The vessel skeleton was recursively tracked to generate the feature tree and the tree was traversed consequently to pick up the branch points and end points.

先通过预处理提取出血管并进行三维细化，再递归跟踪血管骨架生成特征树并进行遍历提取出血管的分支点和端点。

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Study of the Pick-up of Coordinates of Feature-points in an Image Captured in the Lightpen Vision Measurement;

提出了光笔式视觉坐标测量中被测特征点像面坐标的提取方法。

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