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US4075662A
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Method and system for compensating the non-linearities in a reproduction process
Assignee: Heidelberger Druckmaschinen AG
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Filing: 1976-06-08
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Granted: 1978-02-21
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Expires: 1996-06-08
Abstract
Abstract A method of calibrating a reproduction apparatus having a sensor device for generating sensor signals by optically scanning a picture original and a recording device controlled by recording signals for recording the picture original on a film, comprising the steps: generating a set of first signals for said recording device to produce a sample gray scale on the film having a predetermined first range of gray scale values; generating and storing a set of second signals corresponding respectively to said first signals; generating a set of third signals corresponding substantially to the gray scale values of said sample recorded gray scale; correlating said third signals to said first signals; generating a set of fourth signals representing a predetermined second range of gray scale values of a reference gray scale; substantially correlating a first group of at least some of said fourth signals to a second group of at least some of said third signals for obtaining said second signals; and storing said second signals in a storage device having addresses corresponding to the fourth signals of said first group, whereby a substantially generated sensor signal for a given gray scale value by the picture original can be used to select a recording signal from a stored second signal of said second group by a correlated fourth signal suitable for obtaining a substantially duplicate gray scale value. The invention also relates to a system for calibrating the reproduction apparatus.
Inventors
- 👤 Winrich Gall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:04
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/407; H04N1/4076; H04N1/4078; H04N1/46; H04N1/56; H04N1/60; H04N1/6027; H04N1/603; H04N1/6033
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
226 words
A method of calibrating a reproduction apparatus having a sensor device for generating sensor signals by optically scanning a picture original and a recording device controlled by recording signals for recording the picture original on a film, comprising the steps; generating a set of first signals for said recording device to produce a sample gray scale on the film having a predetermined first range of gray scale values; generating and storing a set of second signals corresponding respectively to said first signals; generating a set of third signals corresponding substantially to the gray scale values of said sample recorded gray scale; correlating said third signals to said first signals; generating a set of fourth signals representing a predetermined second range of gray scale values of a reference gray scale; substantially correlating a first group of at least some of said fourth signals to a second group of at least some of said third signals for obtaining said second signals; and storing said second signals in a storage device having addresses corresponding to the fourth signals of said first group, whereby a substantially generated sensor signal for a given gray scale value by the picture original can be used to select a recording signal from a stored second signal of said second group by a correlated fourth signal suitable for obtaining a substantially duplicate gray scale value.
Claim 2
Independent Claim
226 words
A method of calibrating a reproduction apparatus having a sensor device for generating sensor signals by optically scanning a picture original and a recording device controlled by recording signals for recording the picture original on a film, comprising the steps; generating a set of first signals for said recording device to produce a sample gray scale on the film having a predetermined first range of gray scale values; generating and storing a set of second signals corresponding respectively to said first signals; generating a set of third signals corresponding substantially to the gray scale values of said sample recorded gray scale; correlating said third signals to said first signals; generating a set of fourth signals representing a predetermined second range of gray scale values of a reference gray scale; substantially correlating a first group of at least some of said fourth signals to a second group of at least some of said third signals for obtaining said second signals; and storing said second signals in a storage device having addresses corresponding to the fourth signals of said first group, whereby a substantially generated sensor signal for a given gray scale value by the picture original can be used to select a recording signal from a stored second signal of said second group by a correlated fourth signal suitable for obtaining a substantially duplicate gray scale value.
Claim 3
Dependent Claim
22 words
A method as claimed in claim 1, wherein said first, second, third, and fourth signals are in the form of digital signals.
Claim 4
Dependent Claim
23 words
The method as claimed in claim 1, wherein said first and second gray scale values extend over the same range of gray values.
Claim 5
Dependent Claim
16 words
The method as claimed in claim 3, wherein said gray values extend from "white" to "black".
Claim 6
Dependent Claim
54 words
The method as claimed in claim 1, wherein said step of correlating said first and second groups comprises the step of selecting a fourth signal and comparing it to said third signals until substantial equality is obtained for a given third signal, and then storing the second signal corresponding to said given third signal.
Claim 7
Dependent Claim
24 words
The method as claimed in claim 1, wherein the correlation of said first and second groups is carried out through the use of interpolation.
Claim 8
Dependent Claim
23 words
The method as claimed in claim 1, wherein said set of first signals is generated through the use of a step voltage generator.
Claim 9
Dependent Claim
26 words
A method as claimed in claim 1, wherein said set of first signals is generated through the use of an optical-electrical scanning of a gray scale.
Claim 10
Independent Claim
257 words
An apparatus for callibrating a reproduction apparatus having a sensor device for generating sensor signals by optically scanning a picture original and a recording device controlled by recording signals for recording the picture original on a film, comprising in combination: first means operable for generating a set of first signals for said recording device to produce a sample gray scale on the film having a predetermined first range of gray scale values; second means operable for generating and storing a set of second signals corresponding respectively to said first signals; third means operable for generating a set of third signals corresponding substantially to the gray scale values of said recorded sample gray scale; fourth means operable for correlating said third signals to said first signals; fifth means operable for generating a set of fourth signals representing a predetermined second range of gray scale values of a reference gray scale; sixth means operable for substantially correlating a first group of at least some of said fourth signals to a second group of at least some of said third signals for obtaining said second signals; a storage device; and seventh means operable for storing said second signals in said storage device having addresses corresponding to the fourth signals of said first group, whereby a substantially generated sensor signal for a given gray scale value by the picture original can be used to select a recording signal from a stored second signal of said second group by a correlated fourth signal suitable for obtaining a substantially duplicate gray scale value.
Claim 11
Independent Claim
257 words
An apparatus for callibrating a reproduction apparatus having a sensor device for generating sensor signals by optically scanning a picture original and a recording device controlled by recording signals for recording the picture original on a film, comprising in combination: first means operable for generating a set of first signals for said recording device to produce a sample gray scale on the film having a predetermined first range of gray scale values; second means operable for generating and storing a set of second signals corresponding respectively to said first signals; third means operable for generating a set of third signals corresponding substantially to the gray scale values of said recorded sample gray scale; fourth means operable for correlating said third signals to said first signals; fifth means operable for generating a set of fourth signals representing a predetermined second range of gray scale values of a reference gray scale; sixth means operable for substantially correlating a first group of at least some of said fourth signals to a second group of at least some of said third signals for obtaining said second signals; a storage device; and seventh means operable for storing said second signals in said storage device having addresses corresponding to the fourth signals of said first group, whereby a substantially generated sensor signal for a given gray scale value by the picture original can be used to select a recording signal from a stored second signal of said second group by a correlated fourth signal suitable for obtaining a substantially duplicate gray scale value.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |