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如何从图像中获取一张纸（或其他矩形物体）的宽度和高度比？这是一个示例/图像，可能会使我的问题更清楚， http: //imgur.com/Hcu0CNi。我知道图像中纸张角的坐标。我猜不可能得到纸张真实的宽高比，但是应该可以得到纸张的宽高比吧？