US4896222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for correcting image signal
Assignee: Fujifilm Holdings Corp
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Filing: 1988-09-07
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Granted: 1990-01-23
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Expires: 2008-09-07
Abstract
Abstract An object such as a stimulable phosphor sheet on which image information is recorded is scanned by a light beam such as a laser beam, and light bearing the image information from the object is photoelectrically detected to produce an image signal representing the image information. A monitor signal representing the light beam is divided into a high-frequency component and a low-frequency component. A corrective signal is produced multiplying a ratio of the high-frequency component to the low-frequency component by a constant. The corrective signal is then subtracted from the image signal.
Inventors
- 👤 Nobutaka Fukai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:05
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/409
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
A method of correcting an image signal, comprising the steps of: scanning an object on which image information is recorded, with a light beam; photoelectrically detecting light bearing the image information from the object to produce an image signal representing the image information; producing a monitor signal representing the light beam; dividing the monitor signal representing said light beam into a high-frequency component and a low-frequency component; producing a corrective signal by multiplying a ratio of said high-frequency component to said low-frequency component by a constant; and processing said image signal with said corrective signal.
Claim 2
Independent Claim
95 words
A method of correcting an image signal, comprising the steps of: scanning an object on which image information is recorded, with a light beam; photoelectrically detecting light bearing the image information from the object to produce an image signal representing the image information; producing a monitor signal representing the light beam; dividing the monitor signal representing said light beam into a high-frequency component and a low-frequency component; producing a corrective signal by multiplying a ratio of said high-frequency component to said low-frequency component by a constant; and processing said image signal with said corrective signal.
Claim 3
Dependent Claim
22 words
A method according to claim 1, wherein said image signal is processed by substantially subtracting said corrective signal from said image signal.
Claim 4
Independent Claim
148 words
An apparatus for correcting an image signal, comprising: a light beam source for emitting a light beam; scanner means for scanning an object on which image information is recorded, with said light beam; photoelectric converter means for photoelectrically detecting light bearing the image information from the object to produce an image signal representing the image information; means for reading the image information based on said image signal; monitor means for monitoring the intensity of the light beam emitted from said light beam source; signal correcting means for dividing an output signal from said monitor means into a high-frequency component and a low-frequency component and for producing a corrective signal by multiplying a ratio of said high-frequency component to said low-frequency component by a constant; and processing means for processing said image signal produced by said photoelectric converter means with said corrective signal produced by said signal correcting means.
Claim 5
Independent Claim
148 words
An apparatus for correcting an image signal, comprising: a light beam source for emitting a light beam; scanner means for scanning an object on which image information is recorded, with said light beam; photoelectric converter means for photoelectrically detecting light bearing the image information from the object to produce an image signal representing the image information; means for reading the image information based on said image signal; monitor means for monitoring the intensity of the light beam emitted from said light beam source; signal correcting means for dividing an output signal from said monitor means into a high-frequency component and a low-frequency component and for producing a corrective signal by multiplying a ratio of said high-frequency component to said low-frequency component by a constant; and processing means for processing said image signal produced by said photoelectric converter means with said corrective signal produced by said signal correcting means.
Claim 6
Dependent Claim
23 words
An apparatus according to claim 3, wherein said processing means comprises subtracting means for substantially subtracting said corrective signal from said image signal.
Claim 7
Dependent Claim
14 words
A method according to claim 1, wherein said object is a stimulable phosphor sheet.
Claim 8
Dependent Claim
14 words
An apparatus according to claim 3, wherein said object is a stimulable phosphor sheet.
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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) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |