US5231574A
Expired / Lapsed
US
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Method for detecting artifact signal components
Assignee: Fujifilm Holdings Corp
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Filing: 1990-04-03
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Granted: 1993-07-27
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Expires: 2010-04-03
Abstract
Abstract A method for detecting artifact signal components comprises the steps of detecting an image signal made up of a series of image signal components representing a radiation image from a recording medium on which the radiation image has been recorded. Specific image signal components, which have values smaller than a predetermined threshold value, are detected from the image signal. Investigation is made to find how many neighboring picture elements the specific image signal components correspond to. In cases where the number of the neighboring picture elements is smaller than a predetermined number, it is determined that the specific image signal components are artifact signal components.
Inventors
- 👤 Toshitaka Agano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:22
CPC Classifications
G; G06; G06T; G06T5/00; G06T5/20; A; A61; A61B; A61B6/00; A61B6/52; A61B6/5258; H; H04; H04N; H04N1/00; H04N1/40; H04N1/409; H04N1/4097; Y; Y10; Y10S; Y10S250/00; Y10S250/909
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
191 words
A method for detecting artifact signal components, which comprises the steps of: i) detecting an image signal made up of a series of image signal components representing a radiation image from a recording medium on which the radiation image has been recorded, ii) sampling said image signal components to determine values of said image signal components, iii) comparing said values of said image signal components directly with a predetermined threshold value, iv) detecting specific image signal components based upon said comparison, where said values of said specific image signal components are smaller than said predetermined threshold value, v) for each of said specific image signal components evaluating all of the contiguous image signal components to determine which of said contiguous image signal components are specific image signal components; vi) determining for each of said specific image signal components the number of contiguous image signal components which have been detected as specific image signal components, and vii) in cases where the number of said contiguous image signal components determined to be specific image signal components is smaller than a predetermined number, determining that said specific image signal components are artifact signal components.
Claim 2
Independent Claim
191 words
A method for detecting artifact signal components, which comprises the steps of: i) detecting an image signal made up of a series of image signal components representing a radiation image from a recording medium on which the radiation image has been recorded, ii) sampling said image signal components to determine values of said image signal components, iii) comparing said values of said image signal components directly with a predetermined threshold value, iv) detecting specific image signal components based upon said comparison, where said values of said specific image signal components are smaller than said predetermined threshold value, v) for each of said specific image signal components evaluating all of the contiguous image signal components to determine which of said contiguous image signal components are specific image signal components; vi) determining for each of said specific image signal components the number of contiguous image signal components which have been detected as specific image signal components, and vii) in cases where the number of said contiguous image signal components determined to be specific image signal components is smaller than a predetermined number, determining that said specific image signal components are artifact signal components.
Claim 3
Dependent Claim
28 words
A method as defined in claim 1 wherein the number of said contiguous picture elements is counted along each row or column of an array of picture elements.
Claim 4
Dependent Claim
30 words
A method as defined in claim 1 wherein the number of said contiguous picture elements is counted along a plurality of rows and columns of an array of picture elements.
Claim 5
Dependent Claim
24 words
A method as defined in claim 1 wherein said recording medium is a stimulable phosphor sheet on which a radiation image has been stored.
Claim 6
Dependent Claim
56 words
A method as defined in claim 1 wherein said image signal is obtained from a read-out operation wherein said stimulable phosphor sheet is exposed to stimulating rays which cause said stimulable phosphor sheet to emit light in proportion to an amount of energy stored thereon during exposure to radiation, and the emitted light is detected photoelectrically.
Claim 7
Dependent Claim
15 words
A method as defined in claim 5 wherein said stimulating rays are a laser beam.
Claim 8
Dependent Claim
14 words
A method as defined in claim 1 wherein said recording medium is photographic film.
References Cited (Backward Citations)
US4258264A
Cited
US4315318A
Cited
US4276473A
Cited
JPS5611395A
Cited
US4387428A
Cited
JPS615193A
Cited
US4703537A
Cited
US4747156A
Cited
US4992663A
Cited
US4933775A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-26 | 1997-01-25 | 1997-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-26 | 2001-01-25 | 2001-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-26 | 2005-01-25 | 2005-07-27 | $7700.00 | Window Closed / Lapsed |