基于内容的离散余弦变换域自适应遥感图像数字水印算法

Content-based Adaptive Discrete Cosine Transform Domain Watermarking Algorithm for Remote Sensing Image

提出一种适于遥感图像知识产权保护和机密信息传递的离散余弦变换域自适应数字水印嵌入算法,该算法能够通过数字水印置乱、嵌入位置自适应选取、嵌入深度智能调节等措施,将二值水印图像信息安全地嵌入到遥感图像(纹理区)的离散余弦变换域中高频系数内。实验结果表明:该遥感图像数字水印算法不仅具有较好的透明性,而且对诸如叠加噪声J、PEG压缩、平滑滤波、几何剪切、图像增强、马赛克等攻击均具有较好的抗差性,整体性能优于Ho等提出的数字水印嵌入方案。

A novel adaptive discrete cosine transform-domain watermarking algorithm is presented for copyrighting of remote sensing images. The proposed method can utilize the human visual system （HVS） to embed a digital watermark in discrete cosine transform middle-high frequency coefficients of host image by scrambling the watermark image, determining adaptively the location where the watermark can be hidden, and modifying intelligently the strength of the embedded watermark. Experimental results show that the novel watermarking scheme for remote sensing image has great imperceptibility and is robust to the image intensity attack such as cropping, high compression, filtering, noise adding, image enhancement, and mosaic. It performs better than that of the watermarking algorithm proposed by Ho in the aspects of imperceptibility and robustness.