Method for judging the presence or absence of limited irradiatio

Details Method for judging the presence or absence of limited irradiatio Method for judging the presence or absence of limited irradiatio

1990-07-25

1992-02-25

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

2503272, G06K 900

Patent

active

050919709

ABSTRACT:
A method for judging the presence or absence of a limited irradiation field comprises the steps of obtaining an image signal by reading out a radiation image of an object from a recording medium on which the radiaton image has been recorded, and calculating first and second representative values on the basis of the image signal. The first representative value is representative of the values of the image signal corresponding to the overall peripheral portion of the recording medium or corresponding to part of the peripheral portion. The second representative value is representative of the values of the image signal corresponding to the overall area of the recording medium or corresponding to approximately the center portion of the recording medium. The first representative value and the second representative value are compared with each other, and the presence or absence of a limited irradiation field is judged on the basis of the results of the comparison.

REFERENCES:
patent: 4315318 (1982-02-01), Kato et al.
patent: 4317179 (1982-02-01), Kato et al.
patent: 4765744 (1988-08-01), Kobayashi
patent: 4818876 (1989-04-01), Agano et al.
patent: 4827526 (1989-05-01), Matsumoto
patent: 4931644 (1990-06-01), Adachi et al.
patent: 4952805 (1990-08-01), Tanaka

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