基于DWT-DCT-SVD的彩色图像零水印算法
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摘要
针对数字水印算法中由于对原始图像数据进行修改而导致水印不可见性和鲁棒性之间出现的矛盾,提出一种基于DWT-DCT-SVD的彩色图像零水印算法.将宿主彩色图像从RGB颜色空间转换到YCbCr颜色空间,然后对亮度分量(Y)进行一层离散小波变换(DWT),取其低频子带进行分块离散余弦变换(DCT),并且对每个分块进行奇异值分解,使分解得到的奇异值作为图像的特征来构造零水印;利用图像的奇异值具有较强的稳定性,对几何失真具有不变性,结合零水印的思想,可以有效地解决水印不可见性和鲁棒性之间的矛盾;水印提取不需要原始图像参与,具有盲检测性.实验结果表明,该算法对常见信号处理,如剪切、中值滤波、椒盐噪声、JPEG压缩等具有较强的鲁棒性.
Aiming at the conflicts between invisibility and robustness for the digital watermarking algorithm by modified the data of the original image,a zero-watermark algorithm is proposed for color image based on DWT,DCT and SVD.First,the method is to switched the host image from RGB color space to YCbCr space.Then,by using a layer of discrete wavelet transforms to the luminance Y of the color image,and divided the low frequency band into blocks by using discrete cosine transform,and conducted SVD with every block to generated the zerowatermark by the decomposition of the singular values as the characteristics of the image.Finally,the conflicts between invisibility and robustness of the watermarking is better solved to combined with the idea of zero-watermark by the strong stability of singular values about image to resist geometric distortion.And the process of extracted the embedded watermark without the original image to achieved a blind detection.Experiments show that the proposed algorithm has strong robustness to against familiar signal processing method,such as cuting,median filtering,salt and pepper noise and JPEG compression.
Aiming at the conflicts between invisibility and robustness for the digital watermarking algorithm by modified the data of the original image,a zero-watermark algorithm is proposed for color image based on DWT,DCT and SVD.First,the method is to switched the host image from RGB color space to YCbCr space.Then,by using a layer of discrete wavelet transforms to the luminance Y of the color image,and divided the low frequency band into blocks by using discrete cosine transform,and conducted SVD with every block to generated the zerowatermark by the decomposition of the singular values as the characteristics of the image.Finally,the conflicts between invisibility and robustness of the watermarking is better solved to combined with the idea of zero-watermark by the strong stability of singular values about image to resist geometric distortion.And the process of extracted the embedded watermark without the original image to achieved a blind detection.Experiments show that the proposed algorithm has strong robustness to against familiar signal processing method,such as cuting,median filtering,salt and pepper noise and JPEG compression.
引文
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[9]黄良永,肖德贵.二值图像Arnold变换的最佳置乱度[J].计算机应用,2009,29(2):474-477.
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[13]ANKITA D,ALKA J.Increase security of image from attacks using digital watermarking with SVD technique[J].International Journal of Advanced Research in Computer Engineering and Technology,2012,1(7):64-69.
[14]王磊.基于SVD变换的数字水印算法研究[D].合肥:合肥工业大学,2009.
[15]叶天语.DWT-SVD域全盲自嵌入鲁棒量化水印算法[J].中国图象图形学报,2012,17(6):644-650.
[2]胡裕峰.图像变换域数字水印技术研究[D].杭州:浙江大学,2014.
[3]张德发,胡维华.数字水印算法的鲁棒性和不可见性研究[J].计算机仿真,2012,29(7):274-277.
[4]尚南南.图像零水印算法的研究[D].杭州:杭州电子科技大学,2013.
[5]温泉,孙锬锋,王树勋.零水印的概念与应用[J].电子学报,2003,31(2):214-216.
[6]刘瑞桢,谭铁牛.基于奇异值分解的数字图像水印方法[J].电子学报,2001,29(2):168-171.
[7]李学斌,俞登峰,程亮.基于奇异值分解的零水印算法[J].计算机工程,2009,32(11):163-165.
[8]潘黄琼,陈光喜,丁勇,等.彩色图像DWT变换下的块SVD零水印[J].微电子学与计算机,2012,29(5):50-53.
[9]黄良永,肖德贵.二值图像Arnold变换的最佳置乱度[J].计算机应用,2009,29(2):474-477.
[10]SHANG Y F,KANG Y N.Medical Images Watermarking Algorithm Based on Improved DCT[J].Journal of Multimedia,2013,8(6):796-801.
[11]CHIRAG S,DEEPAK P.DWT Based robust technique of watermarking applied on digital images[J].International Journal of Soft Computing and Engineering,2012,2(2):399-402.
[12]CHENG M Z,Li Y,ZHOU Y J,et al.A Combined DWT and DCT Watermarking Scheme Optimized Using Genetic Algorithm[J].Journal of Multimedia,2013,8(3):299-305.
[13]ANKITA D,ALKA J.Increase security of image from attacks using digital watermarking with SVD technique[J].International Journal of Advanced Research in Computer Engineering and Technology,2012,1(7):64-69.
[14]王磊.基于SVD变换的数字水印算法研究[D].合肥:合肥工业大学,2009.
[15]叶天语.DWT-SVD域全盲自嵌入鲁棒量化水印算法[J].中国图象图形学报,2012,17(6):644-650.