Aiming at the low efficiency in current architectures of digital watermarking , it provides a new architectureasymmetric digital watermark . this architecture has the third trusted party as the center . and by using two watermarks secret watermark and public watermark and watermark browser , users can independently extract and display the intellectual property information hidden in the digital multimedia . it not only makes the intellectual property information public , but also highly improves the efficiency . in the results , this architecture can protect the intellectual property of creators , avoid users from unauthorized use , and regular the authentication and the management of the intellectual property 针对当前的数字水印实施架构中存在的低效问题，提出了一种新的架构非对称数字水印。该体制以第三信任方为中心，通过使用二次水印秘密水印和公开水印和“水印浏览器” ，使版权信息的提取与显示均可在用户端独立完成。在版权信息“公开化”的同时，极大地提高了整个架构运作的效率。
The other method is to embed a grayscale image watermarking ( which involves the copyright message ) into a color image through considered from the practical application . in this arithmetic , we embed the watermark into the dwt coefficients of color image luminance ( y ) component , so that the color of original image will not be affected . we also employ the multiresolution fusion techniques of the image and adopt the divided method for repeat embeds 二是从实际应用考虑，又进一步研究了如何将标识版权信息的灰度图像作为水印嵌入到彩色图像中，通过讨论图像的颜色模型，提出将水印嵌入到图像yiq模型中的亮度y分量中，这样嵌入水印时，宿主图像的颜色不会受到影响，使水印后图像保持了较好的视觉效果。
When the watermarking bit is destroyed , which position can be judged exactly , and then block checkout and hamming checkout are used to recover it . meanwhile , watermarking can be extracted without the original document and original watermarking information , which is significative copyright information , so it is a public watermarking technology 抗攻击时,能准确判断水印比特位受破坏的具体位置,并能通过块校验和海明校验将破坏的水印比特位进行适当恢复;同时,提取水印时既不需要原始文本,也不需要原始水印,且提取的水印信息是有意义的版权信息,是一种公开水印。
The advent of the internet and the wide availability ofcomputers , scanners and printers make digital data acquisition , exchange and transmission a simple task . however , making digital data accessible to others through networks also creates opportunities for malicious parties to make salable copies of copyrighted content without permission of the content owner . digital watermarking is likely to be a potential solution to this problem . digital watermarking has been proposed as a solution to the problem of copyright protection of multimedia documents in networked environments . it makes possible to embed a watermark ( such as identification data , serials number , text or image etc . ) to multimedia documents allowing copyright protection , secret communication , document authentication and so on . in this paper , we present a new digital image watermarking method based on svd ( singular value decomposition ) , and then give some theoretical analysis about the algorithm . extensive experimental results show that this method is much more robust than other methods presented before 随着计算机和网络技术的飞速发展，数字图像、音频和视频产品愈来愈需要一种有效的版权保护方法，另外通信系统在网络环境下的信息安全问题也日益显露出来.数字图像水印技术为上述问题提供了一个潜在的解决方案.所谓水印技术就是将数字、序列号、文字、图像标志等版权信息嵌入到多媒体数据中，以起到版权保护、秘密通信、数据文件的真伪鉴别和产品标志等作用.本文提出了一种新的基于奇异值分解的数字水印算法并且对该方法的理论基础给出分析.实验结果表明这种方法要比目前提出的流行算法鲁棒
The method segments the original document into paragraphs and determines the parameters of sine wave by the characteristic of related text block . then the watermark can be embedded . after the modification , the alteration of the grayscale shows characteristics of corresponding sine wave ; next , a scheme for copyright marking is proposed , which embeds the copyright information into the text document to provide protection 即将原始文本按段落分成多个相对独立的块,由与该块相关的文本特性决定正弦波的参数,然后通过改变块内字符的灰度值,嵌入对应的正弦波;其次,提出了一种用于版权标识的水印算法,将版权信息嵌入文本,保护其所有者的权益。
In recent years , some new concepts of information security have been proposed , especially in the application of intellectual property right protection , copyright protection and tamper - proofing . information hiding and digital watermarking are new measures of digital media protection , which are processes of embedding hidden messages within digital media such as text , images , video and audio . the hidden messages could be copyright information , user distributor identification number , company logo , personal signature , control bits , or any information considered useful for a specific application 信息隐藏与数字水印技术就是一种新的数字媒体保护措施，它是将特定的信息（如版权信息、秘密消息等）嵌入到图像、语音、视频及文本文件等各种数字媒体中，以达到标识、注释及版权保护等目的，同时，这种信息对宿主媒体的影响不足以引起人们的注意且具有特定的恢复方法，此信息对非法接收者应该是不可见、不可察觉的。
