US5459530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for matching colors in image signals
Assignee: AT&T Inc
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Filing: 1994-12-14
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Granted: 1995-10-17
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Expires: 2014-12-14
Abstract
Abstract An inexpensive, yet robust color matcher is achieved by an apparatus which includes a compare device coupled to receive, as a first input, an input signal representing a combination of a luminance component Y and a chrominance component, and further coupled to receive as a second input, a threshold T, for comparing the input signal to the threshold T and outputting a color match signal if the input signal falls within a range defined by T and -T; and a threshold supply device coupled to the second input for supplying the threshold T, wherein the threshold T is a function of Y and at least two adjustable parameters.
Inventors
- 👤 Russell L. Andersson
- 👤 David C. Gibbon
- 👤 Jakub Segen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:25
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N17/00; H04N17/02; H04N9/77
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
An apparatus, comprising: a compare device coupled to receive, as a first input, an input signal representing a combination of a luminance component Y and a chrominance component, and further coupled to receive as a second input, a threshold T, for comparing said input signal to said threshold T and outputting a color match signal if said input signal falls within a range defined by T and -T; and a threshold supply device coupled to said second input for supplying said threshold T, wherein said threshold T is a function of said luminance component Y and at least two adjustable parameters.
Claim 2
Independent Claim
101 words
An apparatus, comprising: a compare device coupled to receive, as a first input, an input signal representing a combination of a luminance component Y and a chrominance component, and further coupled to receive as a second input, a threshold T, for comparing said input signal to said threshold T and outputting a color match signal if said input signal falls within a range defined by T and -T; and a threshold supply device coupled to said second input for supplying said threshold T, wherein said threshold T is a function of said luminance component Y and at least two adjustable parameters.
Claim 3
Dependent Claim
41 words
The apparatus of claim 1 wherein said threshold T is defined by T=αY+β, and β≠0 and α is a first one of said at least two adjustable parameters and β is a second one of said at least two adjustable parameters.
Claim 4
Dependent Claim
270 words
A color matcher, comprising: a first multiplier coupled to receive a luminance signal as an input for scaling said luminance signal by a first factor k 1 ; a second multiplier coupled to receive said luminance signal as an input for scaling said luminance signal by a second factor k 2 ; a first subtractor coupled to receive, as a first input said scaled luminance signal from said first multiplier; and coupled to receive, as a second input, a first chrominance signal, for determining a first difference between said first scaled luminance signal and said first chrominance signal; a second subtractor coupled to receive, as a first input said scaled luminance signal from said second multiplier; and coupled to receive, as a second input, a second chrominance signal, for determining a second difference between said second scaled luminance signal and said second chrominance signal; a first compare device coupled to receive, as a first input, said first difference, and coupled to receive as a second input, a first threshold, for comparing said first difference to said first threshold and outputting a first color match signal; a second compare device coupled to receive, as a first input, said second difference, and coupled to receive as a second input, a second threshold, for comparing said second difference to said second threshold and outputting a second color match signal; and an AND gate coupled to receive, as a first input, said first color match signal, and coupled to receive, as a second input, said second color match signal, for performing a logical AND function between said first and said second color match signals.
Claim 5
Dependent Claim
270 words
A color matcher, comprising: a first multiplier coupled to receive a luminance signal as an input for scaling said luminance signal by a first factor k 1 ; a second multiplier coupled to receive said luminance signal as an input for scaling said luminance signal by a second factor k 2 ; a first subtractor coupled to receive, as a first input said scaled luminance signal from said first multiplier; and coupled to receive, as a second input, a first chrominance signal, for determining a first difference between said first scaled luminance signal and said first chrominance signal; a second subtractor coupled to receive, as a first input said scaled luminance signal from said second multiplier; and coupled to receive, as a second input, a second chrominance signal, for determining a second difference between said second scaled luminance signal and said second chrominance signal; a first compare device coupled to receive, as a first input, said first difference, and coupled to receive as a second input, a first threshold, for comparing said first difference to said first threshold and outputting a first color match signal; a second compare device coupled to receive, as a first input, said second difference, and coupled to receive as a second input, a second threshold, for comparing said second difference to said second threshold and outputting a second color match signal; and an AND gate coupled to receive, as a first input, said first color match signal, and coupled to receive, as a second input, said second color match signal, for performing a logical AND function between said first and said second color match signals.
References Cited (Backward Citations)
US5267026A
Cited
US5337083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-10-16 | 1999-04-17 | 1999-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-16 | 2003-04-17 | 2003-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-16 | 2007-04-17 | 2007-10-17 | $7700.00 | Window Closed / Lapsed |