3D Trajectory Extraction from 2D Videos for Human Activity Analysis

Zeyd Boukhers

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Zeyd Boukhers, 3D Trajectory Extraction from 2D Videos for Human Activity Analysis (2017), Logos Verlag, Berlin, ISBN: 9783832592646

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Beschreibung / Abstract

The present dissertation addresses the problem of extracting 3D trajectories of objects from 2D videos. The reason of this is the theory that these trajectories symbolise high-level interpretations of human activities. A 3D trajectory of an object means its sequential positions in the real world over time. To this end, a generic framework for detecting objects and extracting their trajectories is proposed. In simpler terms, it means obtaining the 3D coordinate of the objects detected on the image plane and then tracking them in the real world to extract their 3D trajectories. Lastly, this dissertation presents applications of trajectory analysis to understand human activities in crowded environments. In this context, each phase in the framework represents independent approaches dedicated to solving challenging tasks in computer vision and multimedia.

Inhaltsverzeichnis

  • BEGINN
  • 1 Introduction
  • 1.1 Problem
  • 1.2 Contribution
  • 1.3 Overview
  • 2 RelatedWork
  • 2.1 Object Detection
  • 2.2 Trajectory Extraction
  • 2.3 Camera Parameters Estimation
  • 2.4 Trajectory Analysis
  • 3 Object Detection
  • 3.1 Object Detection in Surveillance Videos
  • 3.2 Object Detection in Still Images
  • 3.3 Summary
  • 4 3D Trajectory Extraction from Surveillance Videos
  • 4.1 Initialisation
  • 4.2 Best Frame Selection
  • 4.3 Particle Filter
  • 4.4 Coordinate Conversion
  • 4.5 Summary
  • 5 3D Trajectory Extraction from Moving Cameras
  • 5.1 Focal Length Estimation
  • 5.2 Object†™s Depth Estimation
  • 5.3 Observation Model
  • 5.4 Motion Model
  • 5.5 Sampling
  • 5.6 Summary
  • 6 Application: Trajectory Analysis
  • 6.1 Convoy Detection
  • 6.2 Suspicious Activity Detection
  • 6.3 Summary
  • 7 Experiments and Results
  • 7.1 Object Detection
  • 7.2 3D Trajectory Extraction
  • 7.3 Camera Parameters Estimation
  • 7.4 Trajectory Analysis
  • 8 Conclusion
  • 8.1 Summary
  • 8.2 FutureWork
  • Abbreviations
  • Mathematical Symbols
  • List of Figures
  • List of Tables
  • List of Algorithms
  • Bibliography
  • Own Publications
  • Curriculum Vitae

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