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《计算机应用与软件》2017,(1)
针对三维人体模型结构复杂,处理数量大且不易提取控制点等问题,提出通过对人体形状进行特征分析描述人体结构并进行姿态识别的算法。融合测地线与空间结构等特征提取骨架点有效减少数据的计算量,并通过ICP算法进行姿态的行为识别。实验证明,该算法有效地提升了三维姿态的识别效率,并有很好的鲁棒性。 相似文献
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本文采用了一种基于AKAZE特征检测和PnP算法的单目视觉测量方法对相机的相对姿态进行解算,用于快速准确地确定空间中两个目标间的位姿关系.采集合作目标的模板图像,提取附加到合作目标上的4个特征点的像素坐标,利用AKAZE关键点对模板图像和待测图像进行匹配并计算映射矩阵,通过映射矩阵得到4个特征点在待测图像中的像素坐标,然后结合合作目标的尺寸信息求解基于4个共面特征点的PnP问题,解算相机与合作目标的相对位置.实验分析表明该方法计算的实时图像相机位姿与真实结果接近,验证了本文方法的有效性. 相似文献
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提出一种在图像投影匹配基础上进行的目标姿态测量新方法,避免了传统姿态测量中左右像面目标的特征匹配或灰度匹配.二维投影相关法是基于二维投影的灰度相关匹配算法,主要利用匹配图像相邻像素的灰度值的大小关系应该相同的原理进行图像匹配.在此基础上采用双目视觉测量空间轴对称目标姿态,应用面面交会法获取轴对称目标在像面的轴线,进行三维姿态测量.模拟实验结果表明:该方法姿态角测量误差小于0.2°;且计算速度快,结果稳定,能够满足处理的要求. 相似文献
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针对当前武术标准动作训练的需要,为提高武术训练的准确度,结合当前流行的三维图像采集技术,提出一种基于Kinect的动作识别技术.最后通过试验验证了基于Kinect在太极拳姿态采集方面的可行性,并且本文设计的姿态匹配方法,具有较高的识别率. 相似文献
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针对传统舞蹈动作捕捉和自动识别准确率低的问题,设计一个基于动作捕捉传感器的民族舞蹈动作自动识别系统。系统通过构建人体动作数据库,为人体关节动作模型提供数据参考,利用传感器读取数据后,将读取数据置入三维人体动作模型中,将其与数据库中的标准动作进行匹配,找出舞蹈训练者的错误动作并进行纠正,以此实现舞蹈动作自动识别。测试结果表明,对比于其他动作识别系统,本系统在动作识别角度和关节点定位方面与Kinect标准值间的误差最小,识别准确率高达97.6%,综合分析可知,本系统可实现民族舞蹈动作的精准捕捉和自动识别,具有一定的有效性。 相似文献
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针对危险驾驶行为引起的交通安全事故频发的现状,提出一种基于MobileNetV3和ST-SRU的危险驾驶姿态识别系统.首先,修改MobileNetV3的网络结构使其适用于人体姿态估计任务,输出关节点的热力图和偏移量图,用来估计J个关节点的二维坐标位置;其次,定义ST-SRU骨架动作识别算法,利用动作的骨架序列数据对动作进行分类.实验结果表明:MobileNetV3姿态估计算法在自建的AI Challenger上肢姿态数据集上测得PCP值(percentage correct parts)达到95.6%,测试1 000次用时仅为5.03 s;利用自建的危险驾驶行为数据集将训练好的姿态估计和动作识别模型移植到嵌入式平台,实现了实时的危险驾驶姿态识别系统. 相似文献
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针对传统惯性导航累积误差大的缺陷,研究提出了一种视觉导航姿态估计方法;首先提取图像的局部特征,分别对SURF(speeded up robust features)、SIFT (scale-invariant featuretransform)及GPU-SIFT特征提取算法进行了比较;保证算法精度及实时性后,将实时图与基准图库进行局部特征匹配,并利用EPnP算法进行飞行器的六自由度参数解算;实验结果表明GPU-SIFT算法精度最高,且随着图像分辨率的提高,其计算速度相比SURF和SIFT算法有了显著提高,该方法在一定条件下具有较高的位姿精度和良好的实时性. 相似文献
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Motion capture data digitally represent human movements by sequences of body configurations in time. Subsequence searching in long sequences of such spatio-temporal data is difficult as query-relevant motions can vary in execution speeds and styles and can occur anywhere in a very long data sequence. To deal with these problems, we employ a fast and effective similarity measure that is elastic. The property of elasticity enables matching of two overlapping but slightly misaligned subsequences with a high confidence. Based on the elasticity, the long data sequence is partitioned into overlapping segments that are organized in multiple levels. The number of levels and sizes of overlaps are optimized to generate a modest number of segments while being able to trace an arbitrary query. In a retrieval phase, a query is always represented as a single segment and fast matched against segments within a relevant level without any costly post-processing. Moreover, visiting adjacent levels makes possible subsequence searching of time-warped (i.e., faster or slower executed) queries. To efficiently search on a large scale, segment features can be binarized and segmentation levels independently indexed. We experimentally demonstrate effectiveness and efficiency of the proposed approach for subsequence searching on a real-life dataset. 相似文献
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针对大范围室外场景和具有重复、高频纹理特征(例如水泥地、草坪)的场景,提出了一种鲁棒性强、定位精度高、速度更快的视觉定位算法。采用8级图像金字塔的ORB (Oriented FAST and Rotated BRIEF)特征描述子提取图像特征点,通过K近邻(KNN)匹配相邻图像序列的特征点对,依次解算基础矩阵F和本质矩阵E,采用自适应法利用单应矩阵和本质矩阵进行位姿估计,最后解算两帧图像间相机刚体运动的旋转R和平移t,利用三角测量法则求解出匹配点的三维坐标,重建相机运动轨迹。为了提高算法性能,提出采用最小化基于点特征的非线性重投影误差优化三维点。通过调用OpenCV在C++中实现,对所采集的数据集进行测试,测试结果表明,该方法比传统的3D位姿估计更优,实时可行。由于其基于单目而实现,因此无法得到尺度信息。 相似文献
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随着仿真和虚拟现实技术的发展,虚拟人技术由理论研究逐渐走向实际应用,在医学、军事、航天、体育、艺术等领域发挥越来越重要的作用.然而,由于人体外形和运动的复杂性,对人类自身完美地模拟还十分困难.以队列训练模拟器为背景,重点研究了系统中虚拟人的几何和运动控制建模.根据军事队列训练的目标和要求,采用分层虚拟人表示方法,建立了具有树形结构的人体几何模型;应用基于视频的运动捕捉技术和运动学方法,控制虚拟人的行为动作;以齐步走为例,给出了仿真结果.仿真和实验结果表明,所建立的人体几何模型逼真可信,基于视频的运动捕捉和运动学结合的运动控制方法有效、逼真地对虚拟人进行了控制. 相似文献
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In this paper, we aim for the recognition of a set of dance gestures from contemporary ballet. Our input data are motion trajectories
followed by the joints of a dancing body provided by a motion-capture system. It is obvious that direct use of the original
signals is unreliable and expensive. Therefore, we propose a suitable tool for non-uniform sub-sampling of spatiotemporal
signals. The key to our approach is the use of a deformable model to provide a compact and efficient representation of motion
trajectories. Our dance gesture recognition method involves a set of hidden Markov models (HMMs), each of them being related
to a motion trajectory followed by the joints. The recognition of such movements is then achieved by matching the resulting
gesture models with the input data via HMMs. We have validated our recognition system on 12 fundamental movements from contemporary
ballet performed by four dancers.
This revised version was published online in November 2004 with corrections to the section numbers.
Ballet Atlantique Régine Chopinot. 相似文献
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Ronan Boulic Javier Varona Luis Unzueta Manuel Peinado Angel Suescun Francisco Perales 《Virtual Reality》2006,10(1):48-61
Despite its central role in the constitution of a truly enactive interface, 3D interaction through human full body movement has been hindered by a number of technological and algorithmic factors. Let us mention the cumbersome magnetic equipments, or the underdetermined data set provided by less invasive video-based approaches. In the present paper, we explore the recovery of the full body posture of a standing subject in front of a stereo camera system. The 3D position of the hands, the head and the center of the trunk segment are extracted in real-time and provided to the body posture recovery algorithmic layer. We focus on the comparison between numeric and analytic inverse kinematics approaches in terms of performances and overall quality of the reconstructed body posture. Algorithmic issues arise from the very partial and noisy input and the singularity of the human standing posture. Despite stability concerns, results confirm the pertinence of this approach in this demanding context. 相似文献
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Lixin FanAuthor Vitae Kah-Kay SungAuthor VitaeTeck-Khim NgAuthor Vitae 《Pattern recognition》2003,36(4):1019-1029
This paper introduces a human body contour registration method for static pedestrian images with unconstrained backgrounds. By using a statistical compound model to impose structural and textural constraints on valid pedestrian appearances, the matching process is robust to image clutter. Experimental results show that the proposed method register pedestrian contours in complex backgrounds effectively. 相似文献
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Motion phase plays an important role in the spatial–temporal parameters of human motion analysis. Multi-sensor fusion technology based on inertial sensors frees the monitoring of the human body phase from space constraints and improves the flexibility of the system. However, human phase segmentation methods usually rely on the determination of the positioning of the sensor and the number of sensors, it is difficult to artificially select the number and position of the sensors, especially when human motion phases are diverse. This paper proposes a selection framework for the sensor combination feature subset for motion phase segmentation, which combines feature selection algorithms with the subsequent classifiers, and determine the optimum combination of the sensor and the feature subset according to the performance of the trained model. Through the constraint and the sensor combination feature subset (SCFS), the filter method can select any number of sensors and control the size of the feature subset; the embedded method can select any number of sensors, but the size of the feature subset is determined by the classifier model. Experimental results show that the proposed framework can effectively select a specified number of sensors without human intervention, and the number of sensors has an impact on the recognition rate of the classifier within 1.5%. In addition, the filter method has good adaptability to a variety of classifiers, and the classifier prediction time can be controlled by setting the subset size of the feature; the embedded method can achieve a better phase segmentation effect than the filter method. For the application of motion phase segmentation, the proposed framework can reliably and quickly identify redundant sensors that provide effective support for reducing the complexity of the wearable sensor system and improving user comfort. 相似文献
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快速运动和自遮挡是人体运动跟踪的难点所在 .为此提出了一种采用弱预测机制的人体运动跟踪算法 .该算法首先通过全局搜索 ,确定候选人体特征集 ;然后建立特征的色彩、运动等属性的时变模型 ,构造贝叶斯分类器 ,实现特征对应 ;最后根据人体特征层次模型 ,检验特征匹配 ,并实现被遮挡特征的定位 .为提高跟踪效率 ,采用了基于图象多分辨率表示的特征搜索算法 ,由低分辨率图象通过全局搜索来获取初始候选特征集 ,然后在高分辨率下 ,不断改善候选特征精度 .实验结果表明 ,该算法能实现对快速人体运动的跟踪并有效解决自遮挡问题 . 相似文献