Image analysis – Histogram processing – For setting a threshold
Patent
1989-09-29
1991-11-26
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
358453, 3644133, 382 6, 382 9, G06K 900
Patent
active
050689070
ABSTRACT:
After many image signal components representing a radiation image are obtained from a recording medium on which the radiation image has been recorded in the region inside of an irradiation field, contour points of the irradiation field are detected at the intersections of each radial line of a group of radial lines, which extend from a predetermined point inside of the irradiation field to edges of the recording medium, and the contour of the irradiation field. The contour point is detected on the basis of image signal components which correspond to picture elements arrayed along each line. In cases where a predetermined number of the contour points consecutively arrayed along the contour, which number is not smaller than three, are present on a single straight line, each of the extreme contour points on the single straight line is shifted to the intersection of the single straight line and a straight line, on which a contour point adjacent to each extreme contour point and not present on the single straight line, lies and which straight line intersects normal to the single straight line. The region surrounded by lines connecting the thus found contour points is detected as the irradiation field.
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Boudreau Leo H.
Fuji Photo Film Co. , Ltd.
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