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.
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