Experimental results of extracting feature points on different natural 2-d images proved that the threshold value determined was reasonable and effective.
通过对不同自然二维图像的特征点提取，证明了文中所确定的阈值是合理、有效的。
The sliding surface of rock or soil block usually appears three-dimensional feature, so, the 2-D limit equilibrium method is not good to analyze the block stability.
岩体与土体失稳的滑裂面形状大多具有三维特征，用二维极限平衡理论难以得到与实际相应的分析结果。
Deducing 3-d spatial image parameters according to 2-d section or the image parameters on projecting plane. the required feature informations are extracted and processed.
根据二维截面或投影面上的图象参数去推断三维的空间图象参数，提取需要的特征信息并自动地进行处理及输出特征参数值。
Deducing 3-d spatial image parameters according to 2-d section or the image parameters on projecting plane. the required feature informations are extracted and processed.
根据二维截面或投影面上的图象参数去推断三维的空间图象参数，提取需要的特征信息并自动地进行处理及输出特征参数值。
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