共查询到20条相似文献,搜索用时 359 毫秒
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论文提出一种用于AR系统中进行运动目标跟踪的点阵图像,并给出了提取这个点阵图像特征点的算法。目标物体跟踪系统在CCD实时采集的、包含被跟踪目标的场景图像中提取点阵图像的特征点,这些特征点的坐标作为计算目标运动状态提供必要的参数。该标志可以用在具有复杂背景的目标物体跟踪系统中。 相似文献
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针对重叠视域范围内多摄像头目标跟踪匹配问题,提出一种基于视野分界线的运动目标检测跟踪方法,通过Sift算法与Harris算法相融合对存在重叠视域范围的图像自动获取特征匹配点,利用所获特征匹配点对生成视野分界线,当目标通过分界线时,依据颜色信息的投影不变量方法,通过目标中心位置与视野分界线之间的距离来判断运动目标,进而实现运动目标的交接,完成后续动态目标的追踪.通过设置相同的视频帧数和实验场景与已有文献进行对比实验,所提算法对运动目标跟踪准确率分别为76%、87%、88%,均高于文献算法跟踪精度.实验结果表明所提出的算法能够实现多摄像头间的目标连续跟踪既能解决对同一运动目标的实时跟踪,又可以解决多视角协同重叠视域范围内的运动目标跟踪距离较近而导致运动目标丢失的问题,通有效提高目标跟踪的准确性,为多视角运动目标跟踪提供了一种新的解决方法. 相似文献
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提出一种基于候选区匹配的控制PTZ(Pan,Tilt,zoom)摄像头的目标跟踪方法.该方法将图像的中心区域或者检测的目标运动区域作为候选区对目标定位,并根据目标的预测位置计算摄像头运动参数,实现摄像头自动控制跟踪目标.采用对称差分来检测图像中的目标运动区域,利用颜色和纹理信息等特征来表示目标,通过相似性度量从候选区定位目标.同时考虑摄像头命令的传输和执行延时,利用目标运动轨迹对目标位置加以预测,并根据目标预测位置自动控制PTZ摄像头主动追踪目标.实验表明,该方法在较大区域内,以及瞬时遮挡条件下,能连续实时地主动追踪感兴趣目标. 相似文献
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就图像单个运动目标识别和跟踪问题提出了一种解决方案。在图像分割部分,提出了基于数学形态学中流域分割的实现方法,依据单运动目标的特征通过合并过渡分割区域算法较好地解决了过度分割的现象,实现无需人工设置任何阈值,全智能化图像分割;在目标提取部分,提出了一种在连续多帧图像中自动提取单运动目标的方法,能适应摄像头固定和摄像头随运动目标移动等各种情况;在目标跟踪部分,对进行匹配的模板设置掩码,并自动进行调整,使得对运动目标的跟踪更为鲁棒。 相似文献
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针对摄像机运动和场景光照突变的情况,提出了一种基于分块运动估计的对象跟踪算法。首先,对图像进行分块角点匹配,得到各块运动参数,然后对各块进行分块运动补偿和光照补偿;对补偿后的图像进行相邻帧差分得到目标的近似质心位置;跟踪过程则融合运动目标加权颜色直方图和梯度直方图作为目标特征,以所得质心为初始搜索点,采用螺旋搜索算法,进行目标模板和候选目标相似性检测,搜索最佳匹配点得到目标对象在当前帧的准确位置。实验结果表明,该算法能够有效克服光照剧烈变化,在动态背景下能达到对对象的准确跟踪。 相似文献
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针对室内外环境的动态特点,描述了一个可扩展的多摄像头实时监控系统,提出了新的基于非重叠多摄像头的运动目标跟踪方法.该方法利用亮度信息在单摄像头内检测和跟踪目标,结合运动目标的亮度特征和路径特征,在多摄像头内估计运动目标外形变化,并建立运动目标路径模型,使用融合算法实现基于非重叠多摄像头的目标跟踪.与其他监控系统相比,该系统不要求摄像头校准,在有亮度变化的非重叠多摄像头场景中能立即准确跟踪目标.实验证明,提出的方法有好的跟踪效果. 相似文献
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Automatic feature point extraction and tracking in image sequences for arbitrary camera motion 总被引:3,自引:0,他引:3
An automatic egomotion compensation based point correspondence algorithm is presented. A basic problem in autonomous navigation and motion estimation is automatically detecting and tracking features in consecutive frames, a challenging problem when camera motion is significant. In general, feature displacements between consecutive frames can be approximately decomposed into two components: (i) displacements due to camera motion which can be approximately compensated by image rotation, scaling, and translation; (ii) displacements due to object motion and/or perspective projection. In this paper, we introduce a two-step approach: First, the motion of the camera is compensated using a computational vision based image registration algorithm. Then consecutive frames are transformed to the same coordinate system and the feature correspondence problem is solved as though tracking moving objects for a stationary camera. Methods of subpixel accuracy feature matching, tracking and error analysis are introduced. The approach results in a robust and efficient algorithm. Results on several real image sequences are presented.The support of the Advanced Research Projects Agency (ARPA Order No. 8459) and the U.S. Army Engineer Topographic Laboratories under Contract DACA 76-92-C-0009 is gratefully acknowledged. 相似文献
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《Real》1998,4(1):21-40
This paper describes how image sequences taken by a moving video camera may be processed to detect and track moving objects against a moving background in real-time. The motion segmentation and shape tracking system is known as a scene segmenter establishing tracking, version 2 (ASSET-2). Motion is found by tracking image features, and segmentation is based on first-order (i.e. six-parameter) flow fields. Shape tracking is performed using two-dimensional radial map representations. The system runs in real-time, and is accurate and reliable. It requires no camera calibration and no knowledge of the camera's motion. 相似文献
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为了能够在视频监控、人机交互、视频会议等领域对人头部运动实施实时跟踪 ,给出了一种使用黑白摄像机对人平移或转身时的头部运动进行实时跟踪的方法 .该方法主要由基于块特征的跟踪和基于头部几何特征的校正两个步骤组成 .块特征跟踪算法仅利用图象低层信息而不依赖于目标的具体模型 ,可实现对头部自由运动的跟踪 .为解决块特征跟踪误差累积等原因造成的目标丢失问题 ,又采用了头部轮廓几何特征检验方法 ,根据跟踪窗口中头部轮廓位置的偏移来对块特征跟踪结果进行校正 .另外 ,为提高转身运动时相邻两帧图象的特征跟踪正确率 ,还引入圆柱模型来拟合头部 ,并在展开柱面内进行块特征选取和跟踪 .本文方法在 P 35 0微机上进行了实验 ,实验结果表明 ,系统能对长时间图象序列中人平移或转身时头部运动实施准确跟踪 .当跟踪窗口大小为12 0× 180 pixels,块特征数目为 80个时 ,系统的处理速度达到 30帧 /s 相似文献
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In this paper, we present new solutions for the problem of estimating the camera pose using particle filtering framework.
The proposed approach is suitable for real-time augmented reality (AR) applications in which the camera is held by the user.
This work demonstrates that particle filtering improve the robustness of the tracking comparing to existing approaches, such
as those based on the Kalman filter. We propose a tracking framework for both points and lines features, the particle filter
is used to compute the posterior density for the camera 3D motion parameters. We also analyze the sensitivity of our technique
when outliers are present in the match data. Outliers arise frequently due to incorrect correspondences which occur because
of either image noise or occlusion. Results from real data in an augmented reality setup are then presented, demonstrating
the efficiency and robustness of the proposed method. 相似文献
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Object tracking is an important task in computer vision that is essential for higher level vision applications such as surveillance systems, human-computer interaction, industrial control, smart compression of video, and robotics. Tracking, however, cannot be easily accomplished due to challenges such as real-time processing, occlusions, changes in intensity, abrupt motions, variety of objects, and mobile platforms. In this paper, we propose a new method to estimate and eliminate the camera motion in mobile platforms, and accordingly, we propose a set of optimal feature points for accurate tracking. Experimental results on different videos show that the proposed method estimates camera motion very well and eliminate its effect on tracking moving objects. And the use of optimal feature points results in a promising tracking. The proposed method in terms of accuracy and processing time has desirable results compared to the state-of-the-art methods. 相似文献
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主要阐述了三维视觉测量系统的软件设计及实现,包括4个部分:图像卡的二次开发、电移台运动控制、图像处理、摄像机标定;利用VC++实现了图像卡的二次开发和电移台运动的实时控制;利用MATLAB强大的矩阵运算能力,与VC++相结合,实现了图像处理和摄像机内外参数的标定;通过实验表明,本系统运行正常,为进一步研究三维视觉自标定、不标定理论和实现在线测量提供了一个好的平台。 相似文献