| 摘要 |
<p>PURPOSE:To perform proper space frequency processing, facilitate parameter adjustment, and reduce the calculation quantity by performing specific space frequency processing with the gradation mask data obtained by averaging many picture element data corresponding to many picture elements in the prescribed area surrounding a prescribed picture element on an image. CONSTITUTION:The space frequency processing having the characteristic that the contrast level ¦Q-S¦ is monotonously increased in a polygonal line then monotonously decreased as ¦S-Sm¦ is increased while the prescribed picture element is changed in sequence, where Sm is the gradation mask data obtained by averaging many picture element data corresponding to many picture elements in the prescribed area surrounding the prescribed picture element based on the picture element data indicating the radiation transmission quantity, S is the picture element data corresponding to the prescribed picture element, and Q is the processed data. The space frequency processing indicated by a straight line except for the area where no space frequency processing is made is typically performed, and the optimum value is easily obtained.</p> |
