水印

On the research of robustness of watermark there are three aspects: first, we analyze the influence of low-pass filter to digital watermark.

对鲁棒水印技术问题的研究，包括以下三方面：首先，分析了低通滤波对数字水印鲁棒性的影响。

Put forward digital watermarking method based on wavelet transform and Markov random field.The method that is proposed in the paper brings Markov random field into digital watermarking technique. Uses MRP to model visual impression of image, obtains allowable distortion of every pixel.

3提出了基于小波变换与马尔可夫随机场的数字水印方法本文将马尔可夫随机场引入到数字水印技术中来，利用其对图像视觉效果建模，求取各象素点的允许失真值。

SVD is used to extract singular value which is embedded copyright protection into digital audio based on modular arithmetic.

将数字音频信号用奇异值分解所得的奇异值作为水印的嵌入系数，对该系数采取模2取余的方法作为水印嵌入策略。

School of Information Engineering,Zhengzhou University,Zhengzhou 450052,ChinaA novel chirp-typed watermarking scheme which uses the properties of index additivity and orthonormality of fractional Fourier transform to embed watermark in the different fractional Fourier domain is presented.

提出了一种新的分数阶Fourier域Chirp类数字水印方案，该方案利用分数阶Fourier变换基函数的正交性和旋转相加性，在不同的分数阶Fourier域嵌入Chirp水印，并利用分数阶Fourier域Chirp信号的聚集性进行盲检测。

The protocol can effectively prevent against the collusion attacking by buyer and the third party, the collusion attacking by seller and the third party, and the intermediate personate attacking.(3) A new buyer-reseller watermarking protocol is proposed in the thesis.

提出了一种新的交互式买方—卖方数字水印协定，通过采取新的水印嵌入和加密计划，有效地阻止了买方与第三方、卖方和第三方的合谋攻击，以及中间人攻击。

Digital watermarking routines, including several commonly used functions, a number of different algorithms to achieve the digital watermark, practica...

数字水印的例程，包括多个常用函数，多个不同算法实现的数字水印，级实用！

It is a technique that applying the thought of the QR decomposition to the fragile watermarking.

该算法不仅能检测到水印图像的任何改动，同时保证了水印图像的质量。

To improve the security of watermarking system, the shuffle algorithm is also adopted to randomize the watermark sequence to increase the attack difficulty.

为提高水印系统的安全性，在上述除第一种之外的所有算法中都利用了shuffle算法对水印序列进行置乱，增大了攻击的难度。

Through the analysis of many representative spatial domain watermarking algorithm, a novel image spatial domain blind watermarking algorithm was presented.

通过对多种空域水印算法优缺点的分析，提出了一种新的图像空域盲水印算法。

Changsha 410083, China）Abstract: Through the analysis of many representative spatial domain watermarking algorithm, a novel image spatial domain blind watermarking algorithm was presented.

摘 要：通过对多种空域水印算法优缺点的分析，提出了一种新的图像空域盲水印算法。

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。