Irradiation field recognizing method, and method of adjusting im

Details Irradiation field recognizing method, and method of adjusting im Irradiation field recognizing method, and method of adjusting im

1988-01-12

1989-08-22

Howell, Janice A.

Radiant energy

Automatic/serial detection of similar sources

2504841, G03C 516

Patent

active

048598500

ABSTRACT:
In a method of recognizing an irradiation field, sample image signals at a picture element string extending from an edge of a recording region towards the center thereof are extracted from image signals detected from a recording medium. Changes among image density levels represented by the sample image signals are expressed by an approximate equation, and differences between imaginary density levels calculated by the approximate equation and actual density levels are calculated to find an edge of the irradiation field. Or, intersections of lines represented by approximate equations for picture element groups and a density change curve in a range higher than a predetermined density and represented by the sample image signals are detected, and the intersection nearest to the edge of the recording region is recognized as the edge of the irradiation field. Image processing conditions are adjusted based on the image signals inside of the recognized irradiation field.

REFERENCES:
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patent: 4258264 (1981-03-01), Kotera et al.
patent: 4276473 (1981-06-01), Kato et al.
patent: 4527060 (1985-07-01), Suzuki et al.
patent: 4682028 (1987-07-01), Tanaka et al.

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