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. 2015 Jan 7;15(1):932–964. doi: 10.3390/s150100932

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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Figure 3. — (a) A sample of Motion Energy Image (MEI); (b) A sample of Motion History Image (MHI); (c) An example of Motion Silhouettes Image (MSI); (d) An example of Gait Energy Image (GEI); (e) An example of Gait History Image (GHI); (f) The forward Single-step History Image (fSHI) sample; (g) The backward Single-step History Image (bSHI) sample; (h) The Active Energy Image (AEI) sample in normal state; (i) The AEI sample walking with bag; (j) The AEI sample walking on coat.