【作者】 赵榕；

【导师】 朱清新；

【作者基本信息】 电子科技大学 ， 计算机软件与理论， 2003， 硕士

【摘要】 多媒体技术和网络技术的发展，给人们带来了丰富多彩的视听娱乐的数字产品。但是由于数字产品复制不会引起质量下降，因此出现的大量盗版现象严重地损害了生产商和著作者的积极性，数字产品市场迫切需要加强版权保护工作的手段。数字水印技术作为数字产品版权保护的有效手段，成为多媒体安全研究的热点，其中视频数字水印成为近年来新的研究热点，有许多学者针对现有的国际视频标准提出了多种视频水印方案。 本文对图像水印技术和视频水印技术的发展和现状及主要技术方法作了介绍，以及离散小波变换在水印技术中的应用前景和方法。在此基础上针对视频与图像的异同点，分析比较了静态图像水印和视频水印特点的异同，并且结合在Internet上传输视频时，网络自身的特性(比如带宽资源等)对视频流产生的影响，以及这些影响对视频流水印技术的特殊要求，结合基于对象的视频编码标准MPEG-4的特性，提出了在视频对象中利用基于小波变换的水印方案。 该方案考虑了MPEG-4视频编码基于对象的特性，以及伸缩特性对视频水印的特殊要求，结合小波变换的多描述特性，该特性允许水印除了在最底层检测以外可在各个分辨率进行，这样就能够实现在视频质量最低的情况下也能够检测到水印，从而提高了水印在视频流中的鲁棒性。最后分析了基于对象的视频流水印的优点。更多还原

【Abstract】 With the development of multimedia and Internet technology, there are more and more digital products for our entertainment and it can be easily copied and delivered on Internet without any loss in quality. So more and more pirates strongly hurt the producer and author’s interests. An effective method is required to protect the digital products. Digital watermarking is such an effective method and it attracts many researchers, especially digital video watermarking. In recent years there are many digital watermarking techniques for popular video compression standards.In the paper some images and video watermarking techniques are introduced, including their development and general method to research. It also covered with wavelet for it’s role in JPEG2000 and MPEG-4 and it’s application in watermarking with its multiresolution property. Comparison and analysis of image and video’ watermarking is made based on the difference between images and video. When the digital streaming video is transmitted on Internet, it will be affected by the network, such as bandwidth, so the paper also deals with streaming video watermarking and its exclusive requirement. At the last chapter, an object-based watermarking algorithm has been presented.The watermarking algorithm for MPEG-4 compression is devoted to address the influence from the rate scalability, based on static texture object in MPEG-4 and watermarking in wavelet domain. The possibilities and advantages that an object-based watermarking combined with watermarking agent techniques are pointed out.更多还原