Image analysis – Applications – Biomedical applications
Patent
1993-02-04
1998-06-09
Chin, Wellington
Image analysis
Applications
Biomedical applications
250586, G06K 900
Patent
active
057647917
ABSTRACT:
An image signal is obtained from a recording medium, on which a radiation image has been recorded with an irradiation field being limited. A prospective contour point of the irradiation field is detected from signal components corresponding to positions on the recording medium located along each of lines radiating from a predetermined point in the region inside of the irradiation field towards edges of the recording medium. Differentiation processing is carried out on the signal components corresponding to positions on the recording medium located along each radial line in order to obtain differentiated values. If both the differentiated values, which are respectively negative and positive and the absolute values of which are larger than a predetermined value, occur while the differentiation processing proceeds from a signal component corresponding to the predetermined point in the region inside of the irradiation field towards a signal component corresponding to each edge of the recording medium, the region extending between the points on the recording medium associated with the two differentiated values is removed from the region surrounded by lines connecting the prospective contour points, and the resulting region is detected as the irradiation field.
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English Language abstract of Japanese Patent Publication No. 61-5193.
English Language Translation of Japanese Unexamined Patent Publication No. 56-11395.
Chin Wellington
Corrielus Jean B.
Fuji Photo Film Co. , Ltd.
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