| 摘要 |
PURPOSE:To determine optimum readout condition by checking correlations between differential values in a differential image or values obtained by processing the differential values and values on respective templetes, and determining the readout condition of a primary read on the basis of preread image information inside the irradiation field contour corresponding part on the templete having the largest correlation. CONSTITUTION:Digital image data at respective positions are differentiated to find a differential value delta at each position on a memory type fluorescent material sheet, forming the differential image. Correlation between the differential image and numbers of prepared many-valued image templetes are calculated and the results are compared to detect an irradiation field. Namely, the differential values on the differential image are multiplied by values on the prepared templetes for the same positions to calculate the sum of the products and the area inside the irradiation field contour corresponding part of the templete having the maximum total sum of the products is recognized as the irradiation field. Thus, the irradiation field is decided and then the readout condition of the primary read is determined on the basis of only the image information in the irradiation field among pieces of preread image information.
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