| 摘要 |
An image size reducing process is carried out on an original radiation image represented by an original image signal, and a reduced image signal representing a reduced image is thereby obtained. A process for recognizing the irradiation field is carried out on the reduced image signal representing the reduced image, which has been obtained from the reducing process, and a temporary irradiation field contour is thereby detected. An enlarging process is then carried out in order to enlarge the temporary irradiation field contour to a size corresponding to the size on the original radiation image, and an enlarged temporary irradiation field contour is thereby obtained. A degree of conformity of the enlarged temporary irradiation field contour to the original radiation image is evaluated by use of a predetermined evaluation function. An irradiation field contour, which has the highest degree of conformity, is determined in accordance with the results of the evaluation.
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