水印

However, there exists important difference between watermark channel and common communications channel, which results in some problems in the application of communications theory.

然而，数字水印信道与一般通信信道之间有着比较大的差别，使得直接在水印信道中应用通信技术存在着许多问题。

The CDMA style watermarks are embedded into the large number of motion information of compressed video.

相比传统的基于运动信息的视频水印算法，这种CDMA形式的算法对抗几种典型视频水印攻击的能力大为提高。

A correlation function is used in the watermark detection process in two watermarking methods.

两种水印算法的水印检测都采用了相关函数来进行。

To further improve the robustness against geometric attacks, an image watermarking method is proposed based on normalized affine covariant regions.

3为了进一步增强图像水印系统对几何攻击的抵抗能力，提出了一种基于归一化仿射协变区域的水印算法。

And watermark image is embedded by the rule of the improved binary operation,changing wavelet coefficients part of the decimal to improve the quality of the image after the watermark embedded.

水印嵌入采用改进的二值运算方法，修改小波系数的小数部分，以提高水印嵌入后图像的质量。

Second, analyzing principle of the singular value decomposition and the principle of wavelet transform deeply at all levels, as well as the impact to image processing and singular value decomposition wavelet analyzing, focus on single watermarking and double watermarking algorithm based on the discrete wavelet transform.

其次，深入分析了奇异值分解的原理和小波变换的原理以及图像处理对各级小波分解和奇异值分析的影响等，重点研究了基于离散小波变换的单水印和双水印算法。

Experimental results show that the algorithm has both good detectability and high robustness.

通过对不同测试图像、不同图像攻击的试验仿真，论证了该水印算法具有较强的水印检测能力和攻击鲁棒性。

Experimental results show that the new algorithm has better detectability than the object-based watermarking algorithm.

通过对不同攻击的试验仿真，和不同算法的性能比较，论证了新的水印算法在保持自同步检测能力的同时，具有更高的水印检测率。

It is generally provided with some characteristics such as imperceptibility, detectability and robustness etc.

水印攻击手段和测试结果评价是建立水印测试基准的两个重要组成部分。

At the same time, we analyze and modify the channel model of digital watermarking in theory, it will help us understand the crux of digital watermarking technique.

在所有的数字水印技术中，数字视频水印技术因其很可能成为数字视听产品版权保护系统的核心技术，而倍受电子厂商所关注。

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。