基于稀疏表达特征选择的压缩感知目标跟踪算法

目标跟踪是计算机视觉领域重要研究方向之一。压缩感知跟踪速度快、精度高,但是跟踪被遮挡目标时使用被遮挡的哈尔特征构建分类器,导致分类器性能降低,目标容易丢失。为了解决该问题,提出了根据l1稀疏表示判断哈尔特征是否被遮挡,然后使用未被遮挡的特征构建贝叶斯分类器。首先对每一帧跟踪结果运用稀疏表示提取出未被遮挡特征的集合,在构建贝叶斯分类器时仅使用未被遮挡的特征。然后使用训练好的分类器对下一帧候选样本进行分类,选取具有最大分类响应的候选样本作为跟踪结果。实验结果表明,该算法在跟踪目标部分遮挡时相比CT算法有更高跟踪准确度,算法能够实时得到高效、准确的目标跟踪结果。     

基于改进Camshift算法的多目标自适应跟踪

针对多目标跟踪中常因目标间遮挡、融合、分离等导致跟踪失败,提出了用动态背景建模技术和RGB三通道色差法获取目标群组,然后利用Kalman滤波器预测运动目标初始参量,再用改进的Camshift算法逐步迭代逼近各个目标精确位置,实现了对多目标的自适应跟踪.经大量实验证明,本算法目标识别能力强,抗噪声性能好,跟踪速度快.     

基于Meanshift采样的辅助变量粒子滤波跟踪算法

针对视频图像运动目标跟踪时的时延问题和目标被遮挡时易丢失的问题,提出了一种基于Meanshift采样的辅助变量粒子滤波跟踪算法。采用AVPF算法作为跟踪算法的主体框架,对每个辅助采样粒子进行Meanshift转移,利用采样粒子确定候选目标区域,对候选目标模型与目标模型进行相似性度量,更新粒子权重,最后估计目标状态。仿真结果显示,本文算法能够有效处理跟踪过程中目标部分被遮挡的问题,具有较好的鲁棒性和较好的实时性。     

考虑遮挡的视频车辆跟踪

为了对遮挡情况下的运动车辆进行跟踪,提出一种基于分块的车辆跟踪算法。该算法将目标车辆以可重叠的方式划分为若干大小一致的子块。在分块的基础上估计所有子块的运动矢量,检测噪声运动矢量并进行调整,以减少运动矢量估计的误差,然后对子块进行移位以实现车辆跟踪。为了处理车辆间的遮挡现象建立了马尔可夫随机场描述子块之间的关系,利用欧氏距离定义块的邻域,并基于块的直方图构建能量函数,最后利用模拟退火法对能量函数进行优化,以对遮挡区域进行分割。实验结果表明,该算法能够对遮挡车辆进行准确跟踪。     

一种新的基于闪烁噪声的扩展目标跟踪方法

针对闪烁噪声采用高斯分布建模敏感度大的问题,提出一种闪烁噪声下基于变分贝叶斯(VB)的扩展目标跟踪算法。在量测噪声逆协方差未知条件下,该算法首先将量测噪声建模为t分布,继而通过VB近似量测噪声逆协方差、目标状态以及自由度的后验概率密度,最后给出其高斯伽马混合分布实现。仿真实验表明,所提算法可以自适应地跟踪多参数未知情况下的多扩展目标,与传统算法相比具有较高的跟踪精度。     

基于扩展MeanShift算法的移动目标跟踪研究及实现

为克服时间差分法、模板匹配法、背景去除法以及光流法等传统移动目标跟踪方法的缺点,研究了MeanShift算法及扩展MeanShift算法,然后以LabVIEW为软件平台,实现了基于扩展MeanShift算法的移动目标跟踪程序,并用实验验证了扩展MeanShift算法在移动目标跟踪中的应用具有实时性、实用性、准确性和稳定性。实验结果表明,扩展MeanShift算法能很好地跟踪移动目标,甚至在移动目标被部分遮挡时也能对目标进行准确跟踪。     

基于核函数的目标跟踪系统建模与仿真

针对目标跟踪中的快速运动、旋转、遮挡等问题,采用核函数算法实现目标跟踪。利用卷积实现密集采样,使用高斯核函数岭回归估计目标位置,在线更新高斯模型和核相关滤波器。通过OTB数据集对算法进行实验验证,结果表明,算法Precision能达到69.7%,Success达到66.8%,跟踪速度达412fps。实验表明,算法在跟踪过程中可对旋转、模糊、遮挡图像中的目标进行有效跟踪,在多个指标上优于其它比较算法。     

智能视频监控系统中的目标跟踪方法研究

针对单一的传统目标跟踪算法计算量大、跟踪易丢失等问题,采用均值漂移算法嵌入到粒子滤波的跟踪框架中,遇到遮挡时,算法切换到粒子滤波进行跟踪,并采用重采样方法来抑制粒子退化现象;而在无遮挡时,采用均值漂移算法来提高跟踪的实时性和鲁棒性。实验结果表明,该算法可以增强算法目标在遮挡情况下的实时性和鲁棒性。     

实时视频中多目标遮挡跟踪方法研究

在监控背景固定的情况下,提出了基于目标模型的多目标遮挡跟踪方法。首先建立目标模型,包括颜色、形状及运动特征,然后通过帧间建立的匹配矩阵判定目标是否发生遮挡。当目标发生遮挡时,提出生成"虚目标"进行遮挡目标定位,再通过概率推理方法计算遮挡目标的可见度。实时视频上的实验结果表明,算法能在遮挡时准确跟踪及识别目标。     

基于特征融合的复杂场景多目标跟踪算法研究

在复杂地物类型背景条件下,多目标跟踪算法通常表现出目标识别与跟踪能力较差问题,特别在被其它地物遮挡后目标跟踪丢失更严重。提出一种改进的基于多源特征提取与特征融合的多目标跟踪算法。为提高目标在复杂背景下的空间分辨力,充分利用对异类物体判别能力较强的高层特征和针对同类不同物体判别能力较强的浅层特征,提高复杂背景下地物目标的识别能力。同时,为了解决物体被遮挡后导致跟踪算法丢失目标问题,利用滤波器获得追踪目标的空间尺度大小,提高跟踪算法的准确性与可靠性。实验表明,多目标跟踪算法识别目标的准确性可达87.5%,误差在[±2.31%]左右,具有良好的尺度估计效果。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

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?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

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.     

浅谈移民问题

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.     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

Sister Carrie, an Adherent of Desires

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.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…