Large-scale statistical modeling of motion patterns: A Bayesian nonparametric approach
MetadataShow full item record
We propose a novel framework for large-scale scene understanding in static camera surveillance. Our techniques combine fast rank-1 constrained robust PCA to compute the foreground, with non-parametric Bayesian models for inference. Clusters are extracted in foreground patterns using a joint multinomial+Gaussian Dirichlet process model (DPM). Since the multinomial distribution is normalized, the Gaussian mixture distinguishes between similar spatial patterns but different activity levels (eg. car vs bike). We propose a modification of the decayed MCMC technique for incremental inference, providing the ability to discover theoretically unlimited patterns in unbounded video streams. A promising by-product of our framework is online, abnormal activity detection. A benchmark video and two surveillance videos, with the longest being 140 hours long are used in our experiments. The patterns discovered are as informative as existing scene understanding algorithms. However, unlike existing work, we achieve near real-time execution and encouraging performance in abnormal activity detection. © 2012 ACM.
Showing items related by title, author, creator and subject.
An examination of selected upper extremity functional activity from the perspective of the dynamic pattern theory of motor control.Ratanapinunchai, Jonjin (1996)An examination of throwing was performed in a controlled environment with the aim of identifying the control and order parameters of throwing as proposed by dynamic pattern theory. A pilot study was conducted to test the ...
Lim, Tien Tze (2007)Seventy-four methicillin-resistant Staphylococcus aureus (MRSA) from two Malaysian hospitals were characterised by both phenotypic and genotypic techniques. These isolates were collected over an 18 year time period in the ...
Investigation of a management process: An exploratory study to identify underlying patterns in planningDickie, Carolyn (2007)This study linked the management activity of planning with Alexander et al.’s (1977) concept of pattern languages developed within architecture. Since the 1990s the concept has been expanded in the information systems ...