Smartphone Motion Mode Recognition †
2.2. Smartphone Sensors
2.3. Feature Extraction
2.3.1. Statistical Features
- Mean. The mean of a signal.
- Median. The median is the middle value separating the higher half of a data sample from the lower half.
- Standard deviation. The square root of the variance (measure of the spread of data around the mean).
- Average absolute difference. Measure of the spread of data around its mean, taking the absolute difference between values and the mean.
- Interquartile range (iqr). It is the difference between 75th percentile and 25th percentile of the data where percentile of is the value separating the higher 100- of a data sample from the lower of the data.
- Skewness. A measure of the asymmetry of the probability distribution of a signal.
- Kurtosis. A measure of the ‘tailedness’ of the probability distribution of a signal.
- Signal energy. The sum of the squares of signal values.
- Signal magnitude area. The sum of absolute values of a signal.
- Max. The maximum value in the window of the signal.
- Min. The minimum value in the window of the signal.
- Amplitude. The absolute difference between the maximum value and minimum value.
2.3.2. Time-Domain Features
- Number of peaks. The count of the number of maximum points within the desired window of the signal where the maximum points should be above a predefined value and located after w samples from the last maximum point.
2.3.3. Cross Sensor Features
- Gyro-Accelerometer Correlation. Is the cross-correlation coefficient between the gyro and acceleration sensors.
- Gyro-Accelerometer Maximum. The multiplication result of the gyro and acceleration maximum values.
- Gyro-Accelerometer Standard Deviation. The multiplication result of the gyro and acceleration standard deviation values.
3. Experimental Results and Discussion
3.1. Experimental Setup
3.2. The Learning Process
Conflicts of Interest
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Klein, I.; Solaz, Y.; Ohayon, G. Smartphone Motion Mode Recognition. Proceedings 2018, 2, 145. https://doi.org/10.3390/ecsa-4-04929
Klein I, Solaz Y, Ohayon G. Smartphone Motion Mode Recognition. Proceedings. 2018; 2(3):145. https://doi.org/10.3390/ecsa-4-04929Chicago/Turabian Style
Klein, Itzik, Yuval Solaz, and Guy Ohayon. 2018. "Smartphone Motion Mode Recognition" Proceedings 2, no. 3: 145. https://doi.org/10.3390/ecsa-4-04929