基于复小波域奇异值分解的自适应图像水印

将双树复小波分解的多方向性扣冗余性与奇异值稳定性结合,提出一种新的盲检测数字水印方案.该方案将水印嵌入图像双树复小波分解后各子带系数的分块奇异值中,块长可动态调整.为避免产生块状效应.使用统计学模型来自适应调整量化参数,改善了水印图像的不可感知性和安全性.实验表明,该方案对于通常的几何攻击具有鲁棒性,对JPEG压缩攻击性能较稳定,并有效提高了水印的容量.

Self-adaptive digital image watermarking based on dual-tree complex wavelet transform and singular value decomposition

Combining the multi-direction and redundancy of decomposition of Dual-Tree Complex Wavelet Transform(DTCWT) and the stability of the singular value,a new digital blind watermarking was put forward.It embeded watermarking into the singular value of sub-blocks after the decomposition of image DTCWT.The block length parameter could be adjusted dynamically.To avoid a blocky effect,statistical models were utilized to self-adaptively adjust the quantization parameter,which improved the imperceptibleness and secur...