That stands for the surface area element on this surface.
它表示曲面上的面积元素。
The least square method equalization filter is a kind of 2D filter; its filtering window is surface area element.
最小二乘法均衡滤波器是二维滤波器，其滤波窗口是一个面积单元。
The method comprises the following steps: after parallel rays project to a target surface area element, acquiring a path parameter of each ray from incidence to reflection;
所述方法包括：当平行射线投向目标面元后，获取每条射线从入 射到反射的路径参数；
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