选择一个暗灰色，并开始画页的图标的轮廓。

Pick a dark gray color and start drawing the outline of the page icon.

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首先通过交互式分割选择出感兴趣区域(R OI)，提取出roi的轮廓点并根据位置关系对轮廓点排序。

First, the region of interest (ROI) is selected by interactive segmentation method. The boundary points of the ROI is extracted and ordered according to their positions.

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