【作者】 李峰；

【导师】 周宁；

【作者基本信息】 武汉理工大学 ， 通信与信息系统， 2012， 硕士

【摘要】 数字水印技术是一种用来进行数字作品版权保护的先进技术,近年来数字水印的研究也一直是图像处理的热点问题之一。在获取信息越来越便捷的时代,各种非法版权的图像信息也充斥着网络,利用数字水印技术可以有效的对抗盗版和数字作品非法复制传播。由于变换域的多分辨率分析特性与人类视觉系统(HVS)特性的一致性,结合变换域的特点和HVS的特性,对于水印嵌入位置和水印嵌入强度具有很大的帮助。各种研究也证明了结合HVS的变换域水印算法可以在保证原始数据视觉质量的前提下,有效地增加水印信息的鲁棒性。本文首先设计了一种基于DWT和HVS的自适应数字图像水印算法,可以自适应的根据视觉门限JND确定水印嵌入位置,这样不仅可以将水印嵌在鲁棒性更高的低频区,有效的抵御各种滤波攻击,还可以保证载体图像的不失真性。其次,设计了一种基于HVS的鲁棒水印算法,运用DCT,SVD,HVS三种理论,根据HVS的特性,将水印图像自适应的嵌入到原始图像经过DCT变换后的奇异值中,可以实现盲检测,并能保证在较高PSNR值的情况下,仍然保持了水印图像的不可见性,同时算法也有很好的鲁棒性。最后,设计了一种基于Curvelet的鲁棒水印算法,将水印图像自适应的嵌入到原始图像经过Curvelet变换后的系数中,也能很好的在数字水印算法的鲁棒性和不可见性之间达到一个很好的平衡,并且可以盲检测。更多还原

【Abstract】 Digital watermarking technology is used for the advanced technology of digital copyright, the study of digital watermarking has been one of the hot issues of image processing in recent years. Access to information more convenient times, the image information of all kinds of illegal copyright filled with network, by using of digital watermarking technology can be effective against copying.Due to the consistency of the transform domain multi-resolution analysis of the characteristics and the human visual system (HVS) characteristics, Combine the characteristics of the transform domain and HVS characteristics, can be a great help to the watermark embedding position and the embedding strength. Various studies also proved with HVS in the transform domain watermarking algorithm can effectively increase the robustness of the watermark information on the premise of ensuring the quality of the raw data of visual.I designed a adaptive digital image watermarking algorithm based on DWT and HVS in this paper in the first place, the algorithm can adaptive determine the embedding position by the visual perceptual threshold JND, the algorithm can embed the watermark in the higher robustness of the low frequency region that can resist all kinds of filtering attacks effectively, but also guarantee the image without distortion.Secondly, I designed a robust watermarking algorithm based on HVS by use of the DCT, SVD and HVS theories, according to the HVS characteristics, make the watermark embed into the singular value after DCT transform adaptively, and can ensure that the watermark is not visible in the case of high PSTR value, at the same time, the algorithm also has good robustness.At last, I designed a robust watermarking algorithm based on Curvelet transform, make the watermark embed into the coefficient after Curvelet transform, can also be able to achieve a good balance between robustness and invisibility, can achieve blind detection.更多还原