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非线性系统的状态估计问题是现代控制理论研究中不可或缺的一部分.提出一种基于扩展Kalman滤波的鲁棒融合状态估计算法,它是在已有的扩展Kalman滤波算法的基础上,通过引入CI状态融合来实现的.融合算法的引入能有效填补扩展Kalman滤波器在模型线性化时所带有的精度损失;CI融合算法因为避免了局部估计误差互协方差的计算而变得简单易行,尤其便于实际工程应用.仿真实验结果表明了所提出的多传感器非线性离散系统的CI融合状态估计算法可有效减少估计误差,具有一定的有效性和可行性. 相似文献
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针对视频中行人检测准确率低的问题,提出一种基于YOLO的视频行人检测研究方法。首先引入YOLOv5检测器,在YOLOv5的Neck部分融合注意力模块CBAM,加强对低层特征的提取,解决视频中行人运动模糊问题,提高行人检测精度;其次引入DeepSort算法,在视频行人数据集上进行训练,实现行人跟踪;最后在DeepSort算法实现行人跟踪后引入REID技术,有效纠正行人运动轨迹,解决行人位置信息出错问题。实验结果表明:所提方法较原始算法mAP@0.5提高了2.8%,mAP@0.5:0.95提高了5.4%。 相似文献
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《赤峰学院学报(自然科学版)》2017,(4)
随着计算机技术的飞速发展,视频图像处理技术得到了显著的提高.本文提出了一种基于计算机视觉的运动目标跟踪方法.在Marr的计算理论框架下,我们引入通过自下而上的视觉跟踪处理方法来进行运动目标跟踪,本文以车辆视频为例,选用Robert算子对车辆进行边缘检测,针对车辆在运动过程中大小和姿态变化的情况,提出了基于多关联模板匹配方法进行跟踪.实验表明本文的算法分离的精度增强,跟踪效果好,并且能很好地满足实时性. 相似文献
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研究了在空频块码正交频分复用(SFBC-OFDM)无线通信系统中适用于多径衰落信道下的迭代接收机的设计,导出了一种迭代的联合信道估计与符号检测的算法.在提出的算法中,信道估计器交替地工作于2种模式.在训练阶段,采用基于DFT的估计器估计出信道状态信息,并且采用所提出的算法估计出噪声方差和信道响应的互相关矩阵.在数据传输模式下,迭代地获得发送数据和信道状态信息.为了抑制由于符号检测中误判引起的错误传播,提出了一种简单的错误传播判定准则,并使用了一种自适应的训练机制来抑制误差传播.仿真结果显示,与传统的迭代算法相比,所提出的算法能够提供更好的误码性能,且节约了系统开销. 相似文献
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《洛阳师范学院学报》2015,(8):52-56
提出一种基于改进的Mean Shift算法的多人脸跟踪器.首先建立多个Mean Shift跟踪器对视频中的多个目标分别进行跟踪,针对多人脸跟踪过程中目标粘连、遮挡、个体对应以及目标更新等难题,提出最优排序法、目标消除法、多辅助信息和表决制策略等解决方案.引入卡尔曼滤波器预测目标的中心位置,减少目标丢失的可能性,提高算法的实时性.实验表明,该多人脸跟踪器可实时地实现多人脸跟踪,具有很强的鲁棒性. 相似文献
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林博艺 《赤峰学院学报(自然科学版)》2012,(20):15-19
针对基本PSO算法在全局优化中收敛精度低和易陷入局部极值的不足,提出一种基于混沌思想的多步搜索的新型的粒子群优化算法(CMPSO)。该算法先引入混沌思想对粒子种群进行位置初始化,然后再引入多步搜索,最后引入概率条件的选择性重新初始化。通过与其它三个改进算法比较,结果表明CMPSO算法的有效性。 相似文献
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针对非线性不等式状态约束滤波问题,提出一种基于内点法的不敏卡尔曼滤波算法。该算法在不敏卡尔曼滤波的基础上结合了优化算法的思想,采用内点优化法求解非线性不等式约束条件下的最优解。在算法实现过程中,引入障碍项,用无约束障碍函数近似化受约束目标函数,采用一个相当小的正数即障碍因子,通过序列极小化方法逐渐减小该障碍因子,经过迭代快速搜索出非线性不等式状态约束问题的近似最优解。对具有约束的航路跟踪系统进行实验仿真,实验结果表明新算法在处理非线性不等式状态约束滤波问题时,能够有效地提高状态估计精度,获得较高的滤波精度,且时间复杂度较低。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献