CONTENTS
CONTENTS
Abstract (Chinese) ................................................................................................................... I
Abstract ................................................................................................................................. III
CONTENTS(Chinese) ........................................................................................................... V
CONTENT ........................................................................................................................... VII
Chapter 1 Introduction .......................................................................................................... 1
1.1 The research background and significance of matter ................................................. 1
1.2 Visual SLAM Overview and Research Status ........................................................... 3
1.2.1 Filter Based Visual SLAM Research Status.................................................... 3
1.2.2 Research Status of Visual SLAM Based on Graph Optimization ................... 3
1.3 Loop closure detection overview and research status ................................................ 4
1.3.1 Research Status Based on Artificial Design Features ..................................... 4
1.3.2 Research Status of loop closure detection Based on Deep Learning .............. 5
1.4 The main content of this article .................................................................................. 5
Chapter 2 The principle introduction of visual slam and loop closure detection ........... 7
2.1 Visual slam principle introduction ............................................................................. 7
2.1.1 Sensor .............................................................................................................. 7
2.1.2 Visual odometer .............................................................................................. 9
2.1.3 Behind end of the SLAM framework ............................................................ 11
2.1.4 The construction of SLAM framework ......................................................... 15
2.2 Mathematical expression of SLAM problem ........................................................... 16
2.2.1 Least Squares ................................................................................................. 18
2.2.2 The solution of Least square ......................................................................... 18
2.3 Chapter summary ..................................................................................................... 19
Chapter 3 Loop closue detection based on artificial design features ............................... 20
3.1 Artificial design feature extraction algorithm classification .................................... 20
3.2 Bag-of-Word ............................................................................................................ 22
3.2.1 Dictionary ...................................................................................................... 23
3.2.2 K-means algorithm ..................................................................................... 23
3.3 Loop closure detection experiment based on Bag-of-Word model .......................... 24
3.3.1 The environment of experiment .................................................................... 24
万方数据