水印

The method has some characteristics:(1) it adapts to medical images authentication due to the high Signal-to-Noise when the watermark was embedded into images.(2) It ensures the fragileness of watermark when it combines with the statistical information of wavelet coefficient to choose the embedding position.(3) It has a strong localization ability for tampering because of the characteristics of wavelet decomposition in the space-frequency domain.(4) It uses the secret key which can resist the malice attack even if opening the algorithm completely to protect the proposed method.

本算法具有以下几个特点：(1)图像嵌入水印后具有较高的信噪比，适用于医学图像的认证；(2)结合小波系数的统计信息来选择嵌入水印的位置，保证了水印的易碎性；(3)小波分解在空频域的特性使得算法对篡改具有很强的定位能力；(4)利用密钥对算法进行保护，即使公开算法，也能抵挡恶意攻击。

The watermark information which is generated by subsidiary secret keys of binary sequence can prove copyright of composer intuitionally.

提取水印信息的时候，无需原始音频信号的辅助，首先提取出子密钥水印图像，再与先前的子密钥叠加恢复水印。

A new algorithm for digital audio watermarking is proposed in this paper. This algorithm bases on the wavelet transform. By using this algorithm, the watermarked speech signal sounds the same as the original one. The tiny difference is neglectable by human ear.

主要研究了在数字语音信号中加入数字水印的方法，提出了一种基于小波变换的数字水印隐藏与检测算法，用这种算法隐藏水印具有很强的隐蔽性，对原始语音的影响基本上察觉不出来。

This paper proposed a new approach to watermark attack which s based on the blind signal separation,we described its characteristics and put up a applicable odel ,all these may have a good effect on the watermark studies henceforth .

本文从理论上提出了一种基于盲信号分离技术的水印攻击方法，描述了其技术特点，并建立了相应的应用模型，可以推断，新方法的使用会对改进水印算法和水印检测的研究起到良好的作用。

Watermark is inserted into perceptually significant Krawtchouk moments of original, and watermark based on Krawtchouk moments is local.

水印信号嵌入到图像的低阶Krawtchouk矩中，这种基于Krawtchouk矩的水印算法是局部水印技术。

The original video is spitted into a series of frame groups,for each frame in the group,the points of contour shape are described by MPEG-7,and taking advantage of hash function to calculate the keys between those points in the 1D- DFT transform domain and the watermark signals.

在该算法中，原始视频数据被分割成等帧数的视频组，利用MPEG-7的轮廓编码计算每个视频帧的主要物体轮廓坐标点集合；接着通过傅立叶变换得到该帧轮廓点形状不变量，利用哈希的方法计算水印信号并将这些不变量的有效值作为密钥之一；再对整个视频组的轮廓点进行傅立叶变换，得到其时间轴上的有效不变域，将水印信号嵌入在这个不变域的中频部分以确保了水印的鲁棒性。

According to the similarity both in aliasing /separation of signal of the ICA model and the embeding/extraction process in the watermarking system, the scrambling image is embeded into the wavelet domain with the linear supraposition.

根据ICA模型中的信号混叠/分离与数字水印嵌入/提取过程之间的相通性，以线性叠加的方式将置乱水印嵌入到图像小波域的某些系数上，检测/提取时通过ICA技术提取水印。3。

At first, this paper introduced watermark technology synoptically. It summarize the algorithm model and attack means of the watermark and generalized the existing picture watermark algorithm.

本文首先对水印技术进行了概括性介绍，总结了水印算法模型和攻击手段，概括了现有的图像水印算法。

The articale makes a brief introduction of the applying background to the technology, as well as its basic characteristics. it also analyses the present typic watermark inset-algorithm and checking means, further tells some key technologies in practical application, points out a wide prospect digital video watermarking technology will certainly have.

在简要介绍数字视频水印技术的应用背景和基本特点的基础上，分析了目前常用的水印嵌入算法和检测手段，并指出了实际应用中应注意的一些关键技术，指出数字视频水印技术必将有一个广阔的发展前景。

Digital watermarking, which can overcome some uncontrollability issues for decrypting encrypted messages, has become a new information security area under this circumstance.Currently, Watermarking researches are mostly focused on image and video instead of text.

目前关于水印的研究主要集中在图像和视频等方面，对于文本数字水印研究的很少，已有的一些文本水印算法主要是通过轻微改变字间距，行间距或字符特征等方法来实现。

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。