| 摘要 |
<p>The segmented object is represented in terms of a numerical volume by calculating the gradients (17-20) of the physical quantities loaded into the volume elements of this numerical volume. The gradients are shown to be perpendicular to the true surface of the object to be segmented and that they determine a surface more precisely than a treatment carried out on the surface of the segmented object. To eliminate the artefacts of a contour line which are visible in particular in the regions of low relief, the gradients assigned to volume elements (6-9) of the surface of the object are weighted with respect to gradients assigned to volume elements (22-29) adjacent to these volume elements by apparent facets of this segmented object.</p> |
