Fuzzy Inference Based Pre-impact Fall Detection System Using Dynamic Threshold

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Nuth Otanasap
Poonpong Boonbrahm

Abstract

Problems of falling are particularly vital safety in seniors. For these reasons, increasing a useful fall prevention approach is necessary to relieve the infliction of falls. This study focuses on a dynamic threshold model for real-time pre-impact fall detection that enables the falls to be identified before the body crashes to the ground. The velocity of head and chest position and the center of gravity of the subject body used for the feature combination classified by fuzzy inference for pre-impact fall detection. It only needs subjects to wear some tiny coin-size sensors that combine with the Kinect sensor, vision-based, without recording any data due to privacy issue. The dynamic threshold-based model with stereotypes suitable for an individual one, is applied for real-time fall and non-fall classification for the longest lead time of
pre-impact fall detection. Moreover, the various kinds of integration of single, multiple, and triple Kinect combined with and without the wearable device are evaluated. The 14 rules of Sugeno fuzzy set defining the falling posture, movement transitions, and comparison of the different combination of devices are inferred first, whereas the final decision is produced through thinking and trigger on such fuzzy sets. The experimentation result found that the highest lead-time of pre-impact fall detection is 549.83 ms. However, the integration method that combined multiple Kinect with the wearable device can reduce camera overlapping and obscurity with the highest accuracy about 98.09 percent. Vice versa, the method using only multiple Kinect without the wearable device provide lower accuracy than 93.00 percent.

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References

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