We investigate the unsupervised K-means clustering and the semi-supervised hidden Markov model (HMM) to automatically detect anomalous motion patterns in groups of people (crowds). Anomalous motion patterns are typically people merging into a dense group, followed by disturbances or threatening situations within the group. The application of K-means clustering and HMM are illustrated with datasets from four surveillance scenarios. The results indicate that by investigating the group of people in a systematic way with different K values, analyze cluster density, cluster quality and changes in cluster shape we can automatically detect anomalous motion patterns. The results correspond well with the events in the datasets. The results also indicate that very accurate detections of the people in the dense group would not be necessary. The clustering and HMM results will be very much the same also with some increased uncertainty in the detections. / <p>Funding Agencies|Vinnova (Swedish Governmental Agency for Innovation Systems) under the VINNMER program||</p>
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:liu-93983 |
| Date | January 2013 |
| Creators | Andersson, Maria, Gustafsson, Fredrik, St-Laurent, Louis, Prevost, Donald |
| Publisher | Linköpings universitet, Reglerteknik, Linköpings universitet, Tekniska högskolan, Swedish Defence Research Agency, Linköping, Sweden, INO, Quebec, Canada, INO, Quebec, Canada, Institute of Electrical and Electronics Engineers (IEEE) |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Article in journal, info:eu-repo/semantics/article, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | IEEE Journal on Selected Topics in Signal Processing, 1932-4553, 2013, 7:1, s. 102-110 |
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