@InProceedings{AlmeidaJung:2013:ChDeHu,
author = "Almeida, Igor Rodrigues de and Jung, Claudio Rosito",
affiliation = "{Federal University of Rio Grande do Sul} and {Federal University
of Rio Grande do Sul}",
title = "Change detection in human crowds",
booktitle = "Proceedings...",
year = "2013",
editor = "Boyer, Kim and Hirata, Nina and Nedel, Luciana and Silva,
Claudio",
organization = "Conference on Graphics, Patterns and Images, 26. (SIBGRAPI)",
publisher = "IEEE Computer Society",
address = "Los Alamitos",
keywords = "Crowd analysis, Unusual event detection, Video surveillance.",
abstract = "This paper presents a method to detect unusual behavior in human
crowds based on histograms of velocities in world coordinates. A
combination of background removal and optical flow is used to
extract the global motion at each image frame, discarding small
motion vectors due artifacts such as noise, non-stationary
background pixels and compression issues. Using a calibrated
camera, the global motion can be estimated, and it is used to
build a 2D histogram containing information of speed and direction
for all frames. Each frame is compared with a set of previous
frames by using a histogram comparison metric, resulting in a
similarity vector. This vector is then used to determine changes
in the crowd behavior, also allowing a classification based on the
nature of the change in time: short or long-term changes. The
method was tested on publicly available datasets involving crowded
scenarios.",
conference-location = "Arequipa, Peru",
conference-year = "5-8 Aug. 2013",
doi = "10.1109/SIBGRAPI.2013.18",
url = "http://dx.doi.org/10.1109/SIBGRAPI.2013.18",
language = "en",
ibi = "8JMKD3MGPBW34M/3EDLD6H",
url = "http://urlib.net/ibi/8JMKD3MGPBW34M/3EDLD6H",
targetfile = "PID2848451.pdf",
urlaccessdate = "2024, May 01"
}