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以遥感影像不可见数字水印算法为研究对象,介绍了当前主要空间域和频率域数字水印算法原理,包括以最低位算法和Patchwork算法为代表的空间域算法,以离散傅里叶变换算法、离散余弦变换算法和离散小波变换算法为代表的频率域算法,通过遥感影像数字水印嵌入和检测实验,对数字水印算法进行了主观分析、客观分析和抗攻击性评价。实验结果表明,频率域数字水印算法表现整体优于空间域数字水印算法,频率域算法中离散余弦变换算法和离散小波变换算法的表现较好,更适用于遥感影像数字水印算法的应用。
Taking the invisible digital watermarking algorithm of remote sensing image as the research object, the current principle of digital watermarking algorithm in both spatial and frequency domain is introduced, including the spatial domain algorithm represented by the least bit algorithm and the Patchwork algorithm, the discrete Fourier transform algorithm, discrete Cosine transform algorithm and discrete wavelet transform algorithm as the representative of the frequency domain algorithm, digital watermark embedding and detection experiments through remote sensing images, the subjective analysis of digital watermarking algorithms, objective analysis and evaluation of anti-aggression. The experimental results show that the performance of the digital watermarking algorithm in the frequency domain is better than that of the digital watermarking algorithm in the spatial domain. The discrete cosine transform algorithm and the discrete wavelet transform algorithm perform better in the frequency domain algorithm and are more suitable for the application of digital watermarking algorithms.