Method of judging the presence or absence of a limited irradiati

Details Method of judging the presence or absence of a limited irradiati Method of judging the presence or absence of a limited irradiati

1988-08-22

1990-08-28

Hannaher, Constantine

Radiant energy

Automatic/serial detection of similar sources

2504841, G21K 400, G03B 4200

Patent

active

049528050

ABSTRACT:
A method of judging the presence or absence of a limited irradiation field on a recording medium in the case where a radiation image has been recorded on the recording medium comprises the steps of creating a histogram of image signals detected from the recording medium, and dividing the histogram into small regions by an automatic threshold value selecting process using a discriminant criterion or a standard equivalent to the discriminant criterion. The small region located on the lowest signal level side is divided into a lower level division and a higher level division with respect to a mean image signal level of the small region. The limited irradiation field is judged to be present in the case where spread of the lower level division is wider than spread of the higher level division, and judged to be absent in the case where the spread of the lower level division is narrower than the spread of the higher level division.

REFERENCES:
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patent: 4620097 (1986-10-01), Tanaka et al.
patent: 4638162 (1987-01-01), Tanaka et al.
patent: 4682028 (1987-07-01), Tanaka et al.
patent: 4851678 (1989-07-01), Adachi et al.
Denshi Tsushin Gakkai Ronbun Sehi (Collected Papers on the Institute of Electronics and Communications Engineers of Japan), '80/4, vol. J63-D, No. 4, pp. 349-356 and '86/9, vol J66-D, No. 9, pp. 1355-1356.

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