That stands for the surfaceareaelement on this surface.
它表示曲面上的面积元素。
2
The least square method equalization filter is a kind of 2D filter; its filtering window is surfaceareaelement.
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。
3
The method comprises the following steps: after parallel rays project to a target surfaceareaelement, acquiring a path parameter of each ray from incidence to reflection;