针对光照条件不好的图像，提出了一种先旋转坐标轴，后双向重建的算法。

For the images of bad light conditions, propose an algorithm which first rotates coordinates and then bi-direction reconstruction.

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用双向链表实现了存储数据的功能。 使用了两个链表，分别存储编号对应的幻灯片的两个点对应的坐标，以及序号对应的点的坐标。

Using the two lists, slides are stored corresponding to the number corresponding to the coordinates of the two points, and the number of coordinates of the corresponding point.

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