基于几何校正的双树复小波域彩色图像水印算法
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摘要
为了使图像水印算法拥有更好的鲁棒性和不可感知性,以双树复小波变换(DTCWT)为基础,提出了一种新的彩色图像盲水印算法。本算法将彩色图像颜色空间由RGB转换到YIQ,选取亮度分量Y进行双树复小波变换,得到低频子带,然后将加密后的水印信息嵌入到低频子带中。在水印提取过程中,使用了新颖的基于四元数PHT的最小二乘支持向量(LS-SVM)几何校正方法。实验结果表明,本算法具有更好的鲁棒性和不可感知性。
To make the image watermarking scheme has higher robustness and better invisibility, this paper proposes a new color image blind watermarking algorithm on the basis of dual tree complex wavelet transform(DTCWT). This algorithm converts image color space from RGB to YIQ. Dual tree complex wavelet transform is used with the luminance component Y for getting the low frequency subband. Then it embeds the encrypted watermarks to the low frequency subband. In the process of watermarks extraction, a novel geometric correction with least squares support vector machine(LS-SVM) using quaternion PHT moment is exploited. Experimental results confirm that the algorithm has better robustness and invisibility.
To make the image watermarking scheme has higher robustness and better invisibility, this paper proposes a new color image blind watermarking algorithm on the basis of dual tree complex wavelet transform(DTCWT). This algorithm converts image color space from RGB to YIQ. Dual tree complex wavelet transform is used with the luminance component Y for getting the low frequency subband. Then it embeds the encrypted watermarks to the low frequency subband. In the process of watermarks extraction, a novel geometric correction with least squares support vector machine(LS-SVM) using quaternion PHT moment is exploited. Experimental results confirm that the algorithm has better robustness and invisibility.
引文
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[7]AL-OTUM H M,SAMARA N A.A robust blind color image watermarking based on wavelet-tree bit host difference selection[J].Signal Process,2010,90(8):2498-2512.
[8]TSUI T K,ZHANG X P,ANDROUTSOS D.Color image watermarking using multidimensional Fourier transforms[J].IEEE Trans Inform Forensics Secur,2008,3(1):16-28.
[9]CHEN B J,SHU H Z,ZHANG H,et al.Quaternion Zernike moments and their invariants for color image analysis and object recognition[J].Signal Processing,2012,92(2):308-318.
[10]GUO L Q,ZHU M.Quaternion Fourier-Mellin moments for color images[J].Pattern Recognition,2011,44(2):187-195.
[11]YAP P T,JIANG X D,KOT A C.Two-dimensional polar harmonic transforms for invariant image representation[J].IEEE Trans on Pattern Analysis and Machine Intelligence,2010,32(7):1259-1270.
[12]徐紫涵,王向阳.可有效抵抗一般性几何攻击的数字水印检测方法[J].自动化学报,2009,35(1):23-27.
[13]FU Y G,SHEN R M.Color image watermarking schemo based on linear discriminant analysis[J].Computer Standards&Interfaces,2008,30(3):115-120.
[2]ZHANG H,SHU H,COATRIEUX G.Affine Legendre moment invariants for image watermarking robust to geometric distortions[J].IEEE Trans Image Process,2011,20(8):2189-2199.
[3]OGUZ F,ISMAIL B,譈LKER E.A color image watermarking scheme based on artificial immune recognition system[J].Expert Syst Appl,2011,38(3):1942-1946.
[4]TSAI H H,SUN D W.Color image watermark extraction based on support vector machines[J].Information Sciences,2007,177(2):550-569.
[5]NIU P P,WANG X Y,YANG Y P,et al.A novel color image watermarking scheme in nonsampled contourlet-domain[J].Expert Systems With Applications,2011,38(3):2081-2098.
[6]GUNJAL B L,MALI S N.Strongly robust and highly secured DWT-SVD based color image watermarking:embedding data in all Y,U.V color spaces[J].Int J Inform Technol Comput Science,2012,4(3):1-7.
[7]AL-OTUM H M,SAMARA N A.A robust blind color image watermarking based on wavelet-tree bit host difference selection[J].Signal Process,2010,90(8):2498-2512.
[8]TSUI T K,ZHANG X P,ANDROUTSOS D.Color image watermarking using multidimensional Fourier transforms[J].IEEE Trans Inform Forensics Secur,2008,3(1):16-28.
[9]CHEN B J,SHU H Z,ZHANG H,et al.Quaternion Zernike moments and their invariants for color image analysis and object recognition[J].Signal Processing,2012,92(2):308-318.
[10]GUO L Q,ZHU M.Quaternion Fourier-Mellin moments for color images[J].Pattern Recognition,2011,44(2):187-195.
[11]YAP P T,JIANG X D,KOT A C.Two-dimensional polar harmonic transforms for invariant image representation[J].IEEE Trans on Pattern Analysis and Machine Intelligence,2010,32(7):1259-1270.
[12]徐紫涵,王向阳.可有效抵抗一般性几何攻击的数字水印检测方法[J].自动化学报,2009,35(1):23-27.
[13]FU Y G,SHEN R M.Color image watermarking schemo based on linear discriminant analysis[J].Computer Standards&Interfaces,2008,30(3):115-120.