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Summary of previous COACH systems. |
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| COACH Version |
Tracking System |
Decision-making system |
Prompting system |
Number of Subjects* |
Related Publications |
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| Version 1 |
Pattern wristband worn by the user |
Neural networks interacting with a hard-coded taxonomy |
Audio prompts, with one prompt for each step |
10 |
[22,33] |
| Version 2 |
Using background subtraction to isolate the user's hands. Tracking of hands and task objects (i.e. soap and towel) using a preset colour model. |
Fully observable Markov decision process (MDP). This technique assumes the world is fully observable; it does not take into account hidden variables, such as user responsiveness. |
Audio prompts with three levels of assistance (minimal, moderate, and maximal) for each step. |
4 |
[20,37-39] |
| Version 3 (system presented in this paper) |
Colour based flocking. |
[Belief monitoring system & policy] Partially observable Markov decision process (POMDP). This model takes into account hidden variables and is able to make decisions in conditions of uncertainty. |
Audio and audio-video prompts with three levels of assistance (minimal, maximal, and maximal + video demonstration) for each step. Encouragement and a reminder regarding the activity the user is attempting added. Professional actor recorded prompts. |
6 |
[18,19,21,23,25] |
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* Results from previous trials are not presented as they are not comparable because of the variance in the technologies and procedures that were used. | |||||
Mihailidis et al. BMC Geriatrics 2008 8:28 doi:10.1186/1471-2318-8-28 |
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