Irradiation field extracting method and apparatus and recording medium
AssigneeCanon Kabushiki Kaisha
InventorTomohiko Matsuura
Life of this patent
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Abstract
It is an object to enable an irradiation field to be accurately extracted. An irradiation field extracting method of extracting an irradiation field from a radiation image is constructed by a step of extracting characteristic points in the radiation image by using geometric patterns for detecting an irradiation field edge and a step of detecting an edge portion of the irradiation field on the basis of the characteristic points.
Claims17
An irradiation field extracting method of extracting an irradiation field from a radiation image, comprising the steps of:
- extracting a characteristic point in the radiation image by using a geometric pattern for detecting an irradiation field edge;
- and
- detecting an edge portion of said irradiation field on the basis of said characteristic points.
An irradiation field extracting apparatus comprising:
- geometric pattern extracting means for extracting a geometric pattern in a radiation image;
- and
- irradiation field discriminating means for determining an irradiation field on the basis of the geometric pattern extracted by said geometric pattern extracting means.
A recording medium which records a computer-readable program, wherein
- said program is used for executing an irradiation field extracting method of extracting an irradiation field from a radiation image, and
- said program comprises the steps of:
- extracting a characteristic point in said radiation image by using a geometric pattern for detecting an irradiation field edge;
- and
- detecting an edge portion of said irradiation field on the basis of said characteristic point.
An irradiation field extracting method of extracting an irradiation field from a radiation image, comprising the steps of:
- holding a plurality of geometric patterns for detecting an irradiation field edge;
- comparing a target pixel and peripheral pixel of said target pixel with said plurality of geometric patterns, thereby detecting pixel, as a characteristic point, having a possibility of being an edge portion of said irradiation field in said radiation image, and calculating a score indicative of the possibility that said characteristic point is the edge portion of said irradiation field;
- and
- obtaining a line showing the edge portion of said irradiation field from position and score of said detected characteristic point.
A program for executing an irradiation field extracting method of extracting an irradiation field from a radiation image, comprising the steps of:
- holding a plurality of geometric patterns for detecting an irradiation field edge;
- comparing a target pixel and peripheral pixel of said target pixel with said plurality of geometric patterns, thereby detecting pixels, as characteristic points, having a possibility of being an edge portion of said irradiation field in said radiation image, and calculating a score indicative of the possibility that said characteristic point is the edge portion of said irradiation field;
- and
- obtaining a line showing the edge portion of said irradiation field from position and score of said detected characteristic point.
Dependencies are inferred from the claim text.