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There is a niche field of study concerning detection of fallen persons, so there are some references, though I don't know of a cascade classifier ready to go, you'll likely need to train your own (and Haar is considered inferior to traincascade now);
Detecting falls and poses in image silhouettes http://publications.lib.chalmers.se/records/fulltext/178169/178169.pdf
This next reference should apply directly to your need;
Fallen Person Detection for Mobile Robots using 3D Depth Data http://www.tu-ilmenau.de/fileadmin/media/neurob/publications/conferences_int/2013/Volkhardt-SMC-2013c.pdf
| | 2 | grammar |
There is a niche field of study concerning detection of fallen persons, so there are some available references, though I don't know of a cascade classifier ready to go, you'll go. You'll likely need to train your own (and Haar is considered inferior to traincascade now);
Detecting falls and poses in image silhouettes http://publications.lib.chalmers.se/records/fulltext/178169/178169.pdf
This next reference should apply directly to your need;
Fallen Person Detection for Mobile Robots using 3D Depth Data http://www.tu-ilmenau.de/fileadmin/media/neurob/publications/conferences_int/2013/Volkhardt-SMC-2013c.pdf
