For the laser scanning data of a building fa? Ade, which is featured with huge amount of data and complex point cloud, it is difficult to extract building's feature information.
对于建筑物立面的激光扫描数据来说，具有数据量大，点云复杂等特点，提取建筑物特征信息具有一定难度。
Terrain data is organized by grid, the article adopts height weighted average algorithm of elevation based on grid network, to extract feature point of TIN terrain.
采用网格索引来组织地形数据，利用反距离高程加权平均值算法，提取TIN地形的特征点。
In blind watermark detection process, we also extract the feature point from the normalized image, then extract the watermark.
在进行水印盲检测时，首先对含水印图象进行归一化处理并提取特征点，然后进行水印提取。
In blind watermark detection process, we also extract the feature point from the normalized image, then extract the watermark.
在进行水印盲检测时，首先对含水印图象进行归一化处理并提取特征点，然后进行水印提取。
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