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US5032733A
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US
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Method for detecting unexposed regions
Assignee: Fujifilm Holdings Corp
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Filing: 1989-10-02
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Granted: 1991-07-16
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Expires: 2009-10-02
Abstract
Abstract After an image signal made up of a series of image signal components is detected from a recording medium on which a radiation image may be recorded, a characteristic value which represents the maximum change in the value of the image signal components corresponding to positions located along each of a plurality of lines distributed over the overall region or over a partial region of the recording medium is calculated. A representative value, which is representative of a plurality of the characteristic values, is calculated. Alternatively, after the image signal is detected, the probability density function of the image signal components corresponding to the overall region or to a partial region of the recording medium is created, and a characteristic amount, which represents a specific characteristic of the probability density function is found. The representative value or the characteristic amount is compared with a predetermined value. A judgment as to whether the region has or has not been exposed to radiation is based on the results of the comparison.
Inventors
- 👤 Hideya Takeo
- 👤 Takeshi Funahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:36
CPC Classifications
G; G06; G06T; G06T7/00; G06T7/0002; G06T7/0012; G01; G01T; G01T1/00; G01T1/16; G01T1/20; G01T1/2012; G01T1/2014; G06T2207/00; G06T2207/30; G06T2207/30004
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
159 words
A method for detecting an unexposed region, which comprises the steps of: i) after an image signal made up of a series of image signal components is detected from a recording medium on which a radiation image may be recorded, calculating a plurality of characteristic values, which represent the change in the values of the image signal components corresponding to positions located along each of a plurality of lines distributed over the overall region or over a partial region of said recording medium, from said image signal components corresponding to positions located along each said line, ii) calculating a representative value which is representative of said plurality of characteristic values calculated for the plurality of said lines, iii) comparing said representative value with a predetermined value, and iv) basing a judgment as to whether said region has or has not been exposed to radiation on the results of the comparison made between said representative value and said predetermined value.
Claim 2
Independent Claim
159 words
A method for detecting an unexposed region, which comprises the steps of: i) after an image signal made up of a series of image signal components is detected from a recording medium on which a radiation image may be recorded, calculating a plurality of characteristic values, which represent the change in the values of the image signal components corresponding to positions located along each of a plurality of lines distributed over the overall region or over a partial region of said recording medium, from said image signal components corresponding to positions located along each said line, ii) calculating a representative value which is representative of said plurality of characteristic values calculated for the plurality of said lines, iii) comparing said representative value with a predetermined value, and iv) basing a judgment as to whether said region has or has not been exposed to radiation on the results of the comparison made between said representative value and said predetermined value.
Claim 3
Independent Claim
121 words
A method for detecting an unexposed region, which comprises the steps of: i) after an image signal made up of a series of image signal components is detected from a recording medium on which a radiation image may be recorded, creating a probability density function of the image signal components corresponding to the overall region or to a partial region of said recording medium, ii) finding a characteristic amount which represents a specific characteristic of said probability density function, iii) comparing said characteristic amount with a predetermined amount, and iv) basing a judgment as to whether said region has or has not been exposed to radiation on the results of the comparison made between said characteristic amount and said predetermined amount.
Claim 4
Independent Claim
121 words
A method for detecting an unexposed region, which comprises the steps of: i) after an image signal made up of a series of image signal components is detected from a recording medium on which a radiation image may be recorded, creating a probability density function of the image signal components corresponding to the overall region or to a partial region of said recording medium, ii) finding a characteristic amount which represents a specific characteristic of said probability density function, iii) comparing said characteristic amount with a predetermined amount, and iv) basing a judgment as to whether said region has or has not been exposed to radiation on the results of the comparison made between said characteristic amount and said predetermined amount.
References Cited (Backward Citations)
US4239384A
Cited
US4258264A
Cited
US4315318A
Cited
US4276473A
Cited
JPS5611395A
Cited
US4387428A
Cited
US4527060A
Cited
US4585352A
Cited
US4575251A
Cited
US4655581A
Cited
JPS615193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-15 | 1995-01-14 | 1995-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-15 | 1999-01-14 | 1999-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-15 | 2003-01-14 | 2003-07-16 | $7700.00 | Window Closed / Lapsed |