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| 1 | Video motion stitching using trajectory and position similarities显示文摘Stitching motions in multiple videos into a single video scene is a challenging task in current video fusion and mosaicing research and film production. In this paper, we present a novel method of video motion stitching based on the similarities of trajectory and position of foreground objects. First, multiple video sequences are registered in a common reference frame, whereby we estimate the static and dynamic backgrounds, with the former responsible for distinguishing the foreground from the background and the static region from the dynamic region, and the latter functioning in mosaicing the warped input video sequences into a panoramic video. Accordingly, the motion similarity is calculated by reference to trajectory and position similarity, whereby the corresponding motion parts are extracted from multiple video sequences. Finally, using the corresponding motion parts, the foregrounds of different videos and dynamic backgrounds are fused into a single video scene through Poisson editing, with the motions involved being stitched together. Our major contributions are a framework of multiple video mosaicing based on motion similarity and a method of calculating motion similarity from the trajectory similarity and the position similarity. Experiments on everyday videos show that the agreement of trajectory and position similarities with the real motion similarity plays a decisive role in determining whether two motions can be stitched. We acquire satisfactory results for motion stitching and video mosaicing. | CHEN XiaoWu LI Qing LI Xin ZHAO QinPing | 2012 | Science China(Information Sciences)2012，55，3： | 4 |
| 2 | 扩展粒子系统实时绘制逼真的龙卷风显示文摘龙卷风模拟一直是计算机图形学的热点之一,龙卷风的漩涡控制以及交互性尤其具体有挑战性.首先,为使粒子系统的粒子旋转起来,引入漩涡场,使得粒子在漩涡场作用下产生旋转效果;其次,在龙卷风的最外层添加一层高速旋转的透明的刚体,借助碰撞检测算法,将龙卷风与大物体的交互转化为刚体和物体的交互;然后,在光线投射算法生成纹理数据之后,给纹理数据进行光晕、太阳光等处理,采用GPU并行加速机制提高模拟实时性,模拟出逼真绚丽实时的龙卷风;最后,设计多组龙卷风以及龙卷风的交互实验实例,完成不同形态龙卷风及其交互效果验证. | 吕梦雅 陶建新 唐勇 张思 | 2017 | 小型微型计算机系统2017，38，5： | 3 |
| 3 | 基于SNMP的数据采集框架显示文摘数据采集模块是对嵌入式网络设备进行监控和管理的基础,由于采集对象的复杂性和多样性,对数据采集框架的兼容性和扩展性提出了更高的要求.基于B/S模型、嵌入式Internet技术、网络管理技术、多线程技术、提出了一种远程Web数据采集管理模块,解决了数据采集模块兼容性和扩展性较差的问题,形成了通用性强、扩展性强、可移植性强的远程Web数据采集管理框架.该框架实现了采集协议可拓展、采集任务调度策略可拓展,对嵌入式网络设备的智能监控管理起到了重要作用. | 林川 王汉军 陈庚午 | 2016 | 计算机系统应用2016，25，5： | 1 |
| 4 | Simulation of free-surface flow using a boundless grid显示文摘Physically based fluid simulation in recent years has been successful for small-scale fluids such as liquid in a cubic cavity.However,for boundless free-surface flow of large scale and irregular area,there is a critical trade-off between simulation efficiency and accuracy because of the restriction of the traditional regular computational grids.This paper introduces boundless computational grids based on hierarchical runlength encoding to simulate large-scale free-surface flow.We first modeled the free-surface flow with a lattice Boltzmann method,and calculated the surface curvature in the update process.We then introduced an effective method with which to calculate the surface curvature according to the surface tension so that the surface detail was enhanced,and obtained the curvature of each surface effectively as it was extracted.Furthermore,we dynamically compressed and indexed the computational cells with the improved hierarchical run-length encoding algorithm,so that the grid expands dynamically according to the fluid flow and the computational resources used were proportional to the volume of the fluid.Finally fluids in different situations were simulated realistically.The proposed method makes the best of the computational resources to perform the simulation with high resolution,and dynamically allocates resources so that the fluid can expand in random directions without boundaries,which is suited to the simulation of large-scale visual scenes. | WANG ChangBo ZHANG Qiang KONG FanLong | 2013 | Science China(Information Sciences)2013，56，3： | 1 |
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