对比传统方法的肺血管分割结果，它能更准确地分割出肺ct图像中的血管。
And compared to traditional pulmonary vascular segmentation method, it has more accurate segmentation ability of the pulmonary vascular in CT images.
本文主要研究数字减影血管造影三维重建过程中的血管分割、中轴提取以及血管的三维表达问题。
In this paper we mostly research vessel segmentation, vessel centerline extraction and the three dimensional representation of vessels in the three dimensional reconstruction.
因为视网膜图像中血管和背景在局部范围内都比较均匀，所以在每个子图像中都存在一个局部阈值能够将其中的血管分割出来。
Because both vessels and background are locally uniform in retinal images, there must be a threshold which is able to segment vessels precisely in a certain sub-image.
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