基于主动网格的运动补偿

提出了基于图像内容特征的主动网格生成方法和网格节点运动估计方法，网格的边界与运动场景的边界有很好的一致性，避免了相同三角形小片内存在不同的运动物体，克服这种情况下运动估计失效的问题。块匹配的运动补偿方法的缺陷在于块效应，基于主动网格的运动补偿消除了块效应和边界不连续现象，运动场的估计与实际运动场有很好的近似，对局部运动也有更好的逼近。     

一种便于硬件实现的消锯齿的视频处理方法

文章是针对在隔行到逐行转换过程中产生的运动虚像和锯齿现象,先提出常用的消运动虚像和锯齿的方法,如基于边缘检测的3×3窗口滤波方法、基于运动检测的滤波方法,接着提出一种便于硬件实现的四方向中值滤波取最大值法,该方法除了硬件实现简单、消锯齿效果好,而且具有降噪和保持图像细节的功能。     

基于H.263的实时视频编码技术研究

为了提高H．263编码技术现有算法的执行效率，本文提出了一种基于时域预测的预判零方法，该方法在保证一定图像质量的条件下具有较高的判别效率，能节约大量的编码时间：并在此基础上结合“钻石”运动搜索算法、MMX优化技术，实现了利用软件进行实时视频编码。     

On the strategic origin of Brownian motion in finance

This paper is concerned with the strategic use of a private information on the stock market. A repeated auction model is used to analyze the evolution of the price system on a market with asymmetric information.  The model turns out to be a zero-sum repeated game with one-sided information, as introduced by Aumann and Maschler.  The stochastic evolution of the price system can be explicitly computed in the n times repeated case. As n grows to ∞, this process tends to a continuous time martingale related to a Brownian Motion.  This paper provides in this way an endogenous justification for the appearance of Brownian Motion in Finance theory. Received: February 2002     

One-dimensional free boundary problem for actin-based propulsion of Listeria

Some bacteria move inside cells by recruiting the actin filaments of the host cells. The filaments are polymerized at the back surface of the bacteria, and they move away, forming a “comet” tail behind the bacterium, which consists of gel network. We develop a one-dimensional mathematical model of the gel based on partial differential equations which involve the number of filaments, the density and velocity of the gel, and the pressure. The two end-points of the gel form two free boundaries. The resulting free boundary problem is rather non-standard. We prove local existence and uniqueness.     

聚变堆遥操作上层协同控制系统设计和测试

为了解决聚变堆遥操作维护上层控制系统普遍存在的软件功能模块过于集中、拓展性差、不具备中层运动规划能力等问题,设计了一种基于机器人操作系统(ROS)的上层协同控制系统。该系统采用分布式架构,基于市场成熟的开发平台进行设计,集成了中层运动规划与动力学虚拟仿真功能。通过“轴销抓取”的实验场景测试的结果表明：该系统满足设计需求,运行稳定。     

Spatial-based iterative learning control for motion control applications

For many motion control applications spatial constraints are often more important than temporal constraints. In recent work, we have developed a spatial control strategy called the ε-controller for mobile robot applications. The control strategy is based solely on static path geometry with position (in space) feedback. Motivated by this idea, in this paper, we consider the notion of spatial-based iterative learning control (ILC). Specifically, we consider repetitive operation problems where corrections are made to the control signal from trial to trial. Unlike traditional ILC, however, which updates control signals based on the time elapsed along a trajectory, we instead make updates based on path errors and progress along the path. The idea is demonstrated via simulation for a system with bang–bang velocity control. Experimental results using a high-precision, two-axis gimbal mechanism are presented to show the effectiveness of the strategy.     

平板显示器运动图像清晰度客观测试技术的研究

本文提出了一种基于高速相机和时域空域解耦人眼视觉系统模型的新型运动图像清晰度客观测试方法,具有采用静态、动态一致的显示线作为评价参数,更完善的人眼视觉系统算法,基于调制度的客观测试能力等优点。本文采用高速相机、瞬态光度计、视频发生器实现了测试系统的原理性试验装置,并研制了软件验证算法。核心算法与测试序列已得到国家发明专利授权并得到系统试验验证。     

基于图像运动检测的子场编码优化算法

针对等离子显示器中运动图像产生的动态伪轮廓现象,提出了一种基于图像运动检测的子场编码优化算法。该算法在分析常用动态伪轮廓和运动补偿算法的基础上,通过检测图像数据的变化差值判断图像的运动状态,并通过图像运动状态选择不同的显示灰度构成方式:静态图像选择全灰度级编码,动态图像选择较少灰度级编码,通过优化编码方式消除图像的动态伪轮廓。实验表明,算法减少了不同运动速度的图像因算法引起的人工纹理,保证了静态图像的显示细节,达到改善显示图像画质的目的。此外,该算法还具有处理速度快,易于硬件实现等优点。     

一种改进的三维递归搜索帧率上转换算法

提出了一种改进的三维递归搜索(3-Dimension Recursive Search,3DRS)帧率上转换算法。相较于3DRS算法,在3个方面提出改进:首先,调整候选运动矢量的选择,充分利用运动失量的空间相关性;其次,增加一次逆序运动估计,加速运动失量收敛;最后,提出一种新的匹配准则以进一步提高运动估计的准确性。实验结果表明,该算法有效提高了运动估计的准确性,所得结果在主客观均取得较好的效果。