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US5081356A
Expired / Lapsed
US
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Image read-out apparatus
Assignee: Fujifilm Holdings Corp
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Filing: 1991-01-17
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Granted: 1992-01-14
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Expires: 2011-01-17
Abstract
Abstract In an image read-out apparatus, a recording medium, on which an image has been recorded, is two-dimensionally scanned with a light beam. Light, which is radiated out of the recording medium during the scanning and which represents the image, is detected with a photoelectric sensor, and a time-serial image signal is thereby generated. In the course of generating the image signal, a peak value dectector sequentially detects peak values occurring at parts of the image signal. A light detecting sensitivity controller controls the sensitivity, with which the photoelectric sensor detects the light radiated out of the recording medium, in accordance with the peak values, which have been detected sequentially, such that the value of the image signal does not exceed a predetermined value. A correction device corrects the image signal in accordance with a signal representing the sensitivity, with which the photoelectric sensor detects the light radiated out of the recording medium.
Inventors
- 👤 Kazuo Horikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:04
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/20; G01T1/2012; G01T1/2014
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
166 words
An image read-out apparatus for two-dimensionally scanning a recording medium, on which an image has been recorded, with a light beam, and detecting light, which is radiated out of the recording medium during the scanning and which represents the image, with a photoelectric sensor, a time-serial image signal being thereby generated, wherein the improvement comprises the provision of: i) a peak value detecting means which, in the course of generating said image signal, sequentially detects peak values occurring at parts of said image signal, ii) a light detecting sensitivity control means for controlling the sensitivity, with which said photoelectric sensor detects the light radiated out of said recording medium, in accordance with said peak values, which have been detected sequentially, such that the value of said image signal does not exceed a predetermined value, and iii) a correction means for correcting said image signal in accordance with a signal representing the sensitivity, with which said photoelectric sensor detects the light radiated out of said recording medium.
Claim 2
Dependent Claim
166 words
An image read-out apparatus for two-dimensionally scanning a recording medium, on which an image has been recorded, with a light beam, and detecting light, which is radiated out of the recording medium during the scanning and which represents the image, with a photoelectric sensor, a time-serial image signal being thereby generated, wherein the improvement comprises the provision of: i) a peak value detecting means which, in the course of generating said image signal, sequentially detects peak values occurring at parts of said image signal, ii) a light detecting sensitivity control means for controlling the sensitivity, with which said photoelectric sensor detects the light radiated out of said recording medium, in accordance with said peak values, which have been detected sequentially, such that the value of said image signal does not exceed a predetermined value, and iii) a correction means for correcting said image signal in accordance with a signal representing the sensitivity, with which said photoelectric sensor detects the light radiated out of said recording medium.
Claim 3
Dependent Claim
24 words
An apparatus as defined in claim 1 wherein said recording medium is a stimulable phosphor sheet on which a radiation image has been stored.
Claim 4
Dependent Claim
61 words
An apparatus as claimed in claim 2 wherein an image signal representing said radiation image is generated by exposing said stimulable phosphor sheet to said light beam of stimulating rays, said stimulating rays causes stimulable phosphor sheet to emit light in proportion to the amount of energy stored thereon during its exposure to radiation, and the emitted light is directed photoelectrically.
Claim 5
Dependent Claim
15 words
An apparatus as defined in claim 3 wherein said stimulating rays are a laser beam.
Claim 6
Dependent Claim
14 words
An apparatus as defined in claim 1 wherein said recording medium is photographic film.
Claim 7
Dependent Claim
14 words
An apparatus as defined in claim 1 wherein said photoelectric sensor is a photomultiplier.
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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) | 1995-01-13 | 1995-07-15 | 1996-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-13 | 1999-07-15 | 2000-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-13 | 2003-07-15 | 2004-01-14 | $7700.00 | Window Closed / Lapsed |