首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
均值移动算法收敛性及均值移动矢量夹角分析   总被引:1,自引:1,他引:0  
均值移动算法是一种统计迭代算法,目前在图像处理中得到了广泛应用。但是对其性质的分析仍然不完善,针对以往文献对均值移动算法收敛性证明的错误和不足,根据柯西收敛定理严格证明了均值移动算法的收敛性;证明了基于任意核,两连续均值移动矢量的夹角都不大于90°。  相似文献   

2.
均值漂移算法的研究与应用   总被引:4,自引:0,他引:4  
对均值漂移算法的理论和应用作一全面的综述.首先根据密度函数的非参数估计推导出均值漂移公式的一般形式,说明了均值漂移迭代算法的步骤及收敛性;然后重点讨论核函数的选择以及带宽矩阵的计算等关键技术;最后归纳了均值漂移算法在模式检测、聚类、图像分割以及物体实时跟踪等方面的应用,并展望了均值漂移算法在理论和应用中的研究方向.  相似文献   

3.
孔军  汤心溢  蒋敏  葛运建 《计算机工程》2011,37(22):164-167
为在图像对比度较低、相似目标过多等情况下较好地实现目标跟踪,提出一种基于多尺度特征提取的均值漂移跟踪算法.前一帧目标区域的特征点经匹配得到后续帧目标区域的特征点,利用所得特征点集的中心坐标修正均值漂移搜索窗位置,以此为约束条件,减小均值漂移迭代产生的偏差.实验结果表明,该算法可以提高跟踪精度、鲁棒性及实时性.  相似文献   

4.
迭代过程中带宽的大小对算法的准确性和效率有很大的影响,它不但决定了参与迭代的采样点数量,而且还会影响算法的收敛速度和准确性,因此带宽的选择十分重要。采用相关性比较算法计算均值漂移算法中的带宽,然后将均值漂移算法用于图像分割。实验结果表明,新算法能够获得较好的图像分割效果和质量。  相似文献   

5.
针对传统均值漂移算法对图像纹理特征不敏感的不足,利用图像纹理特征的独特性,提出了一种基于颜色纹理的均值漂移分割算法.结合欧式距离和高斯函数计算当前像素点与其周围像素点的颜色相似度,再使用Gabor变换提取图像不同方向、尺度上的纹理特征,结合颜色的相似度,对该像素点均值漂移的过程加权.该算法充分考虑了图像纹理的周期性、尺度性以及图像颜色的关联性.实验结果表明,算法对色彩信息不明显的纹理图像有良好的分割效果,也会提高彩色图像分割结果的准确性.分割算法用于大型水上桥梁识别,能够提高桥梁识别率.  相似文献   

6.
自适应带宽均值移动算法及目标跟踪   总被引:1,自引:0,他引:1  
首先提出了一种经典均值移动算法的推广算法,即自适应带宽均值移动算法,进而提出了基于自适应带宽均值移动的二维视频目标跟踪算法(ABMSOT).前者提出了在带宽自适应情况下均值移动算法求取局部极值的框架步骤,后者可实时跟踪目标的位置、大小和方向.在ABMSOT算法中,目标模型和候选模型采用自适应带宽核函数加权特征直方图描述,目标模型和候选模型的相似性采用Bhattacharyya系数度量;通过迭代两步法搜索到目标最有可能的位置、大小和方向.第一步执行一次均值移动迭代搜索目标位置,第二步计算出最能描述目标区域大小和方向的带宽矩阵.从理论上证明了两个算法的收敛性,并通过实验证明了ABMSOT算法能实时跟踪目标的位置、大小和方向.  相似文献   

7.
为了快速得到高质量的重建图像,提出了对称共轭梯度法成像算法,大大缩减了迭代次数,同时,将ERT物理模型进行规范化和Tikhonov正则化处理,进而将QR分解的思想引入ERT方程的求解中,提出基于QR分解的对称共轭梯度算法,实现了单步图像重建.理论分析表明,该算法具有良好的收敛性.通过典型流型的仿真实验,证明了该算法可以...  相似文献   

8.
均值漂移算法是一种高效的模式匹配算法.在传统的均值漂移方法基础上,本文针对运动范围较大的目标跟踪问题进行研究,提出一种基于Bhattacharyya系数的由粗到精的核匹配搜索方法.该算法能够有效利用相似性度量函数Bhattacharyya系数在实现对运动目标初始的粗定位情况下,利用均值漂移方法进行迭代求解局部最优值,从而实现目标的精定位,成功实现大范围运动目标的跟踪.实验结果验证该算法在跟踪精度和速度上均优于传统方法.  相似文献   

9.
带有迭代学习前馈的快速路无模型自适应入口匝道控制   总被引:4,自引:1,他引:3  
提出了一种新的带有迭代学习前馈的快速路无模型自适应入口匝道控制算法. 模块化的前馈迭代学习和反馈MFAC控制器设计方案使所设计的控制系统有效地利用了交通流的周期性特征, 提高了控制品质. 严格的数学推导证明了该方法的收敛性. 仿真研究及比较结果验证了所提算法的有效性.  相似文献   

10.
非均匀三次B样条曲线插值的GS-PIA算法具有简单、稳定及收敛速度较快等优点.文中详细阐述了GS-PIA算法的几何意义,严格证明了算法的收敛性.首先定义算法配置矩阵的比较矩阵,借助矩阵理论的正则分裂证明比较矩阵对应的迭代矩阵的收敛性;然后利用矩阵的相似性,证明了非均匀三次B样条曲线插值的GS-PIA算法的收敛性.为GS-PIA算法的进一步研究及其在计算机图形学等相关领域的应用打下了理论基础.  相似文献   

11.
Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.  相似文献   

12.
European Community policy and the market   总被引:1,自引:0,他引:1  
Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.  相似文献   

13.
融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。  相似文献   

14.
Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.  相似文献   

15.
This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.  相似文献   

16.
Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008  相似文献   

17.
Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.  相似文献   

18.
《计算机科学》2007,34(4):148-148
Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.  相似文献   

19.
为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.  相似文献   

20.
This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)SM and Team Software Process (TSP){SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号