该方法在一定的量化标准下利用小渡变换提取图象的特征信息，通过混沌序列对其加密生成数字水印。
In this method, the original image 's feature is extracted by using wavelet transform and quantization. The feature information is changed into watermark by the chaotic sequence encryption.
首先，利用二进小波变换检测建筑物边缘，然后通过计算基于小渡的仿射不变量识别建筑物，最后构建了建筑物轮廓模式数据库。
Firstly, dyadic wavelet was used to extract the edge, and then buildings were recognized by computing the affine invariants, In addition, a building recognition pattern database was constructed.
糯扎渡水电站大坝所处地段的河谷系数小，施工条件差，上坝道路布置困难。
The dam for the Nuozhadu Hydropower Station is located in an area with small valley coefficient, poor construction conditions and difficult arrangement of access roads to dam crest.
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