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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Diraco, G. Leone, A. Siciliano, P. |
| Copyright Year | 2010 |
| Description | Author affiliation: CNR-IMM, Via Monteroni, presso Campus Universitario, Palazzina A3 - 73100 Lecce, Italy (Diraco, G.; Leone, A.; Siciliano, P.) |
| Abstract | The paper presents an active vision system for the automatic detection of falls and the recognition of several postures for elderly homecare applications. A wall-mounted Time-Of-Flight camera provides accurate measurements of the acquired scene in all illumination conditions, allowing the reliable detection of critical events. Preliminarily, an off-line calibration procedure estimates the external camera parameters automatically without landmarks, calibration patterns or user intervention. The calibration procedure searches for different planes in the scene selecting the one that accomplishes the floor plane constraints. Subsequently, the moving regions are detected in real-time by applying a Bayesian segmentation to the whole 3D points cloud. The distance of the 3D human centroid from the floor plane is evaluated by using the previously defined calibration parameters and the corresponding trend is used as feature in a thresholding-based clustering for fall detection. The fall detection shows high performances in terms of efficiency and reliability on a large real dataset in which almost one half of events are falls acquired in different conditions. The posture recognition is carried out by using both the 3D human centroid distance from the floor plane and the orientation of the body spine estimated by applying a topological approach to the range images. Experimental results on synthetic data validate the correctness of the proposed posture recognition approach. |
| Starting Page | 1536 |
| Ending Page | 1541 |
| File Size | 1026005 |
| Page Count | 6 |
| File Format | |
| ISBN | 9781424470549 |
| ISSN | 15301591 |
| e-ISBN | 9783981080162 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2010-03-08 |
| Publisher Place | Germany |
| Access Restriction | Subscribed |
| Rights Holder | European Design Automation Association (EDAA) |
| Subject Keyword | Machine vision Senior citizens Medical services Calibration Cameras Layout Event detection Humans Lighting Bayesian methods plane detection Fall detection posture recognition range imaging self-calibration |
| Content Type | Text |
| Resource Type | Article |
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