水印

While embedding watermarking, the watermarking sequences are produced by the chaos system,and are embedded into the low frequent coefficient of DWT domain to guarantee the robustness of watermarking.

该技术在水印嵌入时，由混沌系统生成水印序列，并在离散小波变换的低频子带上嵌入水印，保证了水印的鲁棒性。

At this text I bring forward effective project strategy of non-maturity haleness watermark model arithmetic. Making use of time-frequency local characteristic of wavelet switch, I bring forward digital image watermark insetting project basing on block of wavelet switch, at the first ,make the image disporting to block of 8×8,then make use of the characteristic of Haar wavelet switch,then make the image the second layer wavelet switch and carry through power modulus transaction.

本文提出了非完备性鲁棒性数字水印典型算法中的行之有效的设计策略，利用小波变换良好的时频局部特性，提出了基于块的小波变换的数字图像水印嵌入方案，把宿主图像分为8×8的小块，利用 Haar小波变换的特性，对图像进行二层小波变换分解，对变换系数进行权重处理，然后把每一个水印象素隐藏在相应的图像块的中低频小波系数之中，提高了数字水印的隐蔽性和鲁棒性。

A robust watermarking algorithm based on repeat imbedding technology was proposed.

提出了一种基于重复嵌入技术的鲁棒水印算法，采用置乱技术对水印进行伪随机化和水印加密处理，水印检测时采用了一种新的三取二判决技术。

A novel algorithm for audio watermarking based on quantizing DCT domain is proposed,the authors design watermarking algorithm according to DC and AC DCT coefficients play different influence in robustness and inaudibility to tradeoff robustness and inaudibility better.

提出一种新的基于量化DCT域的音频水印算法，根据DC分量和AC分量在水印的鲁棒性和不可听性中起着不同的影响来设计水印算法，使水印的鲁棒性和不可听性得到更好的权衡。

In every period, do the following operations:# For each 8*8 block, do the discrete cosine transform, then take out direct current coefficient in each block, using the transformation above for each DC coefficient, the gold stands for the code of the spread-spectrum we use when embedding the different watermark bit in different frames, after all of the watermark information which we want to embed is embedded, then do the inverse discrete cosine transformation, and store the current frame in a new file.

于是利用DCT变换域的这点重要的几何不变性，我们可以推导出一种能够抵抗几何攻击的视频水印算法，即将所需要嵌入的水印信息以127位扩频序列作为辅助，以求和值形式嵌入到DCT变换后的每个宏块的每个DC系数当中，具体嵌入和提取算法如下：根据使用的扩频序列的长度N，基于相关的嵌入器需要选取包含N帧的视频子序列，令这N帧视频子序列作为一个嵌入周期，对于每N帧视频子序列做如下的操作，#即对于每个8×8的像素块进行DCT变换，然后取出每个DCT变换后的直流分量，对于每个DC系数，做如上所述的变换，其中gold为在第k帧中嵌入第i位水印信息时使用的扩频码字值，待将所有需要嵌入的水印信息全部嵌入后，再做反DCT变换，保存当前帧。

Application of Digital Watermarking and the benchmarking software: Image Watermarking in the discussion of a wide range of applications and the impact of image watermarking system, an important parameter based on a variety of digital watermarking typical way to attack a more complete analysis, the final typical of the existing benchmarks are discussed, pointing out their limitations.

详细说明：图像数字水印的应用及基准测试软件：在讨论图像数字水印的各种应用及影响图像数字水印系统的重要参数的基础上，对数字水印的各种典型的攻击方式进行了较完整的分析，最后对现有的典型基准测试程序进行了探讨，指出了它们的局限性。

The generation of watermark information is based upon quadratic residue theory and Rabin cipher system.

水印信息的产生基于二次剩余理论和Rabin密码体制，该算法在多个水印与宿主程序之间建立功能性的依赖关系，对真实水印起到防篡改的作用，增加了攻击难度，从而可对该类水印进行有效保护。

Based on the proposed synchronization schemes, two robustimage watermarking schemes are presented, which embed the watermark indiscrete wavelet transform domain and spatial domain respectively.Besides, the original image is not needed in watermark detection.

针对所提出的两种水印同步方案，分别提出了两种鲁棒图像水印算法，分别在离散小波变换域和空域嵌入水印，且水印提取不需要原始图像。

Firstly, to ensure the security of wartermark,the wartermark image is Arnold scrambled before embedding and expanded to the twifold size of the original image.The corresponding subband data of the watermark and the red,green,blue weight for original image are combined according to the characteristic of the multiresolution decomposition of the wavelet transform.

首先，为保证水印的安全性，在嵌入之前先对水印图像作Arnold置乱处理，再将水印图像位扩展为原始图像的两倍大小；然后根据小波变换的多分辨率分解特性，将位扩展水印和原始彩色图像红色、绿色、蓝色分量对应方向上的子带系数进行组合。

The method first embeds watermark into the geometric invariant Fourier-Mellin domain of an image to weaken the geometric distortion, brought by printing process, of the watermark in presswork, and the image is then used to create presswork via a legal printing process. Secondly, the method rectifies rescanned image from the presswork by using Radon transformation and the embedded watermark in it is detected. Since there is an obvious difference between the destruction degrees of the watermark caused respectively by legal and pirated printing process, we can judge whether a copy of presswork is valid or not just by computing the ratio of the successfully derived watermark and comparing it with a predefined threshold.

该方法先将水印嵌入到具有几何不变性的Fourier-Mellin域中，以削弱正版印刷过程中的几何失真对水印的破坏；再利用Radon变换对由扫描印刷品所获得的图像进行矫正，并从图像中提取嵌入的水印信息；由于正版和盗版印刷过程对水印的破坏程度区别明显，该方法最终通过计算水印提取的正确率来度量这种破坏，并将其与预先制定的阈值进行比较来判定印刷品的正伪。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。