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虚拟摄像机的生成是虚拟广告系统中一项关键技术,提出一种静止虚拟摄像机生成方法。首先,在视频图像中自动检测比赛场地的特征点,然后根据特征点在图像坐标系与世界坐标系上的匹配关系,利用摄像机定标技术计算出真实摄像机的内外参数,接着把摄像机的内参数和外参数分别转换为虚拟摄像机的视点转换矩阵和投影矩阵,最后在此虚拟摄像机下对虚拟场景进行渲染,把渲染出的图像插入到视频中。实验结果表明该方法简单、有效、易实现。 相似文献
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曹惠龙 《数字社区&智能家居》2009,(11)
随着数字视频技术的发展,虚拟现实技术越来越受到更多的关注,利用现代计算机、实时数字信号处理、图像处理(包括图像生成、识别、跟踪和融合)等高新技术,研制基于三维虚拟体与实景视频的无缝融合处理平台。该系统通过对实景视频图像的实时识别跟踪,将人物、计算机产生的虚拟物融入摄像机拍摄的实景现场之中,从而达到真实视频图像与虚拟生成景象完美结合的显示效果。 相似文献
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陈旭亮 《计算机技术与发展》2012,22(6)
3D应用已经成为趋势,各种3D技术得到广泛的应用,许多3D应用都用到了3D虚拟摄像机.文中主要对3D虚拟摄像机进行了研究,通过调节3D摄像机来调节3D场景的渲染视角,这里主要研究的是通过3D摄像机的平移和旋转来调节渲染视角.由于对于不同的场景,场景的大小不同,场景中3D摄像机的位置和状态也不同,所以需要一种方法,能够对于用户的同一操作,根据不同场景,计算出相应的变换参数来操作3D摄像机.文中找到了一种调节3D摄像机的方法,该方法主要利用变换矩阵和几何关系来计算相应的变换参数,能够根据用户的操作自动计算相应参数来改变3D场景中虚拟摄像机的位置和状态,对3D摄像机进行调节,从而改变渲染视角,使交互更加方便. 相似文献
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阐述了一种主要用于检测视频同步信号的基于PCI总线的视频发生器模块的设计过程。该模块具有RS-422总线接口与两路PAL制式复合视频输出端。该视频信号可以由外部行场同步与外部复合同步来同步,也可以由内部时钟生成的内同步信号同步。视频图象数据由板上的存储器存储,并可以通过接口改写。本硬件电路板还可以通过PC机对同步的选择与图象的发送进行控制,并具有故障检测的功能。其中的视频同步信号生成电路以及视频图像数据地址生成电路采用了PLD器件.这样就可以很方便地去改变视频制式,也便于调试。 相似文献
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视频监控系统是数字化时代的最新发展趋势,而远程视频传输是其主要研究内容。文章以某制造业的工业现场为视频监控系统的研究背景,以C#为其开发环境,通过现场上位机将采集到的海康摄像机视频信息通过套接字发送到远程服务器上的数据库中,实现远程视频传输。远程客户端通过调用WCF中的函数来获得远程服务器数据库中的视频数据,实现视频实时显示。现场上位机再建立一个套接字,用来与远程客户端进行XML传输标志位,实现远程控制摄像机,达到了视频监控的功能。实施结果证明该技术可以方便灵活地实现多工业现场下位机—服务器—多客户机的视频监控系统搭建,并且可以保证数据传输的完整性和可靠性。 相似文献
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基于自由立体视频的露天开采虚拟现实的研究与实现 总被引:1,自引:0,他引:1
文章结合最新的交互式自由立体视频技术与露天开采虚拟现实技术,设计并实现了一种基于自由立体视频的露天矿开采虚拟现实技术的交互与演示系统。文章利用3DS Max和VRMap软件建立了某露天矿区的虚拟视觉模型,并将这些虚拟视觉模型按照适合立体显示的条件进行场景渲染和视频图象生成,最后结合虚拟场景的三维显示特性设计了交互式自由立体视频软件,通过该软件展示了虚拟现实场景。该系统克服了传统虚拟现实演示的局限性,用较低的成本支持更多的用户进行参与和交互,同时也具有较强的环境拓展性。 相似文献
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Calibration-free augmented reality in perspective 总被引:3,自引:0,他引:3
Yongduek Seo Ki Sang Hong 《IEEE transactions on visualization and computer graphics》2000,6(4):346-359
This paper deals with video-based augmented reality and proposes an algorithm for augmenting a real video sequence with views of graphics objects without metric calibration of the video camera by representing the motion of the video camera in projective space. A virtual camera, by which views of graphics objects are generated, is attached to a real camera by specifying image locations of the world coordinate system of the virtual world. The virtual camera is decomposed into calibration and motion components in order to make full use of graphics tools. The projective motion of the real camera recovered from image matches has the function of transferring the virtual camera and makes the virtual camera move according to the motion of the real camera. The virtual camera also follows the change of the internal parameters of the real camera. This paper shows the theoretical and experimental results of our application of nonmetric vision to augmented reality 相似文献
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增强现实技术是近年来人机交互领域的研究热点。在增强现实环境下加入触觉感知,可使用户在真实场景中看到并感知到虚拟对象。为了实现增强现实环境下与虚拟对象之间更加自然的交互,提出一种视触觉融合的三维注册方法。基于图像视觉技术获得三维注册矩阵;借助空间转换关系求解出触觉空间与图像空间的转换关系;结合两者与摄像头空间的关系实现视触觉融合的增强现实交互场景。为验证该方法的有效性,设计了一个基于视触觉增强现实的组装机器人项目。用户可触摸并移动真实环境中的机器人零件,还能在触摸时感受到反馈力,使交互更具真实感。 相似文献
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Yijiang Zhang Julien Pettr Jan Ondej Xueying Qin Qunsheng Peng Stphane Donikian 《Computer Animation and Virtual Worlds》2011,22(6):499-510
The seamless integration of virtual characters into dynamic scenes captured by video is a challenging problem. In order to achieve consistent composite results, both the virtual and real characters must share the same geometrical constraints and their interactions must follow some common sense. One essential question is how to detect the motion of real objects—such as real characters moving in the video—and how to steer virtual characters accordingly to avoid unrealistic collisions. We propose an online solution. First, by analysis of the input video, the motion states of the real pedestrians are recovered into a common world 3D coordinate system. Meanwhile, a simplified accuracy measurement is defined to represent the confidence of the motion estimate. Then, under the constraints imposed by the real dynamic objects, the motion of virtual characters are accommodated by a uniform steering model. The final step is to merge virtual objects back to the real video scene by taking into account visibility and occlusion constraints between real foreground objects and virtual ones. Several examples demonstrate the efficiency of the proposed algorithm. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
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In applications of augmented reality like virtual studio TV production, multisite video conference applications using a virtual meeting room and synthetic/natural hybrid coding according to the new ISO/MPEG-4 standard, a synthetic scene is mixed into a natural scene to generate a synthetic/natural hybrid image sequence. For realism, the illumination in both scenes should be identical. In this paper, the illumination of the natural scene is estimated automatically and applied to the synthetic scene. The natural scenes are restricted to scenes with nonoccluding, simple, moving, mainly rigid objects. For illumination estimation, these natural objects are automatically segmented in the natural image sequence and three-dimensionally (3-D) modeled using ellipsoid-like models. The 3-D shape, 3-D motion, and the displaced frame difference between two succeeding images are evaluated to estimate three illumination parameters. The parameters describe a distant point light source and ambient light. Using the estimated illumination parameters, the synthetic scene is rendered and mixed to the natural image sequence. Experimental results with a moving virtual object mixed into real video telephone sequences show that the virtual object appears naturally having the same shading and shadows as the real objects. Further, shading and shadow allows the viewer to understand the motion trajectory of the objects much better 相似文献
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Chheang Vuthea Jeong Sangkwon Lee Gookhwan Ha Jong-Sung Yoo Kwan-Hee 《The Journal of supercomputing》2020,76(7):5655-5677
The Journal of Supercomputing - This paper is concerned with techniques for directly embedding moving objects in the real world into 360° virtual reality scenes captured by 360° camera,... 相似文献
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HVS:一种基于实景图象的虚拟现实系统 总被引:14,自引:4,他引:10
大多数的虚拟现实比试在于计算机图形技术,先由多边形构造虚拟场景的三维几何模型,再由计算机根据用户的观察点和观察方向实时绘制出用户所看到的虚拟场景,HVS 另一种思路,由计算机自动拉接、变形与组织许多幅度散的实景图象或连续视频,生成虚拟场景,这种虚拟场人有照片质量的视觉效果,被我们称为虚拟实景空间,虚拟实时空间能为用户提供、后退、仰视、俯视、360度环境、近看、远看等漫游能力,运行它不需要高性能的图 相似文献