水印

The unwatermarked full-size file is shared with the original, all other versions of the item (thumb, resizes, watermarked fullsize) are new and not shared.

无水印效果的全尺寸文件与原始文件共享，该项目的其他版本（缩略图，重设尺寸图片以及水印效果的全尺寸图片）是新的且不被共享的。

And the attributes, classing and applying matter of digital watermarking technology is presented in a nutshell. Some typical algorithms and performance is analyzed. Then three algorithms based on DCT are carried out.

然后在MATLAB环境中实现了三种基于DCT的数字水印算法，并通过各种常见的图像处理、压缩、剪切和加噪等各种攻击实验验证了这三种算法所生成水印的性能。

And by disordering the position of the image block that the watermarking pixel embed into,the watermarking is more secure and robust.

同时，将水印点嵌入到图像块中的位置进行随机置乱，提高了水印的安全性以及稳健性。

The digital watermark was hided by the modification of DCT coefficient of chromatism in the YC_bC_r, the matrix of chromatism was disparted into 8×8 blocks, which were divided into two types by the density of edge point, then the watermark components with different strength were hided into the blocks according to the classification.

利用彩色图像在YCbCr域内对色差分量的DCT系数的改变加入水印，将色差分量矩阵进行8×8分块，根据每个小块内边缘点的密度将所有小块分成两类，不同类的小块分别按照不同的拉伸因子，加入水印信息。

In this scheme, two kinds of watermarks are embedded respectively into vertexes coordinates and topological information of 3D mesh, which enables the model to resist against not only large scaled cropping operation but also high strong noising. During the extraction of the watermark, the original model is not necessary.

该算法分别对3D网格模型的顶点信息和拓扑信息嵌入2种不同类型的单鲁棒性水印，从而使模型既能抵抗大面积的剪切攻击，又能抗击一定强度的噪声攻击；且在水印提取时不需要原始模型信息。

The DRM technology based on cryptography and watermark is deeply researched in this thesis, including the DRM protecting modes and the DRM protocols, the software obfuscating technique and its integrating with software watermark.

本论文基于密码和水印对数字版权保护技术进行了深入的研究，包括数字版权保护模式及其协议研究，软件混淆技术及其与软件水印结合的研究。

Watermarks are stochastically permuted and coded by LDPC to improve the robustness against attacks.

水印嵌入之前进行随机置换与LDPC编码增强了水印抗攻击能力。

The watermarking information that is stochastically permuted and coded by LDPC is embedded in the modified DC components which are attained by integer transform twice.

水印信息经随机置换与LDPC编码，对经过二次整数变换之后的直流分量进行修改实现水印的嵌入。

It made full use of the invisibility of the Human Vision System in the algorithm. The watermarking digitals were divided into bits plane. Every bits plane were permuted and converted into 1-D array.

算法充分利用人类视觉系统的掩盖效应，将水印图像数据分成比特平面组，并将每组的比特平面置乱后转化成一维水印序列。

In order to average the spatial distribution of embeddable pixels, by permuting the original image randomly and dividing it into blocks, we embed the same quantity of watermark into every block.

为了均衡可嵌入水印像素的空间分布，对原始图像进行随机排列和分块后，在每一块中嵌入相同数量的水印。

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。