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基于物方影像匹配和概率松弛的断面自动提取 被引量:13
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作者 郑顺义 张祖勋 张剑清 《测绘信息与工程》 2004年第2期26-27,共2页
提出了基于物方影像匹配的断面提取 ,为了提高匹配的可靠性 ,引入了概率松弛法 。
关键词 方影像匹配 断面提取 概率松弛法 铅垂线轨迹法
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一种基于物影匹配算法的道路小目标跟踪方法 被引量:1
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作者 项新建 胡海斌 +3 位作者 姚佳娜 丁祎 郑永平 金立 《交通运输系统工程与信息》 EI CSCD 北大核心 2022年第6期85-94,共10页
针对复杂道路环境下小目标抛洒物难以被检测与跟踪,且落地静止像素易被纳入背景而导致目标丢失等问题,本文提出一种基于物影匹配算法(OSMA)的道路小目标跟踪方法来解决上述问题。首先,采用混合高斯模型对背景进行建模以此获取前景图像,... 针对复杂道路环境下小目标抛洒物难以被检测与跟踪,且落地静止像素易被纳入背景而导致目标丢失等问题,本文提出一种基于物影匹配算法(OSMA)的道路小目标跟踪方法来解决上述问题。首先,采用混合高斯模型对背景进行建模以此获取前景图像,对前景图像采用膨胀、腐蚀等形态学处理;其次,根据道路抛洒物移动时在前景产生独立的物与影双轮廓特征,进行连续帧前景轮廓的物影匹配,并将连续的匹配结果定为疑似抛洒物;最后,采用多帧质心偏移法判断疑似抛洒物是否处于静止状态,并对运动状态中的疑似抛洒物进行位置判定与帧间轮廓匹配,从而实现抛洒物的逐帧跟踪。基于大量实验表明:本文所提出的OSMA与核化相关滤波器(KCF)、辨别尺度空间跟踪器(DSST)、背景感知相关滤波器(BACF)、深度注意力跟踪器(DAT)、视觉跟踪时空变换器(SATRK)等跟踪器相比,准确性更优越,可较好解决道路复杂场景下各类抛洒物的跟踪问题;复杂背景、快速旋转的小目标场景中跟踪表现优异,具有良好的跟踪尺度,实时性满足预期要求。 展开更多
关键词 智能交通 道路抛洒跟踪 匹配 小目标抛洒 复杂道路环境 滤波跟踪
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像方与物方相互结合的无人机航空影像匹配研究 被引量:4
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作者 韩有文 王海涛 杜成欧 《测绘通报》 CSCD 北大核心 2019年第S1期303-309,共7页
提出了将像方与物方相结合的两阶段的无人机航空影像匹配方法,该方法可兼顾多视影像匹配可靠性和高精度空三解算的要求,同时也顾及了匹配效率。该方法利用无人机影像航带内重叠度大,影像间的变形对匹配影响小的优势,借助循序渐进的思路,... 提出了将像方与物方相结合的两阶段的无人机航空影像匹配方法,该方法可兼顾多视影像匹配可靠性和高精度空三解算的要求,同时也顾及了匹配效率。该方法利用无人机影像航带内重叠度大,影像间的变形对匹配影响小的优势,借助循序渐进的思路,在'像方'使用缩小影像快速开展多视影像匹配,同时采用光束法平差解算影像较为精确的外方位元素和计算地形数据(DSM)并对影像正射纠正。接下来,在'物方'利用正射影像开展二次匹配,这样不仅可以减少影像旋转、尺度缩放、放射变换、投影变形等对匹配的影响(特别是减小投影变形对航带间影像匹配的影响),提高了多视影像间匹配同名点的数量及分布均匀度,增强匹配的可靠性;在'物方',还保证了SIFT算法在同一影像尺度下提取特征点,提高了空三解算精度。通过选取不同地形类别的无人机航空影像试验验证,表明在'物方'采用正射影像开展多视影像匹配,航带间影像匹配点的数量明显提高(丘陵等平坦区域,点的数量增加约6倍;高山区域,点的数量增加约4~6倍,其中重叠度较小的影像间增加约4倍,重叠度较大的影像间增加约6倍),较传统的SIFT算法,空三解算精度提高约30%~40%。 展开更多
关键词 无人机航空摄影 多视影像匹配 匹配 SIFT(Scale-invariant feature transform)
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基于核线约束的物方密集匹配方法在输电线路工程中的应用 被引量:1
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作者 张兵 黄锟 王隆 《内蒙古电力技术》 2016年第1期6-9,共4页
基于核线约束的物方密集匹配方法采用基于像—物空间关系的匹配策略,通过同时匹配多景影像来直接获取地形和地貌要素的特征信息。该方法可应用于输电线路工程中生成DEM和DOM。对生成的DEM数据进行滤波处理,并对该方法、传统的航空影像... 基于核线约束的物方密集匹配方法采用基于像—物空间关系的匹配策略,通过同时匹配多景影像来直接获取地形和地貌要素的特征信息。该方法可应用于输电线路工程中生成DEM和DOM。对生成的DEM数据进行滤波处理,并对该方法、传统的航空影像匹配方法生成的DOM采集地物坐标与GPS-RTK测量结果进行精度对比,结果表明,该方法能够有效提高DEM和DOM的精度。 展开更多
关键词 航空摄影测量 输电线路工程核线约束 方密集匹配 数字高程模型 数字正射影像图
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物方面元匹配在倾斜摄影三维重建中的应用
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作者 何维龙 王福平 郑川江 《北京测绘》 2021年第4期449-452,共4页
采用传统的最小二乘影像匹配方法匹配倾斜影像时,倾斜影像灰度和几何畸变较大,地物遮挡较多,导致匹配到的同名像点分布不均匀,匹配可靠性较低影响三维重建效果。提出采用物方面元匹配方法对倾斜影像做精化匹配。匹配方法的过程是:首先... 采用传统的最小二乘影像匹配方法匹配倾斜影像时,倾斜影像灰度和几何畸变较大,地物遮挡较多,导致匹配到的同名像点分布不均匀,匹配可靠性较低影响三维重建效果。提出采用物方面元匹配方法对倾斜影像做精化匹配。匹配方法的过程是:首先根据初匹配生成的物点信息,采用物方差分法计算物方面元的法向量方向角;然后根据极限约束估计同名像点坐标,进而前方交会求解物方面元高程初值;最后将物方面元法向量方向角和高程初值带入条件方程,做最小二乘匹配迭代计算,实现倾斜影像同名点匹配。在经过实验验证后发现:本文方法用于倾斜影像匹配时,可提高同名点匹配的可靠性和分布的均匀性。 展开更多
关键词 三维重建 倾斜影像匹配 方面元匹配 最小二乘匹配
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Integration of Lab model and EHOG for human appearance matching across disjoint camera views 被引量:2
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作者 杨彪 林国余 张为公 《Journal of Southeast University(English Edition)》 EI CAS 2012年第4期422-427,共6页
The integration of the Lab model with the extended histogram of oriented gradients (EHOG) is proposed to improve the accuracy of human appearance matching across disjoint camera views under perturbations such as ill... The integration of the Lab model with the extended histogram of oriented gradients (EHOG) is proposed to improve the accuracy of human appearance matching across disjoint camera views under perturbations such as illumination changes and different viewing angles. For the Lab model that describes the global information of observations, a sorted nearest neighbor clustering method is proposed for color clustering and then a partitioned color matching method is used to calculate the color similarity between observations. The Bhattacharya distance is employed for the textural similarity calculation of the EHOG which describes the local information. The global information, which is robust to different viewing angles and scale changes, describes the observations well. Meanwhile, the use of local information, which is robust to illumination changes, can strengthen the discriminative ability of the method. The integration of global and local information improves the accuracy and robustness of the proposed matching approach. Experiments are carried out indoors, and the results show a high matching accuracy of the proposed method. 展开更多
关键词 human appearance matching Lab model extended histogram of oriented gradients (EHOG) disjoint camera views
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中、印、美三国健康水平及其影响因素的比较
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作者 王梅 李卫平 方立 《中国卫生经济》 1995年第2期13-16,共4页
本文试图在中美、中印典型个案比较研究的基础上,综合分析影响各国健康水平的主要因子,及其作用和相关关系,进而揭示了“中国卫生保健模式”的深刻内涵。
关键词 中国 印度 美国 健康水平 匹配 比较
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Part-level 3-D object classification with improved interpretation tree
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作者 邢薇薇 刘渭滨 袁保宗 《Journal of Southeast University(English Edition)》 EI CAS 2007年第2期221-225,共5页
For classifying unknown 3-D objects into a set of predetermined object classes, a part-level object classification method based on the improved interpretation tree is presented. The part-level representation is implem... For classifying unknown 3-D objects into a set of predetermined object classes, a part-level object classification method based on the improved interpretation tree is presented. The part-level representation is implemented, which enables a more compact shape description of 3-D objects. The proposed classification method consists of two key processing stages: the improved constrained search on an interpretation tree and the following shape similarity measure computation. By the classification method, both whole match and partial match with shape similarity ranks are achieved; especially, focus match can be accomplished, where different key parts may be labeled and all the matched models containing corresponding key parts may be obtained. A series of experiments show the effectiveness of the presented 3-D object classification method. 展开更多
关键词 3-D object classification shape match similarity measure interpretation tree
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150年前的数学理论呈现新活力
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作者 Elizabeth A.Thomson 曹希斌 余维和 《世界科学》 1993年第8期3-3,共1页
这是一位科学家的愿望:当获悉150年以前发展的一个数学领域里,取得了一个新发现时,确认这个数学领域能有助于他正在研究的一种新材料。材料科学和工程学教授托玛斯(Thomas)博士打电话给麻省阿默斯特大学两位数学家中的一位D.霍夫曼(Davi... 这是一位科学家的愿望:当获悉150年以前发展的一个数学领域里,取得了一个新发现时,确认这个数学领域能有助于他正在研究的一种新材料。材料科学和工程学教授托玛斯(Thomas)博士打电话给麻省阿默斯特大学两位数学家中的一位D.霍夫曼(David Hoffman)教授联系,他在文章中报道了这个新发现。他们的讨论,使材料科学和数学学科之间架起了桥梁,并致使托玛斯教授在聚合物方面的工作取得了突破。 展开更多
关键词 材料科学 曲面 数学理论 匹配物
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一种基于分布式模型框架快速计算DEM、DOM、图幅产品的方法
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作者 聂丹 邓鸿俊 《测绘通报》 CSCD 北大核心 2011年第11期32-33,70,共3页
利用物方匹配计算模型,实现了DEM、DOM、图幅产品的分布式计算模型,极大地提高了计算精度和速度。
关键词 分布式计算 匹配 DEM
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Assessing Risk in Chemical Plant with Pattern Matching
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作者 P.K.Bandyopadhyay S.C.Roy S.N.Sen 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2002年第2期249-253,共5页
This paper discusses potential application of fuzzy set theory,more specifically, pattern matching, in assessing risk in chemicalplants. Risk factors have been evaluated using linguisticrepresentations of the quantity... This paper discusses potential application of fuzzy set theory,more specifically, pattern matching, in assessing risk in chemicalplants. Risk factors have been evaluated using linguisticrepresentations of the quantity of the hazardous substance involved,its frequency of interaction with the environment, severity of itsimpact and the uncertainty involved in its detection in advance. Foreach linguistic value there is a corresponding membership functionranging over a universe of discourse. The risk scenario created by ahazard/hazardous situation having highest degree of featural value istaken as the known pattern. 展开更多
关键词 RISK chemical process fuzzy set pattern matching
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Overview on Environmental Comprehensive Management System Established in Imitation of Biome 被引量:1
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作者 李如燕 孙可伟 《Journal of Shanghai Jiaotong university(Science)》 EI 2004年第3期88-94,共7页
Environmental comprehensive management system, called “the bionic community”, can be established in imitation of biome, which can transform the wastes generated in a certain field into the raw materials of other fie... Environmental comprehensive management system, called “the bionic community”, can be established in imitation of biome, which can transform the wastes generated in a certain field into the raw materials of other field. The establishment of the bionic community includes two aspects, i.e., the matching technique and the management system. The main matching technique is the preparation of composite materials made of various wastes. This new kind of material can be divided into four types: polymer matrix, silicate matrix, metal matrix and carbon matrix(or ceramic matrix). The environmental comprehensive management system is formed by organizing a trans-trades joint-management business entity with the products of composite material made of wastes at the core. 展开更多
关键词 ENVIRONMENTAL COMPREHENSIVE management IMITATION BIOME
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Three-Wave Resonant Interaction of Bogoliubov Excitations in a Bose-EinsteinCondensate with Diffraction
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作者 SUNChun-Liu HUANGGuo-Xiang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2004年第5期699-706,共8页
We investigate the three-wave resonant interaction (TWRI) of Bogoliubov excitations in a disk-shaped Bose-Einstein condensate with the diffraction of the excitations taken into account. We show that the phase-matching... We investigate the three-wave resonant interaction (TWRI) of Bogoliubov excitations in a disk-shaped Bose-Einstein condensate with the diffraction of the excitations taken into account. We show that the phase-matching condition for the TWRI can be satisfied by a suitable selection of the wavevectors and the frequencies of the three exciting modes involved in the TWRI. Using a method of multiple-scales we derive a set of nonlinearly coupled envelope equations describing the TWRI process and give some explicit solitary-wave solutions. 展开更多
关键词 SOLITON three-wave resonant DIFFRACTION
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Evaluating the Impact of Adoption of Improved Maize Varieties on Yield in Uganda: A Propensity Score Matching Approach
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作者 Margaret Nabasirye Barnabas Kiiza George Omiat 《Journal of Agricultural Science and Technology(B)》 2012年第3期368-377,共10页
The main objective of this study was to evaluate the impact of adopting improved maize varieties on crop yield in Uganda using propensity score matching (PSM) algorithms to control for hidden selection bias. The stu... The main objective of this study was to evaluate the impact of adopting improved maize varieties on crop yield in Uganda using propensity score matching (PSM) algorithms to control for hidden selection bias. The study employed cross-sectional household data collected in 2005/2006 by the Uganda Bureau of Statistics (UBOS) across the country. Data were divided into two parts; the full sample and smallholder farmer sub-sample (those that cultivated less than 5 acres or 2 Hectares of maize in 2004 and 2005). Then estimation was made of the difference in yields between the adopters and non adopters, the average treatment effect on the treated (ATT) for the full sample and smallholder farmer sub-sample. Matching methods were used to control for hidden selection bias and the standardized bias measure was used to check for the quality of matching. The results indicate that adoption of improved maize seed had a robust positive and significant effect on yields obtained by farmers. The results were consistent for both the full and smallholder farmer sub-samples. Sensitivity analysis using Rosenbaum bounds indicated that the ATT results were fairly robust to hidden selection bias. That is, the results were not sensitive to unobserved selection bias. Therefore it is confidently asserted that the estimated average difference in maize yields between the adopters and non-adopters was due to the effect of planting improved maize seed. 展开更多
关键词 ADOPTION impact evaluation improved maize seed propensity score matching Uganda.
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A Review for Model Plant Mismatch Measures in Process Monitoring
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作者 王洪 谢磊 宋执环 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第6期1039-1046,共8页
Model is usually necessary for the design of a control loop. Due to simplification and unknown dynamics, model plant mismatch is inevitable in the control loop. In process monitoring, detection of mismatch and evaluat... Model is usually necessary for the design of a control loop. Due to simplification and unknown dynamics, model plant mismatch is inevitable in the control loop. In process monitoring, detection of mismatch and evaluation of its influences are demanded. In this paper several mismatch measures are presented based on different model descriptions. They are categorized into different groups from different perspectives and their potential in detection and diagnosis is evaluated. Two case studies on mixing process and distillation process demonstrate the efficacy of the framework of mismatch monitoring. 展开更多
关键词 model plant mismatch process monitoring control loop behavior
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倾斜影像自动空三及其在城市真三维模型重建中的应用 被引量:130
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作者 李德仁 肖雄武 +2 位作者 郭丙轩 江万寿 时月茹 《武汉大学学报(信息科学版)》 EI CSCD 北大核心 2016年第6期711-721,共11页
在一种具有视点不变性的改进的倾斜影像自动匹配方法的基础上,针对多视倾斜影像光束法平差方法中未知参数多的问题(例如可能导致平差解算不稳定),提出了带有相对姿态参数的倾斜影像光束法平差模型,并给出了该模型的适用范围。对一套典... 在一种具有视点不变性的改进的倾斜影像自动匹配方法的基础上,针对多视倾斜影像光束法平差方法中未知参数多的问题(例如可能导致平差解算不稳定),提出了带有相对姿态参数的倾斜影像光束法平差模型,并给出了该模型的适用范围。对一套典型的数字倾斜摄影仪SWDC-5的倾斜影像数据进行实验,结果表明:当相机之间曝光延迟小,且相对姿态参数可以看作比较严格的刚体时,该方法的自动空中三角测量(简称空三)处理精度较高,单位权中误差为0.46像素,像点平均残差为0.27像素。将该空三成果应用到城市真三维模型重建中,计算机自动得到的三维表面模型纹理比较自然、真实,能够满足一定程度的视觉需求,为大规模城市真三维模型重建提供了参考。 展开更多
关键词 倾斜影像光束法平差 倾斜影像匹配 方面元多视立体匹配 泊松表面重建 三维重建 三维城市模型
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Efficient and stable all-inorganic Sb_(2)(S,Se)_(3)solar cells via manipulating energy levels in MnS hole transporting layers 被引量:1
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作者 Shaoying Wang Yuqi Zhao +5 位作者 Liquan Yao Chuang Li Junbo Gong Guilin Chen Jianmin Li Xudong Xiao 《Science Bulletin》 SCIE EI CSCD 2022年第3期263-269,共7页
The use of organic hole transport layer(HTL)Spiro-OMeTAD in various solar cells imposes serious stabil-ity and cost problems,and thus calls for inorganic substitute materials.In this work,a novel inorganic MnS film pr... The use of organic hole transport layer(HTL)Spiro-OMeTAD in various solar cells imposes serious stabil-ity and cost problems,and thus calls for inorganic substitute materials.In this work,a novel inorganic MnS film prepared by thermal evaporation has been demonstrated to serve as a decent HTL in high-performance Sb_(2)(S,Se)_(3)solar cells,providing a cost-effective all-inorganic solution.A low-temperature air-annealing process for the evaporated MnS layer was found to result in a significant positive effect on the power conversion efficiency(PCE)of Sb_(2)(S,Se)_(3)solar cells,due to its better-matched energy band alignment after partial oxidation.Impressively,the device with the optimized MnS HTL has achieved an excellent PCE of about 9.24%,which is the highest efficiency among all-inorganic Sb_(2)(S,Se)_(3)solar cells.Our result has revealed that MnS is a feasible substitute for organic HTL in Sb-based solar cells to achieve high PCE,low cost,and high stability. 展开更多
关键词 Sb^(2)(S Se)_(3) All-inorganic Solar cells MNS Hole transporting layer
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Self-referent phenotype matching and its role in female mate choice in arthropods
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作者 Carie B. WEDDLE John HUNT Scott K. SAKALUK 《Current Zoology》 SCIE CAS CSCD 2013年第2期239-248,共10页
A growing body of empirical evidence shows that females of many animal species gain benefits by mating polyan- drously, and often prefer to mate with novel males over previous mates. Although a female preference for n... A growing body of empirical evidence shows that females of many animal species gain benefits by mating polyan- drously, and often prefer to mate with novel males over previous mates. Although a female preference for novel males has been ,demonstrated for multiple animal taxa, the mechanisms used by females to discriminate between novel and previous mates remain largely unknown. However, recent studies suggest that in decorated crickets Gryllodes sigillatus, females actually imbue males with their own chemical cues, known as cuticular hydrocarbons (CHCs) during mating, and utilize chemosensory self-referencing 1:o recognize recent mates. Here we review evidence that self-referent phenotype matching is a widespread mechanism of recogni- tion in arthropods, and explore how CHCs are used to facilitate mate-choice decisions. There is substantial evidence that CHCs are used as recognition cues to discriminate between species, kin, sexes, mates, individuals, and self and non-self, and are used to facilitate mate-choice decisions in a wide range of arthropod taxa. There is also evidence that CHCs are often transferred between individuals during direct physical contact, including copulation. Chemosensory self-referencing via cuticular hydrocarbons could provide a simple, but reliable mechanism for identifying individuals from previous mating encounters. This mechanism does not require any specialized cognitive abilities because an individual's phenotype is always available for reference. Given the ubiqui- tous use of CHCs among arthropods, chemosensory self-referencing may be a widespread mechanism used by female arthropods to facilitate ibmale mate-choice decisions and to enhance opportunities for polyandry [Current Zoology 59 (2): 239-248, 2013]. 展开更多
关键词 POLYANDRY Chemical signals Cuticular hydrocarbons Sexual selection
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