一种基于边缘信息的车辆检测和跟踪方法   总被引：1，自引：0，他引：1  

刘鹏  王国宇 《中国海洋大学学报(自然科学版)》2007,37(5):857-860,840

针对智能交通系统中运动车辆的检测和跟踪问题,提出1种基于边缘信息车辆检测和跟踪方法。利用背景边缘提取模板提取当前帧的精确背景边缘,进而获得前景车辆边缘,用形态学方法对其进行修复,寻找车辆的外轮廓,确定跟踪区域;由于车辆运动的特殊性,以当前帧的车速作为下一帧车速的预测值,并结合跟踪区域的外形信息进行匹配。从实验效果来看,该算法简单有效,适合于实时的车辆检测和跟踪系统。  相似文献   

湖南江华麻江源钨锡矿之初步观察     

张瑞锡 《地质论评》1950,15(Z1):38-42

引言麻江源位於湘南道县,江华、宁远、蓝山、四县交界之处,地处洪荒,人烟稀少,交通不便,通矿区之道路主要有二:一由江华东南行绕道水口再沿麻江河谷北行即至;二为由道县东南之四眼桥南行,经正冲而至矿区,二者相较以后者较为方便,一九四六年冬笔者与宫景光先生奉命调查湘、桂钨锡矿及稀有原素矿物;先行调查桂  相似文献   

On the Rocks and Metamorphism of Peyinchang Volcanic Series, Kaolan, Kansu     

S.H.SUNG 《地质学报》1949,(Z1):145-156,183

I. INTRODUCTIONIn July, 1946, while investigating the pyrite deposit ot Peyinchang, Kaolan,. Kansu [7], the writer noticed that the country rocks of the deposit, formerly recognized as a series of metamorphosed sedimentary rocks consisting mainly of phyllite, quartzite and schist by Mr. P. Chen [2], and Messrs. N. L. Liu, W. Y. Liang and T. C. Liu [4] who visited there in the years of 1940 and 1944 respectively, are far different in rock character as compared with the doubtless metamorphosed sedimentogenous rocks over-  相似文献   

西南极始新世假山毛榉叶化石新材料——兼论该属的起源、分类及其传播路线     

李浩敏  周浙昆 《中国科学D辑》2007,37(8):1046-1055

从叶形态学角度, 为假山毛榉科(Nothofagaceae)的建立提供了证据. 讨论与假山毛榉属的叶相似的印痕化石命名问题, 并为这类化石建立了一个形态属——Nothofagofolia gen. nov. 描述西南极南设得兰群岛乔治王岛费尔得斯半岛化石山新采集的这类叶化石中的新代表, 报道2个新种, 2个新组合, 1个未定种; 讨论和修订了已发表的这个产地的假山毛榉属叶化石. 通过叶形态学研究, 对假山毛榉属的分类、演化等提出下列看法: (1) 支持该属在晚白垩世中晚期起源于南半球高纬度地区, 并在那里分化、发展, 向低纬度扩散的观点; (2) 支持假山毛榉科的建立, 并认为叶形态学特征对此科科下等级的分类将具有一定的意义; (3) 该属南温带分布的种, 具有更为原始的叶形态性状, 叶等级低, 与其热带山区分布的种以及壳斗科和桦木科等相比, 处于更为原始的地位.  相似文献   

基于形态学理论的自动目标识别技术--自适应BP学习算法     

余农  吴常泳 《武汉大学学报(信息科学版)》2003,28(2):219-223

在设计了一种具有实用意义的形态学开、闭滤波的神经网络模型基础上，完成了用于目标检测识别的优化学习算法，为克服BP算法存在的收敛速度慢、需要选择学习参数且无法保证全局最优等固有缺陷，将启发引导策略与学习规则相结合，采用了一种动态调控学习参数的自适应BP学习算法。试验结果表明，该算法不仅能适应复杂多变的背景环境，而且对运动目标的持续检测能力具有位移不变、伸缩不变和旋转不变的特性。  相似文献   

数学形态学在遥感图像边缘检测中的应用   总被引：11，自引：1，他引：11  

林卉  舒宁  杜培军 《测绘通报》2003,(12):25-28

为有效提取边缘密度大的遥感图像中的边缘信息，提出一种边缘检测的有效算法。该算法在数学形态学的基础上，针对图像中噪声和边缘形态的不同建立多结构元素，利用灰度形态变换原理进行边缘提取。实验表明，与经典的边缘检测算子相比，该算法具有很好的边缘提取能力，但抗噪能力较差。为此，笔者还探讨性地提出基于小波变换和数学形态学相结合的边缘提取方法。  相似文献   

Effects of Integrated Exploration in Hydrocarbon-Prospective Areas of South China     

KongFanshu Zhengli LiZhiming 《应用地球物理》2003,6(1):6-11

The complicated topography, morphology and geology are characteristic of South China, where the frequently covered waters and igneous bodies and widely exposed carbonates are difficult to seismic survey. This paper describes the effect of combining exploration of gravitational, magnetic and electric methods in the complicated hydrocarbon areas in South China by some case histories. Many year‘‘s exploration practices in the exploring areas of more than 20 show that the non-seismic integrated (gravity/magnetic/electric) geophysical prospecting can play an important role not only in regional assessment, basin optimization and early basin evaluation,but also in finding objective of low resistance in areas of exposed carbonate with high resistance, contouring local structure, outlining igneous body and reef, and differentiating rock facies of basement. The results of the non-seismic integrated geophysical survey have pointed out the direction for deploying next prospecting in the specific areas of South China and the valuable experiences have been accumulated to carry out hydrocarbon-hunting in the future.  相似文献   

利用云导风矢量的台风中心自动定位   总被引：7，自引：0，他引：7  

刘正光  喻远飞  吴冰  刘还珠 《气象学报》2003,61(5):636-640

文中提出了一种利用云导风矢量图进行台风中心自动定位的方法。云导风矢量通过对具有一定时间间隔的两幅相关卫星云图进行模板匹配而得出。模板匹配就是根据已知模式的图像在一幅陌生图像中寻找对应于该模式的子图像的过程。根据气象知识 ,台风云系运动的特点是中心平移量大而自旋很弱 ,且台风中心与台风云系整体的移动方向一致 ,因此求出云导风矢量图中与台风整体移动矢量大小和方向一致的矢量集合的最密集区 ,经过数学形态学处理后便得到台风中心  相似文献   

TWO DIMENSIONAL NUMERICAL SIMULATION OF FLOWA ND GEO-MORPHOLOGICAL PROCESSES NEAR HEADLANDS BY USING UNSTRUCTURED GRIDResearch Associate, Dept. of Comput. Hydr., Water Research Center, Tehran, Iran,     

A.MOHAMMADIAN M.TAJRISHI LOTFIAZAD 《国际泥沙研究》2004,19(4):258-277

A two-dimensional mathematical model for simulating flow and sediment transport is presented. The model simulates flow and geo-morphological processes using a high order accurate, oscillation free scheme. The depth averaged Reynolds (shallow water) equations are used for flow simulation. Both equilibrium and non-equilibrium methods (by solving convection-diffusion equation) are used for sediment transport modeling while sediment carrying capacity is computed using different methods. A finite volume, flux difference splitting scheme is employed to solve the governing equations, which is able to simulate sub, super and transeritical flows with shock waves. Moreover, the numerical method is able to simulate flow over the variable topographies and it has a low level of numerical diffusion in the case of circulating flows like headlands. The computational grid of this model is triangular unstructured with variable size, which is flexible for arbitrary geometries and grid refinement. Using the model for simulating flow and sediment transport in some test cases such as a partially closed channel and comparing the results showed that the results obtained by the developed model were in a reasonable agreement with measurements and the other models cited.  相似文献   

Blake亚时及其形态学研究   总被引：3，自引：1，他引：2  

朱日祥  吴汉宁 《地球物理学报》1993,36(5):589-599

本文对西宁黄土剖面古土壤层S₁的721块定向样品进行了详细的岩石磁学和古地磁学研究,获得了Blake亚时转换过程中地球磁场变化特征较精确的记录。主要结果为:1.Blake亚时位于S₁的中下部;与地球磁场方向和强度变化相联系的持续时间分别为3900a和5000a。2.Blake亚时转换过程中地球磁场主体变化特征是由6次快速倒转构成,每次快速倒转所经历的时间为百年的量级,虚地磁极（VGP）极移曲线沿美洲大陆移动,这意味着在此期间地球磁场可能仍以偶极子场为主。3.Blake亚时是一次不成功的极性转换。4.黄土高原西部黄土-古土壤序列的主要磁性矿物可能仍是磁铁矿,次生剩磁主要是粘滞剩磁,当加热温度达到300℃之后即可获得单一组分的特征剩磁。  相似文献