Automation of Tracking Trajectories in a Crowded Situation

Abstract

Studies on pedestrians using microscopic simulation require large amounts of trajectory data from real-world pedestrian crowds. The collection of such data, if done manually, involves tremendous efforts and is very time-consuming. Although many studies have asserted the possibility of automating this task using video cameras, we have found that only a few have demonstrated good performance in very crowded situations or from a top-angled view scene. This paper deals with tracking pedestrian crowd under heavy occlusion and from an angular scene using only a single non-stereo video camera. Our automated tracking system consists of three modules that are performed sequentially. The first module detects moving objects as blobs. The second module computes feature values from the blob information in order to generate what we call a possibility matrix. The third module is a tracking system, which employs a Bayesian update of the probability tree derived from the possibility matrix and from the detection of each pedestrian, in order to track the next position of the pedestrian. The result of such tracking is a database of pedestrian trajectories over time and space. With certain prior information, we show that the system is able to track a large number of people under occlusion and clutter scene.

Collecting pedestrian trajectories

“…Papers like [13][14][15][16][17] all report a false detection rate of more than 10%. Typically the decrease in the false detection rate induces the increase in false positive detections.…”

Development of a predictive safety control algorithm using laser scanners for excavators on construction sites

“…In order to derive possible heading angle changes of workers, various literatures for pedestrian model have been reviewed. Saadat et al 24 under took a detailed survey on previous pedestrian models. Løva˚s 25 presented a stochastic model based on the following assumptions: Any pedestrian facility can be modeled as a network of walkway sections.…”