水印

It is well-known that pirating problem is becoming more and more serious with multimedia technology developing, so protecting copyright is more important. Digital watermarking technology provides a new method.

多媒体技术的快速发展，版权问题日益严重，而数字水印技术为多媒体版权保护提供了新的方法，并得到了广泛的研究和应用，因此数字水印算法成为了研究热点。

In present watermark system, there are two basic preconditions: one is robustness; the other is transparency.

在现代水印中，对水印有两个基本的要求：鲁棒性和不可见性。

At the same time, chaotic pseudo-random sequences generator based on nonlinear dynamic filter security model are constructed to select the frequency hopping points for NDFT, improving the overall system security. 3、Aiming at replay attack of networks in the remote speaker recognition systems and distributed databases speaker recognition systems, a time-stamp watermarking method is brought, which quantizes magnitude coefficients of NDFT. The time-stamp watermarking is embedded into the user's voice sample/voice characteristic information to resist on the replay attack.

同时该类算法采用以非线性动力学滤波器为基础的伪随机序列发生器构造跳频序列来选择频率变换点集合，有效提高了系统的安全性。3、针对远程说话人识别系统以及数据库分布式说话人识别系统存在易受网络重放攻击的缺陷，本文给出一种基于非均匀傅立叶变换的&时间戳&水印量化算法，通过把时间戳水印嵌入待识别用户的语音样本/语音特征信息中，可以有效解决此类缺陷。

The original carrier image is splitted into sub-blocks, and each sub-blocks is transformed by DCT to get the DCT frequencies of the sub-image. Then according to the mask charachers of the visual model of Waston, the algorithm quantizes the frequencies by DCT transform of each sub-blocks. The locations embeded the watermarks are selected by the quantization steps which calculated based on the Waston's visiual model.

该水印算法首先对原始载体图像进行分块，再分别对各子块进行DCT变换而获得各子块的DCT变换系数；然后根据Waston视觉感知模型对各子块的DCT变换系数进行量化，通过Waston视觉模型来计算量化步长，以量化步长来选择水印的嵌入位置。

You see a picture in his website do not have watermark, watermark appeared on the website that reprints his.

你在他的网站看图片是没有水印的，转载到自己的网站上就出现了水印。

In the algorithm, spited the glyph of Chinese characters to two other's, increasing the content of the document coding redundancy, enhancing the watermark capacity, and by adjusting the properties of characters displaying, enhanced the watermarking imperceptibility.

该算法通过汉字字形的拆分，增加了文档内容编码冗余，提高了水印信道容量，并通过调整汉字显示属性，增强水印的隐蔽性。

When the content of multimedia is suspected, the extraction of fragile watermark can be used to detect and localize tampers, even present the category of the tamper.

将水印嵌入到多媒体数据中，当多媒体内容受到怀疑时，将该水印提出用于多媒体内容的认证，具有非常好的效果。

It was not only warranting the robustness of the watermark information,but also meeting with the invisibility of the district by using the algorithm.

该算法利用了人眼视觉模型来选取水印嵌入区域，使其既能够保证水印信息的鲁棒性又能够满足其不可见性。

My company main products has: Bond paper , the watermark guard against false paper , take colour fibre to guard against false paper , the safety line guards against false paper , bible paper , Bible paper , food wrapping paper, the grape covers with bag special use paper , outlet, special use fruit bag paper and various specification grape cover with a bag , the pear covers with a bag , the peach covers with a bag , the mango covers with a bag.

我公司主要产品有：刚古纸黑、白水印纸，安全线防伪纸，彩色纤维防伪纸，荧光纤维防伪纸，黑、白水印、防伪线、证券纸，字典纸，刚古纸，高档防油纸，食品包装纸，筷子包装纸，白色葡萄套袋专用纸，各种出口专用水果套袋纸及各种规格葡萄套袋，芒果套袋，柚子套袋，梨套袋

Friends of Grace paper products company nanshan existing tri-color, two sets of two-color watermark machine production lines, production machinery configured carton including Taiwan detachable three-color watermark machine, MY --- 2500-type rotary slotted angle cutter, FY ---2500 points±paper type pressure-ray machine, ML --- 1300-type die-cutting machine, DX --- 1300 nail box machines that can contract a variety of specifications of high, middle and low-grade, single, double corrugated boxes, carton manufacturing, at present our factory has the production of 20 million square meters in three of five criteria for corrugated box production capacity, 50,000 cartons per day of production scale.

友宏公司南山纸品厂现有三色、双色水印机两套生产线，配置的纸箱生产机械包括台湾可分离式三色水印机、MY---2500型轮转开槽切角机、FY---2500型薄刀分纸压线机、ML---1300型模切机、DX---1300钉箱机等设备，能承揽各种规格的高、中、低档，单、双瓦楞纸箱、纸盒的制造，目前我厂已具备年生产2000万平方米三层、五层标准瓦楞纸箱的生产能力，每日5万只纸箱的生产规模。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。