摘要
针对目前二维钱方法运行时间缓慢的问题,提出二维钱方法的快速优化方案并将改进后的二维钱方法应用于数字水印中。将载体图像进行二维钱方法分解,提取分解之后的某个高频分量对其进行离散余弦变换(DCT);将置乱后的水印图像嵌入到经DCT变换后的中频分量中,将载体图像的所有分量进行合成,得到含水印图像;水印的提取是通过含水印图像与剔除掉上述高频分量的载体图像进行相减得到。实验结果表明,提取出来的水印与原始水印相似程度很高并对缩放、压缩、噪声、滤波等攻击处理也具有较好的鲁棒性和不可见性,利用二维钱方法来实现数字水印的嵌入与提取有良好的透明性和鲁棒性。
For the problem of slow running time of current two dimensional Qian method,a fast implementation of two dimensional Qian method was proposed.The two dimensional Qian method was applied to the digital watermarking technology.The vector images were decomposed using the two-dimensional Qian method.After the decomposition,one high frequency component was extracted and subjected to discrete cosine transform.The watermark image after scrambling was embedded into the intermediate frequency component of the DCT.All the components of vector images were synthesized into a watermarked image.The watermark was extracted by subtraction of watermarked image and vector image in which the high frequency component was removed.Experimental results show that the watermark extracted using this algorithm has high degree of similarity to original watermark.And the algorithm has better robustness and invisibility to various kinds of attacks.The two dimensional Qian method is used to achieve the digital watermark embedding and extracting and it has good transparency and robustness.
作者
吴明珠
王洋
李兴民
WU Ming-zhu WANG Yang LI Xing-min(Computer Department, Guangzhou College of Commerce, Guangzhou 511363, China School of Computer, South China Normal University, Guangzhou 510631, China)
出处
《计算机工程与设计》
北大核心
2016年第11期3136-3140,F0003,共6页
Computer Engineering and Design
基金
国家863高技术研究发展计划基金项目(2012AA021105)
国家自然科学青年基金项目(61402185)
广东省育苗工程基金项目(2013LYM_0118)
2016年广东省创新强校工程教学改革基金项目(GDJG2016001)
关键词
二维钱方法
快速实现
数字水印
离散余弦变换
鲁棒性
two-dimensional Qian method
fast implementation
digital watermarking
discrete cosine transform
robustness
