US5032733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 13:29
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.
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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) | 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 |