水印

Based on the hypercomplex Fourier transform, a novel frequency domain watermarking algorithm for color host images is proposed.

针对彩色载体图像，提出了一种彩色图像超复数频域的水印算法。

Keeping the terrain figure and hypsography, the digital watermark is robust.

该算法在保证地形形状和起伏特征的前提下，提高了水印的鲁棒性。

Illegal access to system, edition, and forgery of multimedia document is proven to be impossible.

系统采用双重身份认证机制和易碎水印内容认证机制，使得非法接触以及修改、伪造多媒体信息的内容都是不可能的。

At the same time,according to the characteristics of human vision system,the original ima.

同时，根据人类视觉系统的特点，对原始图像进行分块处理，将加密后的水印分别以不同的强度嵌入并提取，给出了改进的嵌入提取方案。

In this paper a digital watermarking scheme is proposed based on a combination of Harris feather point and image normalization.

利用Harris特征点并结合图像的归一化原理提出了一种新的数字水印方案。

This paper presented a robust image watermarking algorithm utilizing the stability of SIFT points and the features of DWT.

利用数字图像SIFT(scale invariant feature transform)特征的稳定性和小波变换的特性，提出了一种抗仿射变换和剪切的鲁棒水印算法。

This method uses a threshold T to choose the blocks of halftone image to imbed information,which imbeds data as many as possible under the guarantee of the quality of the halftone image.

该方法利用了阈值T来控制水印的嵌入位置，在保证图像质量的前提下，嵌入尽可能多的数据。

The results showed that the algorithm realizes the watermark's imbedding and extracting; it also is robust. The digital watermarking technology can be used to protect the security of digital images and the copyright.

结果证明该算法能够实现数字水印的提取和检测，并具有较强抵抗常见攻击的能力，鲁棒性较好，能够实现初步的数字图像的防伪和版权保护。

The results showed that the algorithm realizes the wa'termark's imbedding and ex-tracting; it also is robust. The digital watermarking technology can be used to protect the security of digital im-ages and the copyright.

结果证明该算法能够实现数字水印的提取和检测，并具有较强抵抗常见攻击的能力，鲁棒性较好，能够实现初步的数字图像的防伪和版权保护。

Imperceptibility and robustness, which are the basic requirements of digital watermark, conflict with each other.

不可察觉性和鲁棒性是图像水印中基本要求，但它们却是一对互相制约的因素。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。