Method of recognizing irradiation field

Details Method of recognizing irradiation field Method of recognizing irradiation field

1988-04-18

1990-10-30

Howell, Janice A.

Radiant energy

Automatic/serial detection of similar sources

2504841, H04N 532

Patent

active

049670794

ABSTRACT:
A stimulable phosphor sheet bearing radiation image information recorded thereon by limitation of the irradiation field is exposed to stimulating rays and light emitted by the stimulable phosphor sheet upon stimulation is photoelectrically read out to obtain image signals representing the radiation image information borne by the stimulable phosphor sheet. The irradiation field is recognized by obtaining digital image data for a plurality of positions on the stimulable phorphor sheet from the image signals, detecting prospective edge points, which are considered to be edge portions of the irradiation field on the stimulable phosphor sheet, on the basis of the image data of positions radially outwardly arranged in a plurality of directions from a predetermined point inside the irradiation field, and recognizing as the irradiation field the region surrounded by the lines passing through the prospective edge points.

REFERENCES:
patent: 4685143 (1987-08-01), Choate
Pratt, W., Digital Images Processing, p. 523, J. Wiley (1978).

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