Planning ahead for PTZ camera assignment and handoff

Abstract

Abstract-We present a visual sensor network, comprising wide field-of-view (FOV) passive cameras and pan/tilt/zoom (PTZ) active cameras, which automatically captures high quality surveillance video of selected pedestrians during their prolonged presence in an area of interest. A wide-FOV static camera can track multiple pedestrians, while any PTZ active camera can follow a single pedestrian at a time. The proactive control of multiple PTZ cameras is required to record seamless, high quality video of a roaming individual despite the observational constraints of the different cameras. We formulate PTZ camera assignment and handoff as a planning problem whose solution achieves optimal camera assignment with respect to predefined observational goals.

Large-scale surveillance system: detection and tracking of suspicious motion patterns in crowded traffic scenes

“…A valued work has been done by [4] as continuity of their previous papers [23,24,25]. They presented a proactive and deliberative planning strategy for intelligently managing a network of active PTZ cameras so as to satisfy the challenging task of capturing close-up biometric videos of selected pedestrians during their prolonged presence in a virtual train station environment under surveillance.…”

“…To expand the surveillance area and provide multiple view information, we were inspired from the works done by [4] to adapt and improve a weighted Round-Robin scheduling scheme to simulate a camera network model with overlapping fields of view to track suspicious vehicles during their spatio-temporal evolution in the scene. The camera network is populated with a set of wide fieldof-view (FOV) passive cameras and active (PTZ) cameras.…”

“…To satisfy these requirements, we propose an adaptation and an improvement in the weighted Round-Robin scheduling scheme, performed by [4], with a particular interest in obtaining high-quality close-up videos of suspicious vehicles for performing number plate recognition or road-hogs identification tasks.…”

“…Here, we opted for combining passive and active cameras in a master-slave setup [4], where detection and tracking information obtained from the fixed cameras is used to automatically control one or more nearby PTZ cameras.…”

“…Selecting camera can be seen as an optimization [3] or as a scheduling problem [4], where the goal is to maximize the visibility of the features or events of interest while minimizing inter-camera switching. This has been an active area of research and many approaches have been proposed in both configurations: distributed and centralized.…”