US3977795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of determining the modulation transfer function
Assignee: Agfa Gevaert AG
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Filing: 1974-02-11
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Granted: 1976-08-31
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Expires: 1994-02-11
Abstract
Abstract The invention relates to a method of determining the modulation transfer function of a recording support or of an optical system. In the context of the invention, an optical system includes any components with finite apertures which are required for forming an image of an object. A coherent-optically produced scatterer of known noise distribution or with a known spatial frequency spectrum is used for determining the required modulation transfer function. The modulation transfer function can be determined through the density of transparency distributions present on the recording support.
Inventors
- 👤 Hans-Theo Buschmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:33
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/48; G01; G01M; G01M11/00; G01M11/02; G01M11/0292
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
96 words
In a method of determining the modulation transfer function of a recording system, the steps of illuminating a photographic plate with the coherent light of a laser beam through a diffuser and subsequent aperture, and then processing that exposed photographic plate to produce a scatterer of known noise distribution; the further steps of projecting the scatterer with incoherent light onto the recording system to be tested, then subjecting the recording system to photographic processing and then, scanning the image on the processed recording system with a microphotometer whose output signal is subjected to a correlation analysis.
Claim 2
Dependent Claim
96 words
In a method of determining the modulation transfer function of a recording system, the steps of illuminating a photographic plate with the coherent light of a laser beam through a diffuser and subsequent aperture, and then processing that exposed photographic plate to produce a scatterer of known noise distribution; the further steps of projecting the scatterer with incoherent light onto the recording system to be tested, then subjecting the recording system to photographic processing and then, scanning the image on the processed recording system with a microphotometer whose output signal is subjected to a correlation analysis.
Claim 3
Dependent Claim
32 words
A method as claimed in claim 1 wherein, in addition to the projected scatterer, a comparison zone is projected on to the recording system with incoherent diffuse light of the same intensity.
Claim 4
Dependent Claim
19 words
A method as claimed in claim 1, wherein the density distribution on the recording support is scanned by translation.
Claim 5
Dependent Claim
19 words
A method as claimed in claim 1 wherein the density distribution on the recording support is scanned by rotation.
Claim 6
Dependent Claim
27 words
A method as claimed in claim 1, wherein the scatterer is projected in the form of a contact copy on to the recording support to be tested.
Claim 7
Dependent Claim
31 words
A method as claimed in claim 5 wherein, in addition to the projected scatterer, a comparison zone is projected onto the recording support with incoherent diffuse light of the same intensity.
Claim 8
Dependent Claim
16 words
A method as claimed in claim 5, wherein white light is used to project the scatterer.
Claim 9
Dependent Claim
20 words
A method as claimed in claim 5, wherein light with a selected spectral distribution is used for projecting the scatterer.
Claim 10
Dependent Claim
15 words
A method as claimed in claim 7, wherein the microphotometer is operated with white light.
Claim 11
Dependent Claim
27 words
A method as claimed in claim 7, wherein the microphotometer is preceded by filters for eliminating all light except that in a selected region of the spectrum.
References Cited (Backward Citations)
US3519358A
Cited
US3708217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |