| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technique for adjusting the contrast of an X-ray digital subtraction angiographic image to increase the visibility of the image. <P>SOLUTION: A feature value is extracted from a boundary region that is located between a contrast-agent injection region and a background region in a subtraction image, a gradation curve depending on the feature value is generated, and gradation processing is performed by applying the gradation curve to the subtraction image. <P>COPYRIGHT: (C)2011,JPO&INPIT |
