Kalman滤波融合优化Mean Shift的目标跟踪

目标跟踪中,目标跟踪的实时性和精度是首先要考虑的问题,同时背景变化、形状改变、目标遮挡,往往会导致跟踪失败。针对此问题,首先优化了Mean Shift算法迭代权值,优化后主要灰度贡献更加突出,次要灰度受到抑制,提高了跟踪的精度、避免了开方的繁琐运算。然后提出目标模板更新算法,解决了背景剧烈变化和目标形状改变时跟踪失败的问题。最后将优化Mean Shift算法与Kalman滤波融合,通过残差判定目标运动状态。仿真实验和分析表明,Kalman滤波融合优化Mean shift算法在目标遮挡,目标形状改变,背景变化时具有更高的跟踪精度和实时性。     

基于Mean Shift算法的伪装目标跟踪

针对传统Mean Shift跟踪算法对伪装目标进行跟踪时容易陷入局部最大值导致跟偏甚至跟丢的问题,本文首先采用联合直方图来增强对目标特征的描述,然后在跟踪过程中以目标背景区分度为原则,动态更改目标描述模型和通过调整联合直方图各部分的权重来自适应背景的变化,以保证跟踪此类目标的鲁棒性.实验证明,针对与背景相似的伪装目标,改进的Mean Shift算法仍能对其进行有效准确的跟踪.     

复杂背景及遮挡条件下的运动目标跟踪

CamShift算法应用于复杂背景及遮挡条件下视频跟踪时,极易出现跟踪失效和目标丢失。本文提出基于颜色、纹理及目标运动信息的综合特征用于改进CamShift算法,结合Kalman滤波器对目标运动状态进行预测提高了复杂背景下运动目标的跟踪稳定性和跟踪精度。在目标发生遮挡时,通过目标遮挡前的先验信息进行最小二乘拟合及目标运动轨迹外推,预测目标运动位置信息,有利于遮挡结束时对运动目标的重新捕获。多组实验结果及性能分析表明,该算法在复杂背景及目标被短时遮挡情况下,可以实现目标的持续、稳定跟踪,并具有较好的实时性。     

基于LabVIEW的红外人体目标跟踪

针对红外图像序列信噪比低,缺少边缘及纹理信息,以及人体目标运动自主性强且姿态复杂多变的特点,选用Mean Shift目标跟踪算法,对红外人体目标进行跟踪.针对传统Mean Shift目标跟踪算法不能对尺度变化的红外目标进行有效跟踪的问题,对原有算法进行改进,使用边缘加权直方图与模板中心加权直方图计算Bhattacharyya系数的方式,实现核函数带宽的自适应,并利用界面友好的LabVIEW2011平台进行实现.通过两组实验证明了改进后算法的可行性和有效性.     

复杂背景下的红外目标自动跟踪算法

提出了一种非线性边缘检测和Mean Shift方法相结合的红外目标检测与跟踪算法.采用双窗口算子的非线性边缘检测算法具有计算量小、速度快、图像质量好等优点.在边缘检测后的二值图像基础上,利用改进的Mean Shift跟踪算法实施目标跟踪.该跟踪算法融合了计算目标区域局部标准差的信息;利用灰度值和局部标准差的概率密度函数来描述目标;同时选择核函数级联方式进行目标密度估计,从而弥补了仅用灰度信息描述目标特征的不足.实验结果表明,该跟踪算法检测出的复杂背景下红外目标边缘清晰,并且能够准确地对目标实施自动跟踪.     

试析网络视频监控中运动目标跟踪方法改进

本文简单的介绍了网络视屏监控的系统框架,并进一步的研究和探讨了Mean Shift目标跟踪算法及其改进方法,希望能够有效的促进我国网络视频监控目标跟踪的实时性和有效性。     

改进的Mean Shift算法在前视声呐运动目标跟踪中的应用

多波束前视声呐具有成像速度快、分辨率高的优点,是进行水下目标探测、跟踪和监控的重要设备。针对多波束前视声呐运动目标的跟踪问题,提出了一种改进的MeanShift算法。该算法利用经典的MeanShift算法实现目标的帧间定位,通过基于图像序列的背景消减法实现运动目标分割,根据分割后目标的位置和大小对Mean Shift跟踪框进行更新,并重新建立跟踪模型来迭代实现目标的准确定位和跟踪。实验结果表明,改进后的算法可实现目标跟踪框随目标大小和形状的更新,对目标的定位更加准确。因此,该算法具有应用于水下目标精确跟踪和定位的潜力。     

基于先验知识模板更新的头部跟踪算法

针对被跟踪头部目标特征状态随时间变化而与参考模板不匹配的问题,本文提出一种利用先验知识来指导Mean Shift算法中参考模板更新的策略.该方法根据被跟踪目标不同状态下所呈现出颜色的统计特征信息,采用辅助模板对候选模板中的不同颜色特征进行指导性更新,从而形成一个具有目标先验知识的参考模板,解决了模板更新时机选择的难题.实验结果表明,该算法有效解决了因头部旋转而导致模板不匹配的问题,实现了头部的连续跟踪,取得了很好的跟踪效果,并且提高了跟踪算法的自适应能力.     

核函数带宽自适应的Mean shift目标跟踪算法

针对Mean shift核函数带宽不能实时改变的缺陷,提出一种仿射变换下的核函数带宽可变的Mean shift跟踪算法。以仿射变换来描述目标尺寸随时间的变化,分别利用Mean shift和连续两帧中匹配窗口的最大相关系数来得到仿射变换的参数。以比例参数计算出带宽的实时变化,其它参数可提供Mean shift更好的起始位置。这些工作改善了Mean shift算法在目标尺寸变化时的跟踪效果。实验证明,本算法能够有效地跟踪尺寸变化的目标,并且具有更好的实时性。     

基于卡尔曼滤波的多运动目标跟踪算法研究

针对多运动目标跟踪的实时性和鲁棒性问题,本文提出了一种基于卡尔曼滤波的多运动目标跟踪算法,该算法运用卡尔曼滤波预测目标的位置,并以目标的中心点坐标、面积和长宽比特征、一维HSV颜色直方图作为目标的特征对当前帧检测到的目标模板和预测区域内的目标进行匹配。实验证明,该算法可实时、稳定地跟踪复杂场景内的多运动目标,并能够解决目标遮挡问题。     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.     

新闻(英文)

正China and Greece Sign the Standardization Cooperation Agreement Witnessed by Chinese Premier Li Keqiang and Greek Prime Minister Antonis Samaras,AQSIQ Minister Zhi Shuping and ELOT Chairman and Executive Director Angelos Tolkas signed the SAC-ELOT Standardization Cooperation Agreement.The Agreement is one of the critical cooperation documents signed during Li Keqiang’s visit in Greece,encouraging China and Greece to     

Win-Win Cooperation

正The Chinese Premier Li Keqiang's recent trip to the UK has reinforced the China-UK comprehensive strategic partnership;just as the British Prime Minister David Cameron put it,"the relationship is gaining in strength,depth and understanding"after a bucket of business deals being inked worth more than 30 billion US dollars.From the first agreement signing in 2004 to the new agreement of mutual standards recognition and adoption in     

Systematic Approach for Emerging Industry

正A national directory of standards complexes for strategic emerging sectors was recently developed and released jointly by 12governmental departments,namely,SAC,NDRC,MOST,MIIT,MEP,MOA,AQSIQ,State Forest Administration,State Administration of Science and Technology for National Defense,State Oceanic Administration and National Railway Administration.     

Strictest Pollutants Emission Standards

正Four new national standards on air pollutant emission control offi cially issued by the Ministry of Environment Protection(MEP)together with AQSIQ and SAC has been brought into force from July 1,2014.The Emission standard for air pollutants of coal-burning,oil-burning and gasfi red boilers,which is the strictest emission standard historically,will tackle the stubborn pollution problem of boilers and waste incineration in most of China’s regions.     

Instructions to Authors

New Carbon Materials is a bimonthly journal published with the permission of the Ministry of Science and Technology and of the State News and Publication Agency.The journal is sponsored by the Institute of Coal Chemistry,Chinese Academy of Sciences,and is published by Science Press.Aims and Scope     

Progress on Standards Copyright Protection

正Recently,National Copyright Administration of China(NCAC)has rewarded 215 organizations and 179 individuals for their outstanding efforts on investigating standards copyright infringement and piracy in 2013.Hua Jianhua,the Deputy-Director of National Standards Copyright Protection Workgroup Office won a third prize of the national individual award.In 2012,SAC set up the national standards copyright protection working group,and developed policies to crack down standards infringement and piracy behaviors and to strengthen standards copyright protection.