Paper Info
Title
Detection and Localization of Anomalous Motion in Video Sequences from Local Histograms of Labeled Affine Flows.
Abstract
We propose an original method for detecting and localizing anomalous motion patterns in videos from a camera view -based motion representation perspective. Anomalous motion should be taken in a broad sense, i.e., unexpected, abnormal, singular, irregular, or unusual motion. Identifying distinctive dynamic information at any time point and at any image location in a sequence of images is a key requirement in many situations and applications. The proposed method relies on so-called labeled affine flows (LAF) involving both affine velocity vectors and affine motion classes. At every pixel a motion class is inferred from the affine motion model selected in a set of candidate models estimated over a collection of windows. Then, the image is subdivided in blocks where motion class histograms weighted by the affine motion vector magnitudes are computed. They are compared blockwise to histograms of normal behaviours with a dedicated distance. More specifically, we introduce the local outlier factor (LOF) to detect anomalous blocks. LOF is a local flexible measure of the relative density of data points in a feature space, here the space of LAF histograms. By thresholding the LOF value, we can detect an anomalous motion pattern in any block at any time instant of the video sequence. The threshold value is automatically set in each block by means of statistical arguments. We report comparative experiments on several real video datasets, demonstrating that our method is highly competitive for the intricate task of detecting different types of anomalous motion in videos. Specifically, we obtain very competitive results on all the tested datasets: 99.2 % AUC for UMN, 82.8 % AUC for UCSD, and 95.73 % accuracy for PETS 2009, at the frame level.
Year
Venue
Field
2017
Front. ICT
Affine transformation,Computer vision,Local outlier factor,Affine shape adaptation,Feature vector,Motion field,Computer science,Motion compensation,Artificial intelligence,Thresholding,Motion estimation
DocType
Volume
Citations 
Journal
2017
1
PageRank 
References 
Authors
0.35
55
3
Name
Order
Citations
PageRank
Juan-Manuel Pérez-Rúa110.69
Antoine Basset252.47
Patrick Bouthemy32675286.70