Three roughly defined corner edges are then acquired that define an approximately equilateral triangle pointed at the center of the image.

随后将获得三条粗略定义的角边，用于定义指向图像中心的近似的等边三角形。

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Three roughly defined corner edges are then acquired that define an approximately equilateral triangle pointed at the center of the image.

随后将获得三条粗略定义的角边，用于定义指向图像中心的近似的等边三角形。

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