| 基于DCT与SVD相结合的图像水印新算法 |
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| 引用本文： | 吕东岳,徐贵力,李开宇,田裕鹏. 基于DCT与SVD相结合的图像水印新算法[J]. 电子科技, 2011, 24(5): 112-115 |
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| 作者姓名： | 吕东岳 徐贵力 李开宇 田裕鹏 |
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| 作者单位： | (南京航空航天大学 自动化学院,江苏 南京 210016) |
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| 摘 要： | 基于奇异值分解的水印算法中,利用正交矩阵实现水印的嵌入保证了水印的不可替换性.但在修改正交矩阵时,如果不保持矩阵的正交性,就会对提取出水印的正确率产生影响.为了解决这一问题,提出了一种基于二维离散余弦变换与奇异值分解相结合的数字图像水印新算法.在水印嵌入时,对图像子块的DCT系数矩阵进行SVD分解,利用三角函数的正交性...
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| 关 键 词： | 离散余弦变换 奇异值分解 正交矩阵 水印 |
A New Image Watermarking Algorithm Based on DCT and SVD |
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| Lü Dongyue,Xu Guili,Li Kaiyu,Tian Yupeng. A New Image Watermarking Algorithm Based on DCT and SVD[J]. Electronic Science and Technology, 2011, 24(5): 112-115 |
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| Authors: | Lü Dongyue Xu Guili Li Kaiyu Tian Yupeng |
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| Affiliation: | (College of Automation,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China) |
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| Abstract: | Among all watermarking algorithms based on singular value decomposition（SVD）,using the orthogonal matrices assures non-replacement of watermark,but it will affect the accuracy of the watermark if the orthogonality is not maintained.In order to solve this problem,a novel binary watermark algorithm based on discrete cosine transform（DCT） and SVD is proposed.The left orthogonal matrices of host image＇s sub-blocks＇ DCT coefficients are modified according to the orthogonality of trigonometric function to embed watermark bits in the proposed algorithm.Experimental results show that compared with current algorithms using SVD,the orthogonality of the left orthogonal matrices is maintained.The results also show higher extracting accuracy in resisting JPEG compression and salt and pepper noise. |
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| Keywords: | discrete cosine transform singular value decomposition orthogonal matrix watermark |
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