This algorithm belongs to the frail watermark, it has the good safety performance and the high watermark capacity and practical value.
该算法属于脆弱型水印，拥有良好的安全性能和较高的水印容量，具有一定实用价值。
The capacity upon threshold can be calculating. At last, the relationship is analyzed between watermark extraction error rate and watermark capacity in attacking scenario.
最后分析了有攻击情况下水印提取错误率与水印容量的关系。
Through experiments the method can hide watermark in MPEG-4 video stream more rationally, the capacity of watermark increases greatly and the authentication precision locates in block level.
实验结果表明，算法更合理地将水印嵌入在MPEG-4视频流中，水印容量得到较大提高，对恶意攻击的认证精度定位在块级别。
Reseatch result shows that watermark detection error is mainly influenced by the watermark mean energy and watermarking capacity. The detection error rises with the increase of watermarking capacity.
研究结果表明，水印检测错误率主要取决于水印的平均能量和水印容量，而且随着水印容量的提高而增加。
Theories related to watermark are introduced in detail, including communication model, related detection model, hiding information capacity analysis and security of steganography.
从水印的通信模型建立，水印的相关检测模型，到信息隐藏容量分析，隐写术的安全性理论，详细介绍了水印的相关理论；
Equally, spreading spectrum technology can improve the performance of watermark technology greatly, but it will increase the capacity of channel and the calculation of the algorithm as cost.
应用扩频原理，能大大改善水印嵌入的不可感知性。但由于采用扩频调制后，一个水印信息要用一个周期的伪随机序列调制，因此会增加嵌入的水印量。
In order to solve in the image inserts the large capacity watermark difficulty major problem, designed and has realized one kind newly based on the TURBO codes robust digital watermark algorithm.
为了解决在图像中嵌入大容量水印难度大的问题，设计并实现了一种新的基于TURBO编码的鲁棒性数字水印算法。
Because of the limitation of their characteristic, video watermark technique has less hiding capacity, they can't meet the need of large data secret communication or information intercept controller.
然而数字水印由于其本身的特性限制，使得一般的隐藏量都很少，无法满足一些大数据量的秘密通信和信息获取控制方面的要求。
So this scheme is an easy and high efficient method to embed watermark. And the capacity of watermark can be doubled by judging four regions.
由此表明，该算法是一种简单、高效的视频水印隐藏方案，并且细化区域的分类，可以达到使隐藏的水印信息加倍的效果。
So this scheme is an easy and high efficient method to embed watermark. And the capacity of watermark can be doubled by judging four regions.
由此表明，该算法是一种简单、高效的视频水印隐藏方案，并且细化区域的分类，可以达到使隐藏的水印信息加倍的效果。
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