US3644664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Correction level adjustment for video negative analyzer
Assignee: Eastman Kodak Co
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Filing: 1970-03-16
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Granted: 1972-02-22
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Expires: 1990-03-16
Abstract
Abstract Photographic color negatives are scanned to produce red, green and blue color signals representative of the respective red, green and blue transmission densities of the negative to control the electronic reproduction of the negative as a visual image. The visual image is created by the sequential reconstruction of the red, green and blue components of the negative scene over a predetermined time period. A logic circuit receives the red, green and blue color signals during sequential time periods and stores the red, green and blue color signals over the total time period. A color correction circuit including at least three matrixes of impedance elements receives each of the color signals to provide a sequential color correction signal for each color signal dependent upon the response of the other color signals over the total time period. The impedance elements of the matrixes may be adjusted to provide color correction signals dependent upon the various characteristics of the printer on which the negative is to be printed.
Inventors
- 👤 Robert W Huboi
- 👤 Edward M Waz
- 👤 Thomas G Seckel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:37
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/603
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
219 words
Apparatus for facilitating the color correction of a plurality of input color signals representing the densities of the component colors of a color image, said apparatus comprising: a. radiation-sensitive means for sequentially generating an input color signal corresponding to the densities of each of the component colors of the color image; b. first circuit means responsive to the input color signals for providing continuously, during the sequential generation of each input color signal, a plurality of output color signals representative of each of the plurality of input color signals; c. a corresponding plurality of matrix means responsive to the output color signals for providing a corresponding plurality of color correction signals dependent, in a predetermined relationship, upon the densities of the other component colors of the color image, each of said matrix means comprising a corresponding plurality of impedance means preset in a predetermined relationship and responsive to each of the output color signals to vary the output color signals in proportion to the preset relationship of the impedance means and to produce a color correction signal for each of the component colors of the color image; and d. second circuit means for applying each of the color correction signals to said radiation-sensing means to vary the sensitivity thereof to each of the component colors of the color image.
Claim 2
Dependent Claim
219 words
Apparatus for facilitating the color correction of a plurality of input color signals representing the densities of the component colors of a color image, said apparatus comprising: a. radiation-sensitive means for sequentially generating an input color signal corresponding to the densities of each of the component colors of the color image; b. first circuit means responsive to the input color signals for providing continuously, during the sequential generation of each input color signal, a plurality of output color signals representative of each of the plurality of input color signals; c. a corresponding plurality of matrix means responsive to the output color signals for providing a corresponding plurality of color correction signals dependent, in a predetermined relationship, upon the densities of the other component colors of the color image, each of said matrix means comprising a corresponding plurality of impedance means preset in a predetermined relationship and responsive to each of the output color signals to vary the output color signals in proportion to the preset relationship of the impedance means and to produce a color correction signal for each of the component colors of the color image; and d. second circuit means for applying each of the color correction signals to said radiation-sensing means to vary the sensitivity thereof to each of the component colors of the color image.
Claim 3
Dependent Claim
71 words
Apparatus as claimed in claim 1 further comprising: a. synchronizing means for providing a plurality of timing signals indicative of the sequential generation of each of the input color signals by said radiation-sensitive means; and wherein said second circuit means further comprises b. first switching means responsive to each of said plurality of timing signals for sequentially applying said color correction signals to said radiation-sensitive means to vary the sensitivity thereof.
Claim 4
Dependent Claim
140 words
Apparatus as claimed in claim 1 wherein said first circuit means further comprises: a. a plurality of capacitors each having a first and a second terminal; b. second switching means responsive to each of said plurality of timing signals for applying one of the input color signals to the first terminal of one of said capacitors; and c. a plurality of differentia amplifier means each having first and second input terminals and an output terminal, said first input terminal of each of said differential amplifier means being connected to said second terminal of one of said capacitors, said second input terminal of said differential amplifier means being commonly connected to receive all of the input color signals, and said output terminals of said differential amplifier means being commonly connected to an individual impedance means of each of said matrix means.
Claim 5
Dependent Claim
153 words
Apparatus as claimed in claim 1 wherein said first circuit means further comprises: a. a plurality of capacitors each having a first and a second terminal; b. means for commonly applying the input color signals to the first terminals of said capacitors; c. second switching means responsive to the sequential timing signals for sequentially charging the plurality of capacitors to a voltage level dependent upon the input color signals; and d. a plurality of differential amplifiers each having a first commonly connected input terminal, a second input terminal connected to the second terminals of said capacitors and an output terminal connected to one impedance of each of said matrix means, each differential amplifier comprising means responsive to the difference between the voltage levels on each of said capacitors and the voltage level of the input color signals for producing said output color signals continuously during the sequential generation of each input color signal.
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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |