Multi-camera localisation: a review. (1st January 2013) - Raman, Rahul
Past few years have seen exhaustive research in the field of camera localisation. As the era changed from single to multiple cameras, so is the paradigm shift from centralised to distributed algorithms. Euclidean geometry has been explored and the concept of Lie algebra has been touched for more subtle and non-Euclidean details. View overlaps in vision-based algorithms have been optimised and several depth measurement techniques have been implemented to extend the localisation from 2D to 3D space. LED-based techniques like triangulation and LED triangle have given depth measurement alternatives for 3D localisation whereas epipolar geometry has localised cameras with only image information. Multilateration-based approach has used anchor nodes for camera localisation whereas a few distributed algorithms (viz. DALT, DILOC) have used iterations for refinement of estimated locations. As the area under cover increased, wireless network has taken over and many algorithms have been developed for wireless networked cameras. Simultaneous existences of diverse algorithms belonging to different paradigms are needed to meet the requirement of deployment in diverse scenarios. This paper discusses the evolution from the localisation of non-camera equipped sensor network to the smart camera localisation in 3D environment that spans more than a decade.