基于傅里叶变换域全息数字水印算法研究

通过模拟傅里叶变换加密全息水印的生成对水印信息进行了预处理,并通过模拟加密全息水印的重建水印算法对水印信息进行了重建,保证了水印的安全性。在DCT 和DWT 相结合的变换域中,嵌入水印及在均匀颜色空间CIELab 的亮度分量L 中嵌入水印,使水印的不可见性较好,该算法利用全息加密对裁切攻击有较好的鲁棒性,且属于盲提取水印技术。实验结果表明,嵌入水印的图像能够满足人眼视觉的要求,同时也满足客观评价标准,而且重建的水印图像较清晰,能够精确判断图像的真伪。

Holographic Digital Watermarking Algorithm Based on Fourier Transform Domain

Security of watermark was ensured by preprocessing watermark information through simulating the generation of Fourier transform holographic watermark encryption and by reconstruction of encrypted holographic watermark. The watermark was embedded based on transform domain in the DCT-DWT and the luminance component L of the uniform color space CIELab, which can improve the invisibility of the watermark; the algorithm using encrypted holographic has strong robust against cut attack, and belongs to the blind extraction of watermark technology. The experimental results showed that the embedded watermark image can meet the visual requirements, and also meet the objective evaluation criteria; the reconstructed watermark image is clear and the authenticity of images can be judged accurately.