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1.
该文提出了一种用于MPEG-4形状编码的快速运动估计算法.该算法利用了形状编码及形状信息的固有特性,即基于上下文的运动估计特性,相邻二值alpha块的运动矢量相关性以及形状信息的二值特性.模拟结果表明。该算法具有运算量少,处理速度快的特点,适用于MPEG-4形状编码的实时软件实现.  相似文献   

2.
近几年,在智能监控系统中,广泛应用了基于生物视觉原理的运动目标检测与跟踪计算模型。这里提出一种基于神经轴突延迟机制,利用脉冲神经元网络模型对运动目标进行检测与跟踪的算法,该神经网络模型是利用轴突延迟脉冲神经网络模拟人类的视觉特性,从而提取运动目标,并具体分析脉冲神经元网络算法的实际意义。实验结果表明,该算法能够动态并行地进行运动目标提取,可通过硬件实现而应用于监控系统中。  相似文献   

3.
邹庆揆  黄毅 《信息技术》2005,29(9):127-131
首先介绍了视频压缩系统,并在此基础上阐述了运动估计块匹配算法,分别介绍了块匹配的基本原理、提高运动估计效率的几个关键技术,分析了传统的基于块的运动估计块匹配算法和后来改进的匹配算法的性能,同时在分析MPEG-4特性的基础上,阐述了未来的运动估计匹配算法的发展趋势。  相似文献   

4.
基于OpenCV的红外弱小运动目标检测与跟踪   总被引:2,自引:0,他引:2       下载免费PDF全文
针对信噪比低、背景和噪声干扰严重的红外图像,根据图像序列中运动目标的帧间相关特性以及噪声的不相关理论,基于OpenCV(Open Soure Computer Vision Library)计算机视觉库,提出了一种弱小目标的检测算法,并对检测到的目标进行了跟踪。采用能量累积的方法得到背景,然后从原始图像中去除背景,提高信噪比;利用目标的帧间相关特性以及运动信息去除噪声;最后通过Kalman滤波算法来对检测到的目标进行跟踪。实验结果表明:该检测算法能有效地从序列图像中提取出弱小运动目标,跟踪算法也能实时地进行跟踪并在目标被遮挡时准确地预测出目标位置。  相似文献   

5.
研究了运动条件下光子计数激光测距系统的探测机制,分析了该系统在数据处理中涉及到的回波光子信号的统计特性、探测概率等理论问题。针对运动条件下的测距背景,根据该系统的回波信号特点,基于Matlab产生了符合统计分布规律的包含目标回波和噪声回波的仿真信号。在对泊松滤波算法等传统数据处理算法进行研究的基础上,提出了一种改进的基于栅格滤波的算法,并利用该算法对仿真回波数据进行了处理,最终有效滤除了随机分布于整个探测空间的噪声信号,获得了目标的运动轨迹。与传统的数据处理算法相比,该算法对运动条件下的光子计数激光测距数据具有良好的处理效果。  相似文献   

6.
扼要介绍了UKF和CKF滤波算法,分析总结了两种滤波算法的异同,并基于蒙特卡罗仿真试验,对大方位失准角情形下UKF滤波算法和CKF滤波算法的应用特性进行了对比、分析和总结,指出了UKF滤波算法对角运动和线运动均敏感,角运动和线运动方向的激励均可以加速其收敛,而CKF滤波算法对角运动不敏感,但对线运动敏感,角运动方向的激励无助于其对准精度的提高,而线运动方向的激励可加速其收敛,且收敛精度随激励效果的加强而提高的特性,为该种情形下对准技术的工程化实现提供了针对性建议。  相似文献   

7.
讨论了传统的4:3格式的标准清晰度电视信号转换为16:9格式的高清晰度电视信号的运动自适应的非均匀比率扩展变换算法,算法结合视频图像的运动检测,采用K-均值聚类法,根据图像的运动重心(motion center of gravity-MCOG)选择合适的扩展比率,并针对不同的图像区域进行扩展变换,算法符合人的视觉系统对图像的运动区域具有较强感知度的视觉特性,有效的减小了视频格式转换的图像变形,实验表明了本文提出算法的有效性。  相似文献   

8.
本文提出了一种用于MPEG2运动估计的八步搜索算法(8SS),它的搜索位移为(-16,+15.5)。该算法由于利用了序列图象运动矢量的空间分布特性—中心偏置分布特性,可以明显地将搜索次数降低到(25-55)次。仿真表明这种算法减少了搜索范围和搜索次数,提高了搜索效率,并能给出更正确的运动矢量。本文还对几种不同的搜索算法在大范围搜索区域的性能进行了详细的比较。  相似文献   

9.
利用增强位平面的二值特性和运动矢量场自适应思想,提出了一种新的自适应二值运动估计算法.算法在图像的位平面中完成运动矢量的搜索;匹配时对静止块进行判定直接中止搜索,同时采用了起始点预测和运动类型判定,自适应使用LDSP和SDSP模板进行搜索.实验结果表明:该算法的搜索速度优于绝大多数现有的运动估计算法,且预测精度接近于FS算法.  相似文献   

10.
运动估计在视频压缩中占有相当重要的地位。本文设计了一种自适应的六边形一方形运动估计搜索算法,该算法根据实际视频序列的统计特性,充分利用搜索起始点预测技术,中止判别技术,以及零运动向量的判决技术,有效提高了运动估计的搜索精度。最后给出了仿真比较结果,以证明本文算法的有效性。  相似文献   

11.
当前,动画及其实现技术受到业界广泛关注,而人脸动画如喜、怒、哀、乐的表达其真实感还不够好.以Waters肌肉模型为基础,提出NURBS弹性肌肉模型,该方法依据解剖学知识,用非均匀有理B样条曲线仿真肌肉.通过改变曲线控制点的权重,可以找到一个动作向量控制肌肉的运动,进而合成人脸的各种表情.控制点数量越多,肌肉就越好控制,那么就可以更加真实地仿真人脸表情.  相似文献   

12.
将拉普拉斯变换用于空间变量x,使一维波动的分布参数系统模型变换为以时间为独立变量的常微分方程系统。同时将边界控制变换为状态控制。然后用常微分方程系统的已知理论结果对可控性、可观测性和稳定性做了判定。这是对一维波动的分布参数系统的一种简化处理方法。  相似文献   

13.
Mankyu Sung 《ETRI Journal》2013,35(6):1029-1037
This paper introduces a novel and fast synthesizing method for 3D motions of quadrupedal animals that uses only a small set of motion capture data. Unlike human motions, animal motions are relatively difficult to capture. Also, it is a challenge to synthesize continuously changing animal motions in real time because animals have various gait types according to their speed. The algorithm proposed herein, however, is able to synthesize continuously varying motions with proper limb configuration by using only one single cyclic animal motion per gait type based on the biologically driven Froude number. During the synthesis process, each gait type is automatically determined by its speed parameter, and the transition motions, which have not been entered as input, are synthesized accordingly by the optimized asynchronous motion blending technique. At the start time, given the user's control input, the motion path and spinal joints for turning are adjusted first and then the motion is stitched at any speed with proper transition motions to synthesize a long stream of motions.  相似文献   

14.
The use of video capsules for noninvasive explorations of the digestive tube is progressively increasing today. At present, the motion of these wireless endoscopic devices cannot be controlled and they proceed by means of visceral peristalsis and gravity. Aimed at enabling a motion control, the technique described here uses an external magnetic field applied to the video capsule, previously coated with a magnetic shell. As a source of controlled magnetic field, a robotic magnetic navigation system, recently introduced in the clinical practice to magnetically steer cardiovascular interventional devices, was suggested in a previous study to be deserving of investigation. The attractive potentialities of this system, along with its current limitations, in order to maneuver endoscopic capsules were studied in this work for the first time, both from a theoretical and an experimental point of view. The actual capabilities were experimentally assessed with preliminary motion control tests on a conventional video capsule inside a human-sized plastic phantom. Results demonstrated the possibility of achieving controlled magnetic maneuvers within the considered environment.   相似文献   

15.
Sooyeong Yi 《Mechatronics》2010,20(4):485-495
This paper proposes a gait planning and control algorithm for the quadruped robot pet commercialized by Dasarobot, Korea. Reliable motion and online characteristics are the key requisites for the motion planning algorithm of a commercialized robot. At joint control level of the proposed gait control, sample-based interpolation makes joint trajectory tractable for small motor and controller of the miniaturized robot. Centroid body sway ensures walking stability to achieve reliability of the proposed gaits at the motion planning level. By using ground coordinates representation, it is possible to integrate several online gaits and realize a compact and efficient gait planning algorithm. Experimental results are presented to verify the proposed gait planning and control algorithm.  相似文献   

16.
利用相邻两帧图像的运动信息更新特征块提取阈值,实时地提取出当前帧图像中最能体现背景运动特征的特征块。采用块匹配的运动估计方法获取了各块的运动矢量,再依据所有特征块运动矢量的统计特性提取出背景运动矢量来配准差分,实现了目标的检测。实验结果表明,此方法能有效地检测复杂背景下的运动目标。  相似文献   

17.
以RoboCup中型组足球机器人为实验平台,提出一种基于FPGA的全方位移动足球机器人运动控制系统的实现方法。首先分析和研究三轮全方位移动机器人的运动学特性,建立其运动控制模型,然后以FPGA为主要处理器,设计了PID速度闭环控制算法,实现了对机器人的精确控制。实验发现,该设计方法具有很好的实时性,能够对全方位移动机器人进行快速、准确的控制。  相似文献   

18.
概述了太阳能测试分选机的结构和基本原理,介绍了其运动控制的组成部分,用模块化和线程同步方式实现了整机运动,此方法亦可用于类似设备的运动控制设计。  相似文献   

19.
A motion control of mobile manipulator with external force   总被引:1,自引:0,他引:1  
Describes a stable motion control of a mobile manipulator with the consideration of external force. As is well known, the mobile manipulator has infinite motion area, which brings several sophisticated advantages to the manipulator control. However, the unexpected external force to the mobile manipulator makes its motion unstable since there are no fixed points in the stationary coordinate. To obtain the stable motion independently of the external force, the cooperative control of the manipulator and vehicle parts is strongly required. To address the above issue, the paper presents a stable control strategy for mobile manipulator in the case that an eternal force exists. The validity of the proposed method is confirmed by several experimental results  相似文献   

20.
Optimal Synchronization Control of High-Precision Motion Systems   总被引:4,自引:0,他引:4  
Recently, in the motion control area, one of the most challenging problems has been synchronization control of multiple motion axes or drivers. Unfortunately, the majority of the previous approaches have not fully addressed the synchronization problem when the system performs a complex motion. In this paper, a novel synchronized design of the high-precision motion control system is presented. The basic idea is to introduce the coupling and synchronization factors into the definition of the synchronization error. Then, a new quadratic performance index incorporating the synchronization errors of the multiple motion axes is introduced so that the resulting control law generates the cross-coupling control action, and as a consequence, improved tracking and synchronization performance can be obtained. The key to the success of the new design is to ensure that each motor tracks its desired trajectory while synchronizing motion with others. Computer simulations and real-time experiments on a servo system with two permanent-magnet linear motors demonstrate the effectiveness of the method.  相似文献   

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