Usually one can use the orthographic model for distant shot, and the perspective model for close shot.

拍摄远景图像可用正投影模型来近似，而近景图像可以用常用的透视投影模型来近似。

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The experimental result shows that the perspective model is quite suitable for the 3-d surface measurement, comparing with the orthographic projection model.

实验结果表明，与正交投影模型相比，透视投影模型的三维表面测量效果显著提高。

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The experimental result shows that the perspective model is quite suitable for the 3-d surface measurement, comparing with the orthographic projection model.

实验结果表明，与正交投影模型相比，透视投影模型的三维表面测量效果显著提高。

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