 words
A method according to claim 27, wherein the recording material includes an ink.
Claim 38
Dependent Claim
47 words
A color image signal processing apparatus according to claim 22, wherein said correction means corrects said input luminance information and two color-difference signals to be coincident with the color reproduction characteristic of a recording material, to output recording original color data other than said black image data.
Claim 39
Dependent Claim
45 words
A color image signal processing apparatus according to claim 22, wherein said extraction means extracts said chroma information from said two input color-difference signals prior to the two input color-difference signals being corrected to be coincident with a color reproduction characteristic of a recording material.
Claim 40
Dependent Claim
17 words
A color image signal processing apparatus according to claim 30, wherein said recording material includes an ink.
Claim 41
Dependent Claim
17 words
A color image signal processing apparatus according to claim 31, wherein said recording material includes an ink.
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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) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |