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US3758707A
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Method for obtaining electronic color correction signals
Assignee: Individual
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Filing: 1971-12-27
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Granted: 1973-09-11
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Expires: 1991-12-27
Abstract
Abstract A method for obtaining electronic color correction signals in which the differences with respect to compensative masking (elimination of the gray tones) are formed between the amplitudes of the logarithmic or trichromatic color measurement signals nonlinearly transformed. These difference signals are split by selection according to their sign into primary partial signals from each two of which a further signal may be formed and divided into secondary partial signals according to actual sign. An emphasis of primary and/or secondary partial signals is provided wherein the signals are emphasized more strongly in definite areas of the color space than in other color areas of the region of the color space encompassed by the partial signals. Relative emphasis is effected only over a relatively limited area within the color scale extending from a neutral (non-chomatic) color to a saturated chromatic color selectively by transforming the partial signals in accordance with a non-linear function. The same partial signal may be transformed in accordance with two different functions, for example, a logarithmic and a negative linear function, and the difference signal is formed from the two resulting transformation signals. The signals are then employed to control color amplifying channels in the color correction process.
Inventors
- 👤 H Keller
- 👤 H Knop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:22
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6016; H04N1/6022; H04N1/62
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
118 words
In a method for obtaining electronic color correction signals including generating color measurement signals, transforming the color measurement signals in a non-linear fashion and dividing the transformed signals according to sign, combining the divided signals and dividing again according to sign into primary partial signals, and combining the primary partial signals and dividing according to sign into secondary partial signals, the improvement in the method comprising further transforming the partial secondary signals by selectively emphasizing those signals in definite areas of color space more strongly than those signals in other areas of the color space encompassed by the secondary partial signals in accordance with a transfer function which is emphasized between a nonchromatic color and a chromatic color.
Claim 2
Dependent Claim
118 words
In a method for obtaining electronic color correction signals including generating color measurement signals, transforming the color measurement signals in a non-linear fashion and dividing the transformed signals according to sign, combining the divided signals and dividing again according to sign into primary partial signals, and combining the primary partial signals and dividing according to sign into secondary partial signals, the improvement in the method comprising further transforming the partial secondary signals by selectively emphasizing those signals in definite areas of color space more strongly than those signals in other areas of the color space encompassed by the secondary partial signals in accordance with a transfer function which is emphasized between a nonchromatic color and a chromatic color.
Claim 3
Dependent Claim
42 words
In the method according to claim 1, wherein said further transformation of the partial secondary signals is further defined as comprising the step of emphasizing said signals with the emphasis lying at a saturated color in accordance with a selected non-linear function.
Claim 4
Dependent Claim
36 words
In a method according to claim 2, wherein the further transformation of the partial secondary signals comprises non-linearly emphasizing signals lying in the intermediate values of the color scales extending from white to a saturated color.
Claim 5
Dependent Claim
36 words
In a method according to claim 2, wherein the further transformation of the partial secondary signals comprises non-linearly emphasizing Signals lying in the intermediate values of the color scales extending from black to a saturated color.
Claim 6
Dependent Claim
31 words
In a method according to claim 1, wherein the further transformation of the partial secondary signals comprises the step of emphasizing the partial signals in accordance with a predetermined non-linear function.
Claim 7
Dependent Claim
21 words
In a method according to claim 5, wherein the non-linear emphasis is provided with the emphasis lying in a saturated color.
Claim 8
Dependent Claim
48 words
In a method according to claim 1, wherein the further transformation of the partial secondary signals includes transforming a partial signal in accordance with a logarithmic function, transforming the same partial signal in accordance with a negatively linear function, and providing the difference between the two transformed signals.
Claim 9
Dependent Claim
31 words
In a method according to claim 7, wherein the further transformation of the partial secondary signals includes providing that the difference between the two transformed signals is zero for predetermined colors.
Claim 10
Dependent Claim
59 words
In a method according to claim 8, wherein the further transformation of the partial secondary signals further includes feeding the difference signal to two different channels which correspond to the terminals of the color space area encompassed by the secondary partial signals, and controlling the opening and closing of the channels in accordance with the magnitude of the difference.
Claim 11
Dependent Claim
42 words
In a method according to claim 9, comprising the further steps of deriving an additional primary partial signal from a color measurement signal and providing the additional partial signal to each of the channels to aid in the opening and closing thereof.
Claim 12
Dependent Claim
36 words
In a method according to claim 7, wherein the further transformation of the partial secondary signals includes emphasizing those signals which lie intermediate the ends of the color space area encompassed by the secondary partial signals.
Claim 13
Dependent Claim
31 words
In a method according to claim 11, wherein the further transformation of the partial secondary signals includes providing that the difference between the two transformed signals is zero for predetermined colors.
Claim 14
Dependent Claim
59 words
In a method according to claim 11, where the further transformation of the partial secondary signals further includes feeding the difference signal to two different channels which correspond to the terminals of the color space area encompassed by the secondary partial signals, and controlling the opening and closing of the channels in accordance with the magnitude of the difference.
Claim 15
Dependent Claim
30 words
In a method according to claim 13, comprising the further step of providing an additional partial signal to each of the channels to aid in the opening and closing thereof.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |