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US3663110A
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Apparatus responsive to optical density wherein an unknown sample density is compared to a stored value
Assignee: Eastman Kodak Co
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Filing: 1971-04-05
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Granted: 1972-05-16
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Expires: 1991-04-05
Abstract
Abstract A set of digitized values of a density-dependent variable are stored in computer memory. A corresponding set of digitized photoelectric signals, produced from a set of reference densities, are also stored in computer memory. An unknown sample density is photoelectrically examined, the resultant signal being digitized and searched for within the computer memory, thereby to gate out of memory the digitized value of the density-dependent variable that corresponds to the digitized photoelectric signal of the sample.
Inventors
- 👤 Bradley D Rising
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:12
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/27
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
147 words
Apparatus responsive to optical density comprising: a. photoelectric means for examining optical densities and for producing signals proportional to said densities, b. means for digitizing said signals, c. means for storing a first set of signals representing digitized values of a density-dependent variable and a corresponding second set of digitized signals produced in response to the examination of a set of standard densities by said photoelectric means, d. means cooperative with said signal digitizing means for searching and identifying within said storing means the stored signal of said second set which is most nearly the equivalent of the output of said signal digitizing means, and e. means cooperative with said searching means for gating out of said storing means the digitized signal of said first set that is representative of the pArticular value of said densitydependent variable that most nearly corresponds with said identified second set signal.
Claim 2
Dependent Claim
147 words
Apparatus responsive to optical density comprising: a. photoelectric means for examining optical densities and for producing signals proportional to said densities, b. means for digitizing said signals, c. means for storing a first set of signals representing digitized values of a density-dependent variable and a corresponding second set of digitized signals produced in response to the examination of a set of standard densities by said photoelectric means, d. means cooperative with said signal digitizing means for searching and identifying within said storing means the stored signal of said second set which is most nearly the equivalent of the output of said signal digitizing means, and e. means cooperative with said searching means for gating out of said storing means the digitized signal of said first set that is representative of the pArticular value of said densitydependent variable that most nearly corresponds with said identified second set signal.
Claim 3
Dependent Claim
19 words
The apparatus of claim 1 wherein the signals of said first set of signals represent values of optical density.
Claim 4
Dependent Claim
21 words
The apparatus of claim 1 wherein the signals of said first set of signals represent density-dependent times for making photographic exposures.
Claim 5
Dependent Claim
121 words
The apparatus of claim 1 wherein said apparatus includes: a. means, cooperative with said means for searching, for identifying the pair of stored second set of signals which are respectively just greater and just less than the signal output of said digitizing means, b. means cooperative with said gating means for gating out of said storing means at least one first set signal corresponding to one signal in said pair of first set signals, and c. computing means, adapted to receive said pair of second set signals and said first set signal, for interpolating between said second set signals to produce a signal representing the particular value of said density-dependent variable that corresponds with the signal output of said digitizing means.
Claim 6
Dependent Claim
19 words
The apparatus of claim 4 wherein the signals of said first set of signals represent values of optical density.
Claim 7
Dependent Claim
21 words
The apparatus of claim 4 wherein the signals of said first set of signals represent density-dependent times for making photographic exposures.
References Cited (Backward Citations)
US3449586A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |