US4402015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Picture signal pre-processing method for a picture reproducing machine
Assignee: Dainippon Screen Manufacturing Co Ltd
•
Filing: 1981-01-09
•
Granted: 1983-08-30
•
Expires: 2001-01-09
Abstract
Abstract A method for pre-processing a picture signal prior to an operational circuit of a picture reproducing machine such as a color scanner and a color facsimile, wherein an original picture is scanned photoelectrically to obtain the picture signal, wherein first conversion characteristics data stored in a memory are read out by addressing addresses of the memory by the picture signal, and then are changed by second conversion characteristics data depending on a desired reproducible density range of the original picture.
Inventors
- 👤 Mitsuhiko Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:49
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/407; H04N1/46; H04N1/56; H04N1/60; H04N1/6027
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
A method for pre-processing a picture signal prior to an operational circuit of a picture reproducing machine wherein an original picture is scanned photoelectrically to obtain the picture signal, comprising the steps of: (a) reading out first conversion characteristic data stored in a memory which disposed at the prior stage of a preprocessor means so that a desired reproductible density range of an original picture may be converted to a density range which can be processed by operation of said picture reproducing machine by addressing addresses of the memory by the picture signal; and (b) changing the first conversion characteristic data by second conversion characteristic data depending on a desired reproducible density range of the original picture.
Claim 2
Independent Claim
117 words
A method for pre-processing a picture signal prior to an operational circuit of a picture reproducing machine wherein an original picture is scanned photoelectrically to obtain the picture signal, comprising the steps of: (a) reading out first conversion characteristic data stored in a memory which disposed at the prior stage of a preprocessor means so that a desired reproductible density range of an original picture may be converted to a density range which can be processed by operation of said picture reproducing machine by addressing addresses of the memory by the picture signal; and (b) changing the first conversion characteristic data by second conversion characteristic data depending on a desired reproducible density range of the original picture.
Claim 3
Dependent Claim
27 words
A method as defined in claim 1, wherein the first conversion characteristics data is stored in a first memory or a second memory which are alternately used.
Claim 4
Dependent Claim
20 words
A method as defined in claim 1, wherein the address span of the first conversion characteristics data curve is changed.
Claim 5
Dependent Claim
20 words
A method as defined in claim 1, wherein the conversion characteristics curve of the first conversion characteristics data is changed.
Claim 6
Dependent Claim
21 words
A method as defined in claim 3 or 4, wherein a deviation correction value is contained in the conversion characteristics data.
Claim 7
Dependent Claim
22 words
A method as defined in claim 3 or 4, wherein a non-linear distortion correction value is contained in the conversion characteristics data.
References Cited (Backward Citations)
US3729584A
Cited
US4058828A
Cited
US4250522A
Cited
US4305093A
Cited
US4346409A
Cited
US4307415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |