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2015 ; 10
(4
): e0124414
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
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English Wikipedia
Feature selection for wearable smartphone-based human activity recognition with
able bodied, elderly, and stroke patients
#MMPMID25885272
Capela NA
; Lemaire ED
; Baddour N
PLoS One
2015[]; 10
(4
): e0124414
PMID25885272
show ga
Human activity recognition (HAR), using wearable sensors, is a growing area with
the potential to provide valuable information on patient mobility to
rehabilitation specialists. Smartphones with accelerometer and gyroscope sensors
are a convenient, minimally invasive, and low cost approach for mobility
monitoring. HAR systems typically pre-process raw signals, segment the signals,
and then extract features to be used in a classifier. Feature selection is a
crucial step in the process to reduce potentially large data dimensionality and
provide viable parameters to enable activity classification. Most HAR systems are
customized to an individual research group, including a unique data set, classes,
algorithms, and signal features. These data sets are obtained predominantly from
able-bodied participants. In this paper, smartphone accelerometer and gyroscope
sensor data were collected from populations that can benefit from human activity
recognition: able-bodied, elderly, and stroke patients. Data from a consecutive
sequence of 41 mobility tasks (18 different tasks) were collected for a total of
44 participants. Seventy-six signal features were calculated and subsets of these
features were selected using three filter-based, classifier-independent, feature
selection methods (Relief-F, Correlation-based Feature Selection, Fast
Correlation Based Filter). The feature subsets were then evaluated using three
generic classifiers (Naïve Bayes, Support Vector Machine, j48 Decision Tree).
Common features were identified for all three populations, although the stroke
population subset had some differences from both able-bodied and elderly sets.
Evaluation with the three classifiers showed that the feature subsets produced
similar or better accuracies than classification with the entire feature set.
Therefore, since these feature subsets are classifier-independent, they should be
useful for developing and improving HAR systems across and within populations.