其光线投射算法从屏幕上的每个像素点出发，沿设定视点方向，发出一条射线，沿该射线选择若干个等距采样点。
Ray casting were stared out at every pixel on screen along viewpoint direction, and then some sample points were selected on the line.
本文根据芦苇在不同湿地生境的分布，合理选择采样点，做实验室模拟实验。
The thesis chooses the reasonable sampling site according to the different distribution of Phragmite australis, and combing the simulation experiment.
然后对人脸不同局部位置处采样点的分类能力进行评价，选择分类能力最强的位置提取特征点。
Then, the classification abilities of different local positions in the face were evaluated, and feature points were chosen at the positions with the strongest discriminating power.
计算机随机选择采样点，采样点车车不同，保证了样品的代表性、公正。
The random sample selection and different sample positions ensure the samples to be representative and fair.
应用污染几率原则，选择在沿岸地区最大污染几率的上风方位设立大气采样点。
Based on the principle of the pollution probability, the atmospheric sampling station was set up on the coastal area of upstream wind side where the pollution probability is the highest.
同时提出一种自适应特征点采样选取算法，对采样块的大小及分布进行选择，避免了计算的冗余性。
Simultaneously, this paper introduces an adaptive sampling algorithm which can compute the size and distribution of sample areas usefully to reduce the redundancy of computation.
同时提出一种自适应特征点采样选取算法，对采样块的大小及分布进行选择，避免了计算的冗余性。
Simultaneously, this paper introduces an adaptive sampling algorithm which can compute the size and distribution of sample areas usefully to reduce the redundancy of computation.
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