Abnormal event detection and localisation in traffic videos based on group sparse topical coding

P Ahmadi, M Tabandeh, I Gholampour - IET Image Processing, 2016 - Wiley Online Library
In visual surveillance, detecting and localising abnormal events are of great interest. In this
study, an unsupervised method is proposed to automatically discover abnormal events …

A new method for traffic density estimation based on topic model

R Kaviani, P Ahmadi… - 2015 Signal Processing …, 2015 - ieeexplore.ieee.org
Traffic density estimation plays an integral role in intelligent transportation systems (ITS),
using which provides important information for signal control and effective traffic …

Modeling traffic motion patterns via non-negative matrix factorization

P Ahmadi, R Kaviani, I Gholampour… - … Conference on Signal …, 2015 - ieeexplore.ieee.org
Analyzing motion patterns in traffic videos can directly lead to generate some high-level
descriptions of the video content. In this paper, an unsupervised method is proposed to …

Union of low‐rank subspaces detector

M Joneidi, P Ahmadi, M Sadeghi… - IET Signal …, 2016 - Wiley Online Library
The problem of signal detection using a flexible and general model is considered. Owing to
applicability and flexibility of sparse signal representation and approximation, it has attracted …

Analyzing multiple types of behaviors from traffic videos via nonparametric topic model

H Zhou, H Yu, R Hu, G Zhang, J Hu, T He - Journal of Visual …, 2019 - Elsevier
Intelligent video surveillance systems have garnered substantial research attention in recent
years within the transportation surveillance field. The systems can assist in identifying …

Temporal segmentation of traffic videos based on traffic phase discovery

P Ahmadi, R Kaviani, I Gholampour… - NOMS 2016-2016 …, 2016 - ieeexplore.ieee.org
In this paper, the topic model is adopted to learn traffic phases from video sequence. Phase
detection is applied to determine where a video clip is in the traffic light sequence. Each …

Beyond bag-of-words: An improved Sparse Topical Coding for learning motion patterns in traffic scenes

P Ahmadi, M Tabandeh… - 2015 9th Iranian …, 2015 - ieeexplore.ieee.org
Analyzing motion patterns in traffic videos can directly generate some high-level
descriptions of the video content which can be further employed in rule mining and …