US5187752A
Expired / Lapsed
US
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Method for determining image points in object images
Assignee: Fujifilm Holdings Corp
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Filing: 1990-04-10
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Granted: 1993-02-16
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Expires: 2010-04-10
Abstract
Abstract A method for determining an image point in an object image composed of the steps of detecting an image signal made up of a series of image signal components representing respective picture elements in a radiation image, which includes an object image and which has been recorded on a recording medium. The center of gravity of the object on the recording medium is found from the image signal by weighting the respective picture elements with corresponding absolute values of differentiated values resulting from the carrying out of differentiation processing on the image signal values corresponding to the respective picture elements. A position, at which the center of gravity is located, is determined as the image point in the object image.
Inventors
- 👤 Hideya Takeo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:17
CPC Classifications
G; G06; G06T; G06T7/00; G06T7/60; G06T7/66; G06T2207/00; G06T2207/10; G06T2207/10116
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
132 words
A method of selecting an image point of an object image recorded on a recording medium, said selected image point representing a center of gravity of said object image and said object image being constituted of a plurality of picture elements, the method comprising the steps of: converting said picture elements into electrical signals representative of image values of said plurality of picture elements; differentiating said electrical signals and producing differentiated signals having absolute values corresponding to said plurality of picture elements; weighting each picture element of said object image with its corresponding absolute value produced in said differentiating step; and processing said weighted picture elements to obtain an average value thereof, wherein the center of gravity of said object image is represented by the picture element corresponding to said average value.
Claim 2
Independent Claim
132 words
A method of selecting an image point of an object image recorded on a recording medium, said selected image point representing a center of gravity of said object image and said object image being constituted of a plurality of picture elements, the method comprising the steps of: converting said picture elements into electrical signals representative of image values of said plurality of picture elements; differentiating said electrical signals and producing differentiated signals having absolute values corresponding to said plurality of picture elements; weighting each picture element of said object image with its corresponding absolute value produced in said differentiating step; and processing said weighted picture elements to obtain an average value thereof, wherein the center of gravity of said object image is represented by the picture element corresponding to said average value.
Claim 3
Dependent Claim
75 words
A method as defined in claim 1, further comprising the steps of comparing an image value of said electrical signal corresponding to the picture element representing the center of gravity of said object image to a predetermined image value corresponding to a predetermined image density, and judging said picture element corresponding to said average value as a true image point in said object image when said image value is larger than said predetermined image value.
Claim 4
Dependent Claim
21 words
A method as defined in claim 1, wherein said recording medium is a stimulable phosphor sheet for storing a radiation image.
Claim 5
Dependent Claim
56 words
A method as defined in claim 3, wherein said converting step comprises the steps of: exposing said stimulable phosphor sheet to stimulating rays which cause said stimulable phosphor sheet to emit light in proportion to the amount of energy stored thereon during exposure to radiation; and photoelectrically detecting said light emitted from said stimulable phosphor sheet.
Claim 6
Dependent Claim
39 words
A method as defined in claim 4, wherein the steps of converting further comprising, prior to the steps of exposing and detecting, scanning said stimulable phosphor sheet to ascertain approximately the radiation image stored on said stimulable phosphor sheet.
Claim 7
Dependent Claim
17 words
A method as defined in claim 4, wherein said stimulating rays are produced by a laser medium.
Claim 8
Dependent Claim
15 words
A method as defined in claim 1, wherein said recording medium is a photographic film.
Claim 9
Dependent Claim
37 words
A method as defined in claim 1, wherein said processing step further comprises the step of summing said absolute values corresponding to said plurality of picture elements in each of two different directions across said object image.
Claim 10
Dependent Claim
68 words
A method as defined in claim 8, wherein said processing step further comprises the step of producing a summation of weighted picture elements in each of said two different directions across said object image, and dividing said summation with the result produced in said summing step, for each of said two different directions, to thereby produce the picture element representing the center of gravity of said object image.
Claim 11
Independent Claim
200 words
A method of selecting an image point of an object image recorded on a recording medium, said selected image point representing a center of gravity of said object image and said object image being constituted of a plurality of picture elements, the method comprising the steps of: converting said picture elements into electrical signals representative of image values of said plurality of picture elements; differentiating said electrical signals and producing differentiated signals having absolute values corresponding to said plurality of picture elements; producing an array of said absolute values such that positions in said array respectively correspond to said plurality of picture elements of said object image; accumulating said absolute values along each of two different directions on said array, and plotting the resulting accumulated values along each of said two different directions so as to depict the distributions of said accumulated values along said two different directions; and detecting a coordinate point along each of said two different directions, for which point said accumulated value is approximately one-half of the maximum accumulated value, from each of said distributions of said accumulated values, wherein said image point is taken as the picture element corresponding to said coordinate points thus detected.
Claim 12
Independent Claim
200 words
A method of selecting an image point of an object image recorded on a recording medium, said selected image point representing a center of gravity of said object image and said object image being constituted of a plurality of picture elements, the method comprising the steps of: converting said picture elements into electrical signals representative of image values of said plurality of picture elements; differentiating said electrical signals and producing differentiated signals having absolute values corresponding to said plurality of picture elements; producing an array of said absolute values such that positions in said array respectively correspond to said plurality of picture elements of said object image; accumulating said absolute values along each of two different directions on said array, and plotting the resulting accumulated values along each of said two different directions so as to depict the distributions of said accumulated values along said two different directions; and detecting a coordinate point along each of said two different directions, for which point said accumulated value is approximately one-half of the maximum accumulated value, from each of said distributions of said accumulated values, wherein said image point is taken as the picture element corresponding to said coordinate points thus detected.
Claim 13
Dependent Claim
75 words
A method as defined in claim 10, further comprising the steps of comparing an image value of said electrical signal corresponding to the picture element representing the center of gravity of said object image to a predetermined image value corresponding to a predetermined image density, and judging said picture element corresponding to said average value as a true image point in said object image when said image value is larger than said predetermined image value.
Claim 14
Dependent Claim
21 words
A method as defined in claim 10, wherein said recording medium is a stimulable phosphor sheet for storing a radiation image.
Claim 15
Dependent Claim
56 words
A method as defined in claim 12, wherein said converting step comprises the steps of: exposing said stimulable phosphor sheet to stimulating rays which cause said stimulable phosphor sheet to emit light in proportion to the amount of energy stored thereon during exposure to radiation; and photoelectrically detecting said light emitted from said stimulable phosphor sheet.
Claim 16
Dependent Claim
39 words
A method as defined in claim 13, wherein the steps of converting further comprising, prior to the steps of exposing and detecting, scanning said stimulable phosphor sheet to ascertain approximately the radiation image stored on said stimulable phosphor sheet.
Claim 17
Dependent Claim
17 words
A method as defined in claim 13, wherein said stimulating rays are produced by a laser medium.
Claim 18
Dependent Claim
15 words
A method as defined in claim 10, wherein said recording medium is a photographic film.
References Cited (Backward Citations)
US4258264A
Cited
US4315318A
Cited
US4276473A
Cited
JPS5611395A
Cited
US4387428A
Cited
US4527060A
Cited
US4516263A
Cited
US4682028A
Cited
US4983835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-02-16 | 1996-08-17 | 1997-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-02-16 | 2000-08-17 | 2001-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-02-16 | 2004-08-17 | 2005-02-16 | $7700.00 | Window Closed / Lapsed |