US5732149A
Expired / Lapsed
US
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Apparatus for extracting an irradiation field region from a radiation image
Assignee: Konica Minolta Inc
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Filing: 1997-05-09
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Granted: 1998-03-24
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Expires: 2017-05-09
Abstract
Abstract An irradiation field region extracting apparatus for extracting an irradiation field region from a given radiation image. According to a first embodiment, image data corresponding to the radiation image is rotationally moved around a predetermined rotational center of the image data, with the image data having rectangular coordinates set thereon. A boundary line is extracted between the irradiation field region, where the radiation image is exposed, and an irradiation field stop region, where no radiation image is exposed, according to the image data rotationally moved by the rotational movement means. A parallel condition of the boundary line is detected wherein the boundary line is parallel to an axis of the image data, and rotation information data is generated which indicate an angle of a rotational movement of the boundary line from an original location to a location of the parallel condition and a distance between the predetermined rotational center and a given point on the boundary line. A linear equation of the boundary line, originally located before the rotational movement, is calculated in accordance with the rotation information data, and a region, which is surrounded by a plurality of boundary lines calculated in accordance with the linear equation, is extracted as the irradiation field region.
Inventors
- 👤 Atsushi Kido
- 👤 Hitoshi Yoshimura
- 👤 Hisashi Yonekawa
- 👤 Akiko Yanagita
- 👤 Sumiya Nagatsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:22
CPC Classifications
G; G06; G06T; G06T7/00; G06T7/0002; G06T7/0012; G06T7/10; G06T7/12; G06T7/194; G06T2207/00; G06T2207/10; G06T2207/10116; G06T2207/30; G06T2207/30004; G06T2207/30068
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
230 words
An irradiation field region extracting apparatus for extracting an irradiation field region from a radiation image, comprising: a rotational movement means for rotationally moving image data corresponding to said radiation image around a predetermined rotational center of said image data, said image data having rectangular coordinates set thereon; a boundary line extracting means for extracting a boundary line between said irradiation field region, where said radiation image is exposed, and an irradiation field stop region, where no radiation image is exposed, according to said image data rotationally moved by said rotational movement means; a parallel condition detecting means for detecting a parallel condition of said boundary line, extracted by said boundary line extracting means, wherein said boundary line is parallel to an axis of said image data, and for generating rotation information data which indicate an angle of a rotational movement of said boundary line from an original location to a location of said parallel condition and a distance between said predetermined rotational center and a given point on said boundary line; a linear equation calculating means for calculating a linear equation of said boundary line, originally located before the rotational movement, in accordance with said rotation information data; and an irradiation region extracting means for extracting a region, which is surrounded by a plurality of boundary lines calculated in accordance with said linear equation, as said irradiation field region.
Claim 2
Dependent Claim
230 words
An irradiation field region extracting apparatus for extracting an irradiation field region from a radiation image, comprising: a rotational movement means for rotationally moving image data corresponding to said radiation image around a predetermined rotational center of said image data, said image data having rectangular coordinates set thereon; a boundary line extracting means for extracting a boundary line between said irradiation field region, where said radiation image is exposed, and an irradiation field stop region, where no radiation image is exposed, according to said image data rotationally moved by said rotational movement means; a parallel condition detecting means for detecting a parallel condition of said boundary line, extracted by said boundary line extracting means, wherein said boundary line is parallel to an axis of said image data, and for generating rotation information data which indicate an angle of a rotational movement of said boundary line from an original location to a location of said parallel condition and a distance between said predetermined rotational center and a given point on said boundary line; a linear equation calculating means for calculating a linear equation of said boundary line, originally located before the rotational movement, in accordance with said rotation information data; and an irradiation region extracting means for extracting a region, which is surrounded by a plurality of boundary lines calculated in accordance with said linear equation, as said irradiation field region.
Claim 3
Dependent Claim
230 words
An irradiation field region extracting apparatus for extracting an irradiation field region from a radiation image, comprising: (i) a boundary point extracting means for extracting a plurality of continuous boundary points on a boundary line between said irradiation field region, where said radiation image is exposed, and an irradiation field stop region, where no radiation image is exposed, said boundary point extracting means comprising: a small region dividing means for dividing said radiation image into a plurality of small regions; and a characteristic value calculating means for calculating a characteristic value of each of said plurality of small regions; wherein said characteristic value includes at least one of a dispersion value, a standard deviation value, and a difference between a maximum value and a minimum value calculated from pixel data of each of said plurality of small regions; and wherein said boundary point extracting means extracts said plurality of continuous boundary points by successively judging whether or not each of ones of said plurality of small regions peripheral to a target small region comprises a part of said boundary line according to said characteristic value respectively corresponding to each of said ones of said plurality of small regions peripheral to said target small region; and (ii) an irradiated region extracting means for extracting a region which is surrounded by said plurality of continuous boundary points as said irradiation field region.
Claim 4
Dependent Claim
230 words
An irradiation field region extracting apparatus for extracting an irradiation field region from a radiation image, comprising: (i) a boundary point extracting means for extracting a plurality of continuous boundary points on a boundary line between said irradiation field region, where said radiation image is exposed, and an irradiation field stop region, where no radiation image is exposed, said boundary point extracting means comprising: a small region dividing means for dividing said radiation image into a plurality of small regions; and a characteristic value calculating means for calculating a characteristic value of each of said plurality of small regions; wherein said characteristic value includes at least one of a dispersion value, a standard deviation value, and a difference between a maximum value and a minimum value calculated from pixel data of each of said plurality of small regions; and wherein said boundary point extracting means extracts said plurality of continuous boundary points by successively judging whether or not each of ones of said plurality of small regions peripheral to a target small region comprises a part of said boundary line according to said characteristic value respectively corresponding to each of said ones of said plurality of small regions peripheral to said target small region; and (ii) an irradiated region extracting means for extracting a region which is surrounded by said plurality of continuous boundary points as said irradiation field region.
Claim 5
Dependent Claim
231 words
An irradiation field region extracting apparatus for extracting an irradiation field region from a radiation image, comprising: a photographic information input means for inputting photographic information with respect to said radiation image when said radiation image is obtained, said photographic information including at least object characteristic information and photographing environmental conditions; a plurality of irradiation field region extracting means each for extracting said irradiation field region from said radiation image according to a respective predetermined irradiation field region extraction process; and an irradiation field region extraction processing selecting means for selecting one of said plurality of irradiation field region extracting means to extract said irradiation field region from said radiation image according to said photographic information inputted by said photographic information input means, wherein said plurality of irradiation field region extracting means includes at least one of: an irradiation field region extracting means having a rotational movement means for rotationally moving image data corresponding to said radiation image around a predetermined rotational center of said image data, said image data having rectangular coordinates; and an irradiation field region extracting means having a boundary point extracting means for extracting a plurality of continuous boundary points by successively judging whether or not each of a plurality of small regions peripheral to a target small region comprises a part of a boundary line between said irradiation field region and an irradiation field stop region.
Claim 6
Dependent Claim
231 words
An irradiation field region extracting apparatus for extracting an irradiation field region from a radiation image, comprising: a photographic information input means for inputting photographic information with respect to said radiation image when said radiation image is obtained, said photographic information including at least object characteristic information and photographing environmental conditions; a plurality of irradiation field region extracting means each for extracting said irradiation field region from said radiation image according to a respective predetermined irradiation field region extraction process; and an irradiation field region extraction processing selecting means for selecting one of said plurality of irradiation field region extracting means to extract said irradiation field region from said radiation image according to said photographic information inputted by said photographic information input means, wherein said plurality of irradiation field region extracting means includes at least one of: an irradiation field region extracting means having a rotational movement means for rotationally moving image data corresponding to said radiation image around a predetermined rotational center of said image data, said image data having rectangular coordinates; and an irradiation field region extracting means having a boundary point extracting means for extracting a plurality of continuous boundary points by successively judging whether or not each of a plurality of small regions peripheral to a target small region comprises a part of a boundary line between said irradiation field region and an irradiation field stop region.
Claim 7
Dependent Claim
46 words
The irradiation field region extracting apparatus of claim 3, further comprising: a threshold value adjusting means for adjusting a threshold value corresponding to said one of said plurality of irradiation field region extracting means which is selected by said irradiation field region extraction processing selecting means.
Claim 8
Dependent Claim
57 words
The irradiation field region extracting apparatus of claim 3, wherein: said object characteristic information includes at least one of a photographed portion information, a photographed posture information and photographic object information; and said photographing environmental conditions includes at least one of a photographing method, a photographing condition, configurational characteristics of object, positional characteristics, and image constitution characteristics.
References Cited (Backward Citations)
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