提出了一种向遥感图像中嵌入水印以保护其版权的算法.算法将数据融合技术和数字水印技术相结合,首先将全色图像进行小波分解,提取图像分解后的第三级低频边缘特征,利用PCA变换得到边缘特征的第一主分量作为水印信息,将水印与第三级中频进行融合;然后进行小波逆变换得到重构图像;最后采用小波变换和PCA融合法将含有水印的全色图像和多光谱图像相融合.提取水印时使用独立分量分析(ICA)方法.实验表明,该算法可以保护遥感图像的版权和进行真伪认证,且不破坏原始遥感图像的信息和特征,是有效可行的.%An algorithm that watermark is embedded to remote sensing images to protect their copyright was proposed. Algorithm combined data fusion technology with digital watermarking technology. First, panchromatic image was decomposed using wavelet and edge feature of the third approximation coefficient was extracted. PCA transform was done on the edge feature getting the first principal component as watermark,and then the watermark was embedded in detail coefficient. In the end, approximation coefficient and changed detail coefficients were constructed to obtain the image having watermark. Finally, panchromatic image that containes watermark was fused with multispectral image using the wavelet transform and PCA fusion method When extracting watermark,independent component analysis(ICA) method was used. The algorithm can protect the copyright of remote sensing images and certificate authenticity, also docs not destroy the original information and characteristics of remote sensing images. Experiment results show that the algorithm is feasible and effective.
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