Accurate positioning is one of the essential requirements for numerous applications of remote sensing data,especially in the event of a noisy or unreliable satellite signal.Toward this end,we present a novel framework...Accurate positioning is one of the essential requirements for numerous applications of remote sensing data,especially in the event of a noisy or unreliable satellite signal.Toward this end,we present a novel framework for aircraft geo-localization in a large range that only requires a downward-facing monocular camera,an altimeter,a compass,and an open-source Vector Map(VMAP).The algorithm combines the matching and particle filter methods.Shape vector and correlation between two building contour vectors are defined,and a coarse-to-fine building vector matching(CFBVM)method is proposed in the matching stage,for which the original matching results are described by the Gaussian mixture model(GMM).Subsequently,an improved resampling strategy is designed to reduce computing expenses with a huge number of initial particles,and a credibility indicator is designed to avoid location mistakes in the particle filter stage.An experimental evaluation of the approach based on flight data is provided.On a flight at a height of 0.2 km over a flight distance of 2 km,the aircraft is geo-localized in a reference map of 11,025 km~2using 0.09 km~2aerial images without any prior information.The absolute localization error is less than 10 m.展开更多
SLAM(simultaneous localization and mapping)是无人载体实现自主导航定位的关键技术。针对传统视觉SLAM系统在动态场景下导航定位精度低的问题,在视觉SLAM系统的基础上引入惯性传感器(inertial measure-ment unit)。在ORB-SLAM3系统...SLAM(simultaneous localization and mapping)是无人载体实现自主导航定位的关键技术。针对传统视觉SLAM系统在动态场景下导航定位精度低的问题,在视觉SLAM系统的基础上引入惯性传感器(inertial measure-ment unit)。在ORB-SLAM3系统的基础上设计了一种面向动态环境的视觉惯性SLAM系统。提出一种基于向量场一致性(vector field consensus,VFC)的稀疏光流法来追踪图像的特征点并计算基础矩阵,分别利用光流对极几何约束和惯性传感器信息计算特征点的动态概率,提出一种联合的动态特征检测方法计算特征点的总动态概率,并将动态概率大于阈值的特征点进行剔除,在SLAM系统的前端实现了视觉信息与惯性运动信息的紧耦合。在数据集上的实验结果表明,该视觉惯性SLAM改进算法有良好的性能表现。展开更多
By using an existence theorems of maximal elements for a family of set-valued mappings in G-convex spaces due to the author, some new nonempty intersection theorems for a family of set-valued mappings were established...By using an existence theorems of maximal elements for a family of set-valued mappings in G-convex spaces due to the author, some new nonempty intersection theorems for a family of set-valued mappings were established in noncompact product G-convex spaces. As applications, some equilibrium existence theorems for a system of generalized vector equilibrium problems were proved in noncompact product G-convex spaces. These theorems unify, improve and generalize some important known results in literature.展开更多
文摘Accurate positioning is one of the essential requirements for numerous applications of remote sensing data,especially in the event of a noisy or unreliable satellite signal.Toward this end,we present a novel framework for aircraft geo-localization in a large range that only requires a downward-facing monocular camera,an altimeter,a compass,and an open-source Vector Map(VMAP).The algorithm combines the matching and particle filter methods.Shape vector and correlation between two building contour vectors are defined,and a coarse-to-fine building vector matching(CFBVM)method is proposed in the matching stage,for which the original matching results are described by the Gaussian mixture model(GMM).Subsequently,an improved resampling strategy is designed to reduce computing expenses with a huge number of initial particles,and a credibility indicator is designed to avoid location mistakes in the particle filter stage.An experimental evaluation of the approach based on flight data is provided.On a flight at a height of 0.2 km over a flight distance of 2 km,the aircraft is geo-localized in a reference map of 11,025 km~2using 0.09 km~2aerial images without any prior information.The absolute localization error is less than 10 m.
文摘SLAM(simultaneous localization and mapping)是无人载体实现自主导航定位的关键技术。针对传统视觉SLAM系统在动态场景下导航定位精度低的问题,在视觉SLAM系统的基础上引入惯性传感器(inertial measure-ment unit)。在ORB-SLAM3系统的基础上设计了一种面向动态环境的视觉惯性SLAM系统。提出一种基于向量场一致性(vector field consensus,VFC)的稀疏光流法来追踪图像的特征点并计算基础矩阵,分别利用光流对极几何约束和惯性传感器信息计算特征点的动态概率,提出一种联合的动态特征检测方法计算特征点的总动态概率,并将动态概率大于阈值的特征点进行剔除,在SLAM系统的前端实现了视觉信息与惯性运动信息的紧耦合。在数据集上的实验结果表明,该视觉惯性SLAM改进算法有良好的性能表现。
文摘By using an existence theorems of maximal elements for a family of set-valued mappings in G-convex spaces due to the author, some new nonempty intersection theorems for a family of set-valued mappings were established in noncompact product G-convex spaces. As applications, some equilibrium existence theorems for a system of generalized vector equilibrium problems were proved in noncompact product G-convex spaces. These theorems unify, improve and generalize some important known results in literature.
