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US4450485A
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Image scanning and recording method
Assignee: Fujifilm Holdings Corp
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Filing: 1982-05-18
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Granted: 1984-05-22
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Expires: 2002-05-18
Abstract
Abstract An image scanning and recording method wherein a random pulse signal is added either to the image signal obtained by scanning a continuous tone original or to the dot signal controlled synchronously with the scanning of the original. The image signal and the dot signal are compared with each other to obtain a randomized dot image signal. A light beam is on-off modulated by a light modulator in accordance with the randomized dot image signal, and a photosensitive recording medium is scanned with the on-off modulated light beam so as to record thereon a dot image corresponding to the continuous tone original. The random pulse signal is added to a peak portion and/or a middle level portion of the dot signal. Alternatively, the random pulse signal is added contiguously either to the whole dot signal or to the whole image signal.
Inventors
- 👤 Yuji Oshikoshi
- 👤 Toshitaka Agano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:56
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/405; H04N1/4055
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
113 words
An image scanning and recording method for scanning a continuous tone original and recording a reproduction thereof on a recording medium, said method comprising the steps of: adding a random pulse signal to a selected one of an image signal obtained by scanning the continuous tone original and a dot signal controlled synchronously with said scanning of the original; comparing said image signal with said dot signal to obtain a randomized dot image signal; on-off modulating a light beam in accordance with said randomized dot image signal; and scanning a photosensitive recording medium with said on-off modulated light beam so as to record thereon a dot image corresponding to said continuous tone original.
Claim 2
Dependent Claim
113 words
An image scanning and recording method for scanning a continuous tone original and recording a reproduction thereof on a recording medium, said method comprising the steps of: adding a random pulse signal to a selected one of an image signal obtained by scanning the continuous tone original and a dot signal controlled synchronously with said scanning of the original; comparing said image signal with said dot signal to obtain a randomized dot image signal; on-off modulating a light beam in accordance with said randomized dot image signal; and scanning a photosensitive recording medium with said on-off modulated light beam so as to record thereon a dot image corresponding to said continuous tone original.
Claim 3
Dependent Claim
34 words
A method as defined in claim 1 further comprising the step of adding said random pulse signal to said dot signal intermittently and periodically at time instances which are synchronous with said dot signal.
Claim 4
Dependent Claim
26 words
A method as defined in claim 1, further comprising the step of adding said random pulse signal to said dot signal at irregular periods of repetition.
Claim 5
Dependent Claim
16 words
A method as defined in claim 2 wherein said random pulse signal has regularity of repetition.
Claim 6
Independent Claim
35 words
A method as defined in any of claims 1 to 4 wherein said random pulse signal is added to a selected one of a peak portion and a middle level portion of said dot signal.
Claim 7
Dependent Claim
29 words
A method as defined in claim 1 wherein said random pulse signal is added contiguously to a selected one of the whole dot signal and the whole image signal.
Claim 8
Dependent Claim
18 words
A method as defined in claim 6 wherein said random pulse signal does not have regularity of repetition.
Claim 9
Dependent Claim
16 words
A method as defined in claim 6 wherein said random pulse signal has regularity of repetition.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |