US5390034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color image processing method and apparatus with chrominance emphasizing process
Assignee: Hitachi Ltd
•
Filing: 1993-01-21
•
Granted: 1995-02-14
•
Expires: 2013-01-21
Abstract
Abstract Color image processing method and apparatus for suppressing side effects of a chrominance emphasizing process are provided. A chrominance C of an original color image is detected by a chrominance detector. A luminousness V of the original color image is detected by a luminousness detector. A parameter selector selects chrominance conversion parameters on the basis of the chrominance C and luminousness V to generate a selected parameter. A chrominance converter executes the chrominance conversion by chrominance conversion parameters a to i. It is possible to suppress a side effect such that the color deviation becomes conspicuous in a portion of small chrominance and luminousness due to the execution of the chrominance emphasizing process. Thus, image data of a high quality can be obtained.
Inventors
- 👤 Tatsuya Murakami
- 👤 Eiichi Hadano
- 👤 Kazuyuki Kodama
- 👤 Kazunori Kinoshita
- 👤 Masaaki Fujinawa
- 👤 Hiromichi Fujisawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:10
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40062; H04N1/40075; H04N1/41; H04N1/4105
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
110 words
A color image processing method, comprising the steps of: inputting a digital color image; detecting at least one of a chrominance and a luminousness for each pixel of said input digital color image; outputting each pixel of said input digital color image having either of a chrominance C≦a chrominance threshold value β and a luminousness V≦luminousness threshold value γ, based on at least one of said detected chrominance and luminousness; and emphasizing the chrominance and outputting each pixel of said input color image having said chrominance C>said chrominance threshold value β and said luminousness V>said luminousness threshold value γ, based on at least one of said detected chrominance and luminousness.
Claim 2
Dependent Claim
110 words
A color image processing method, comprising the steps of: inputting a digital color image; detecting at least one of a chrominance and a luminousness for each pixel of said input digital color image; outputting each pixel of said input digital color image having either of a chrominance C≦a chrominance threshold value β and a luminousness V≦luminousness threshold value γ, based on at least one of said detected chrominance and luminousness; and emphasizing the chrominance and outputting each pixel of said input color image having said chrominance C>said chrominance threshold value β and said luminousness V>said luminousness threshold value γ, based on at least one of said detected chrominance and luminousness.
Claim 3
Dependent Claim
32 words
A method according to claim 1, wherein each pixel of said input digital color image is output whose chrominance C≦said chrominance threshold value β and whose luminousness V>said luminousness threshold value γ.
Claim 4
Dependent Claim
122 words
A color image processing method, comprising the steps of: inputting a digital color image; detecting at least one of a chrominance and a luminousness and a color attribute for each pixel of the input digital color image; outputting each pixel of said input digital color image having either of a chrominance C≦a chrominance threshold value β and a luminousness V≦luminousness threshold value γ, based on at least one of said detected chrominance and luminousness, wherein said color attribute satisfies a predetermined range; and emphasizing the chrominance and outputting each pixel of said input color image having a chrominance C>said chrominance threshold value β and said luminousness V>said luminousness threshold value γ, based on at least one of said detected chrominance and luminousness.
Claim 5
Dependent Claim
122 words
A color image processing method, comprising the steps of: inputting a digital color image; detecting at least one of a chrominance and a luminousness and a color attribute for each pixel of the input digital color image; outputting each pixel of said input digital color image having either of a chrominance C≦a chrominance threshold value β and a luminousness V≦luminousness threshold value γ, based on at least one of said detected chrominance and luminousness, wherein said color attribute satisfies a predetermined range; and emphasizing the chrominance and outputting each pixel of said input color image having a chrominance C>said chrominance threshold value β and said luminousness V>said luminousness threshold value γ, based on at least one of said detected chrominance and luminousness.
Claim 6
Dependent Claim
109 words
A color image processing method, comprising the steps of: inputting an analog color image; detecting at least one of a chrominance and luminousness for each coordinate of said input analog color image; outputting each coordinate of said input digital color image having either of a chrominance C≦a chrominance threshold value β and a luminousness V≦luminousness threshold value γ, based on at least one of said detected chrominance and luminousness; and emphasizing the chrominance and outputting each coordinate of said input color image having a chrominance C>said chrominance threshold value β and a luminousness V>said luminousness threshold value γ, based on at least one of said detected chrominance and luminousness.
Claim 7
Dependent Claim
109 words
A color image processing method, comprising the steps of: inputting an analog color image; detecting at least one of a chrominance and luminousness for each coordinate of said input analog color image; outputting each coordinate of said input digital color image having either of a chrominance C≦a chrominance threshold value β and a luminousness V≦luminousness threshold value γ, based on at least one of said detected chrominance and luminousness; and emphasizing the chrominance and outputting each coordinate of said input color image having a chrominance C>said chrominance threshold value β and a luminousness V>said luminousness threshold value γ, based on at least one of said detected chrominance and luminousness.
Claim 8
Dependent Claim
127 words
A color image processing method, comprising the steps of: inputting a digital color image; detecting at least one of a chrominance and a luminousness for each pixel of said input digital color image; suppressing the chrominance and outputting each pixel of said input digital color image having either of a chrominance C≦a chrominance threshold value β and a luminousness V≦luminousness threshold value γ, based on at least one of said detected chrominance and luminousness; outputting each pixel of said input digital color image whose chrominance C≦β and whose luminousness V>said luminousness threshold value γ; outputting each pixel of said input digital color image in which β<chrominance C≦another chrominance threshold value α; and emphasizing the chrominance and outputting each pixel of said input color image in which C>α.
Claim 9
Dependent Claim
127 words
A color image processing method, comprising the steps of: inputting a digital color image; detecting at least one of a chrominance and a luminousness for each pixel of said input digital color image; suppressing the chrominance and outputting each pixel of said input digital color image having either of a chrominance C≦a chrominance threshold value β and a luminousness V≦luminousness threshold value γ, based on at least one of said detected chrominance and luminousness; outputting each pixel of said input digital color image whose chrominance C≦β and whose luminousness V>said luminousness threshold value γ; outputting each pixel of said input digital color image in which β<chrominance C≦another chrominance threshold value α; and emphasizing the chrominance and outputting each pixel of said input color image in which C>α.
Claim 10
Dependent Claim
120 words
A color image processing apparatus, comprising: chrominance detecting means for detecting a chrominance for every pixel of a digital color image; luminousness detecting means for detecting a luminousness for every pixel of a digital color image; output means for outputting each pixel of said input digital color image having either of a chrominance C≦a chrominance threshold value β and a luminousness V≦luminousness threshold value γ, based on at least one of said detected chrominance and luminousness; and emphasis means for emphasizing the chrominance and outputting each pixel of said input digital color image having said chrominance C>said chrominance threshold value β and said luminousness V>said luminousness threshold value γ, based on at least one of said detected chrominance and luminousness.
Claim 11
Dependent Claim
120 words
A color image processing apparatus, comprising: chrominance detecting means for detecting a chrominance for every pixel of a digital color image; luminousness detecting means for detecting a luminousness for every pixel of a digital color image; output means for outputting each pixel of said input digital color image having either of a chrominance C≦a chrominance threshold value β and a luminousness V≦luminousness threshold value γ, based on at least one of said detected chrominance and luminousness; and emphasis means for emphasizing the chrominance and outputting each pixel of said input digital color image having said chrominance C>said chrominance threshold value β and said luminousness V>said luminousness threshold value γ, based on at least one of said detected chrominance and luminousness.
Claim 12
Dependent Claim
31 words
An apparatus according to claim 6, wherein said output means further outputs the pixel whose chrominance C≦said predetermined chrominance threshold value β or whose luminousness V>said predetermined luminousness threshold value α.
Claim 13
Dependent Claim
136 words
A color image processing apparatus, comprising: chrominance detecting means for detecting a chrominance for every pixel of a digital color image; luminousness detecting means for detecting a luminousness for every pixel of a digital color image; color attribute detecting means for detecting color attribute for every pixel of the digital color image; output means for outputting each pixel of said input digital color image having either of a chrominance C≦a chrominance threshold value β and a luminousness V≦luminousness threshold value γ, based on at least one of said detected chrominance and luminousness; and emphasis means for emphasizing the chrominance and outputting each pixel of said input digital color image having said chrominance C>said chrominance threshold value β and said luminousness V>said luminousness threshold value γ, based on at least one of said detected chrominance and luminousness.
Claim 14
Dependent Claim
136 words
A color image processing apparatus, comprising: chrominance detecting means for detecting a chrominance for every pixel of a digital color image; luminousness detecting means for detecting a luminousness for every pixel of a digital color image; color attribute detecting means for detecting color attribute for every pixel of the digital color image; output means for outputting each pixel of said input digital color image having either of a chrominance C≦a chrominance threshold value β and a luminousness V≦luminousness threshold value γ, based on at least one of said detected chrominance and luminousness; and emphasis means for emphasizing the chrominance and outputting each pixel of said input digital color image having said chrominance C>said chrominance threshold value β and said luminousness V>said luminousness threshold value γ, based on at least one of said detected chrominance and luminousness.
Claim 15
Dependent Claim
118 words
A color image processing apparatus, comprising: chrominance detecting means for detecting a chrominance for every coordinate of an analog color image; luminousness detecting means for detecting a luminousness for every coordinate of said analog color image; output means for outputting each coordinate of said input analog color image having either of a chrominance C≦a chrominance threshold value β and a luminousness V≦luminousness threshold value γ, based on at least one of said detected chrominance and luminousness; and emphasis means for emphasizing the chrominance and outputting each coordinate of said input analog color image having said chrominance C>said chrominance threshold value and said luminousness V>said luminousness threshold value based on at least one of said detected chrominance and luminousness.
Claim 16
Dependent Claim
118 words
A color image processing apparatus, comprising: chrominance detecting means for detecting a chrominance for every coordinate of an analog color image; luminousness detecting means for detecting a luminousness for every coordinate of said analog color image; output means for outputting each coordinate of said input analog color image having either of a chrominance C≦a chrominance threshold value β and a luminousness V≦luminousness threshold value γ, based on at least one of said detected chrominance and luminousness; and emphasis means for emphasizing the chrominance and outputting each coordinate of said input analog color image having said chrominance C>said chrominance threshold value and said luminousness V>said luminousness threshold value based on at least one of said detected chrominance and luminousness.
Claim 17
Dependent Claim
132 words
A color image processing apparatus, comprising: chrominance detecting means for detecting a chrominance for every pixel of a digital color image; luminousness detecting means for detecting luminousness for every pixel of said digital color image; suppressing means for suppressing the chrominance and outputting each pixel of said input digital color image having either of a chrominance C≦a chrominance threshold value β and a luminousness V≦luminousness threshold value γ, based on at least one of said detected chrominance and luminousness; outputting means for outputting each pixel of said input color image having a chrominance c≦β and luminousness V>γ and for the pixel having a threshold value γ< chrominance C≦another chrominance threshold value α; and emphasis means for emphasizing the chrominance and outputting each pixel having said chrominance C>said another chrominance threshold value α.
Claim 18
Dependent Claim
132 words
A color image processing apparatus, comprising: chrominance detecting means for detecting a chrominance for every pixel of a digital color image; luminousness detecting means for detecting luminousness for every pixel of said digital color image; suppressing means for suppressing the chrominance and outputting each pixel of said input digital color image having either of a chrominance C≦a chrominance threshold value β and a luminousness V≦luminousness threshold value γ, based on at least one of said detected chrominance and luminousness; outputting means for outputting each pixel of said input color image having a chrominance c≦β and luminousness V>γ and for the pixel having a threshold value γ< chrominance C≦another chrominance threshold value α; and emphasis means for emphasizing the chrominance and outputting each pixel having said chrominance C>said another chrominance threshold value α.
References Cited (Backward Citations)
US4733295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-02-13 | 1998-08-15 | 1999-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-13 | 2002-08-15 | 2003-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-13 | 2006-08-15 | 2007-02-14 | $7700.00 | Window Closed / Lapsed |