| 摘要 |
PCT No. PCT/FR88/00177 Sec. 371 Date Oct. 17, 1989 Sec. 102(e) Date Oct. 17, 1989 PCT Filed Apr. 12, 1988 PCT Pub. No. WO88/08169 PCT Pub. Date Oct. 20, 1988.The segmented object is represented in terms of a numerical volume by calculating the gradients 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 of the surface of the object are weighted with respect to gradients assigned to volume elements adjacent to these volume elements by apparent facets of this segmented object.
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