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Experimental results show that imperceptibility and robustness are improved by 8.94% and 9.88% averagely.

实验表明,不可见性与鲁棒性平均提高8.94%和9.88%。

Finally, simulation experiments of two algorithms are carried out, results demonstrate that the watermark is invisible and robust against some attacks, such as crop, common noise and JPEG compress. It also has certain counteractant ability against a comprehensive attack.

仿真结果表明,实现的水印具有不可见性,而且对于常见的噪声、剪切、JPEG压缩具有较强鲁棒性,对于综合性攻击也具有一定的抵抗能力。

At the time this really helped crystallize our thoughts on how invisible and direct we would like any interface to be.

同时它也对我们在多媒体界面的不可见性和直接性方面的研究很有帮助。

In addition,dynamical management of terrain dataset in view field was implemented effectively by visible detection based on the simplified view frustum and terrain data prediction strategy.

此外,简化视见体的可见性判断和数据预取策略,实现可见数据的动态管理。

To calculate numerically the radiation of a enclosure within a heteromorphosis cavity, attention was focused on: how to decide the visibility between two surfaces, how to improve the old method of configuration factor computation, how to approximately and efficiently decide the radiation resource of directional, spectral radiation in cavity.

讨论了解决异型封闭腔辐射几何学问题的几种方法:异型封闭腔内,表面间可见性的判断方法;优化异型封闭腔角系数计算的方法;确定异型封闭腔内定向辐射的壁面辐射源的方法。计算了两种结构喷管封闭腔内的角系数,并从角系数的互换性和完整性定理验证了方法的正确性和有效性,为异型封闭腔的辐射计算解决了几何问

The experimental results show that the imperceptibility and robustness of these methods can be guaranteed.

实验结果表明,算法都具有良好的鲁棒性和不可见性

Experimental results show that our scheme makes a better tradeoff between imperceptibility and robustness, and is secure.

实验结果证明,本算法具有较好的鲁棒性、安全性和不可见性,特别是抗几何攻击效果尤其明显。

Containing the Visible Region positioning and the Sequence Region positioning raised in this paper as well as the Orientation Region positioning raised by Levitt [17] , the qualitative positioning method segments the environment of robot into different equivalent classes , and describes the positions without coordinates but just using landmarks and landmark relations, based on the extracted qualitative relations from images such as the visibility of landmarks, the sequence of landmarks and the position relative to the landmark pair boundary .

定性定位包括本文首次提出的可见区域定位和顺序区域定位,以及Levitt[17]提出的有向区域定位,利用通过图像获取的路标的定性关系如路标的可见性,路标排列的顺序和相对于路标对边界的位置等,将机器人的运动环境划分为若干个等价类;其定性性体现在不必使用坐标就可描述机器人的位置,这种定位方法只利用视觉反馈中的定性信息。

Based on recent based on precomputed radiance transfer techniques, this paper proposes a novel method for real-time editing object material under complex environment lighting. First, we precompute the visibility for each vertex as a precomputation stage; Next, at rendering stage, we on-the-fly compute bidirectional reflectance distribution function. Finally, we render the object material by looking up visibility of each vertex.

为了在环境光下对模型表面的材质进行实时编辑,提出一种基于预计算辐射传输的算法:首先预计算环境光相对于模型表面每一个顶点的可见性;然后在绘制时实时计算物体表面的双向反射分布函数;最后通过查找环境光相对于模型表面每一个顶点的可见性,快速绘制出物体表面材质。

Exibility for point sampling. Secondly, by combining the splat-ting algorithm with Layered Depth Buffers, we implement an algorithm fordetermining the points'visibilities and re?ectance properties, which is more accuratethan pervious methods.

其改进之处包括两点:一方面,根据灭点的性质,设计出等间隔索引表的结构来组织采样图像中物体的轮廓边,有效地提高了点采样的效率;另一方面,通过将splatting绘制算法和层次深度缓存的数据结构相结合,提出了一种高精度的点云可见性判断算法,从而克服了已有方法存在可见性判断误差的缺点。

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