Most watermarking algorithms proposed mainly address the problem of global affine transforms,such as RST,but the local geometrical attack is still intractable.
2、提出一种可以抵抗随机变形攻击(RBA)的多比特水印算法。 目前大多数文献中的抗几何攻击水印技术都是重点针对全局几何形变的,例如仿射变换中的RST,而针对局部几何攻击的研究却很少。
参考来源 - 抗几何攻击的信息隐藏技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Experiment results show that this algorithm can restore distortion caused by global and local or no-linear geometrical attack, and it is practical and effective.
实验结果表明，该算法可以从全局和局部或非线性几何攻击中恢复失真，是实用和有效的。
In order to improve performance of resistance to the geometrical attack while keep invisible, a zero-watermark algorithm for digital image based on Fourier-Millin transforming is proposed.
为了提高抗几何攻击性能，同时保证不可见性，提出了一种结合傅立叶-梅林变换和零水印概念的图像水印算法。
It is found that the variation of planforms and geometrical parameters can effect only the drag reduction but little to the low lift in low angle of attack condition.
发现单纯改变涡襟翼的形式和参数能提高减阻效果，但不能改变小迎角下升力过小的现象。
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