Table 3.
Phones, activities and data features used in online activity recognition.
| Study | Activities | Data Features | Phone |
|---|---|---|---|
| [38] | A1, A2, A3, A5 | mean, SD, number of peaks | Nokia N95 |
| [41] | A1, A5, A8, A9, A10 | A's mean, VAR, FFT coefficients and GPS speed | Android Phone, Nokia N95 |
| [42] | A1, A5, A8, A11 | SD (based on accelerometer magnitude) | Nokia N95 |
| [60] | A1, A2, A3, A6, A9, A16, A17, phone in hand, typing text messages; talking on the phone | mean, VAR | OpenMoko Neo Freerunner |
| [51] | A1, A5, A6, A7, A12, A17, Idle | Fundamental frequency, average acceleration, max and min amplitude (based on accelerometer magnitude) | Motorola Droid |
| [36] | A1, A5, A8, A9, A11 | mean, VAR, mean crossing rate, spectrum peak, sub-band energy, sub-band energy ratio, spectral entropy | Nokia N95, iPhone |
| [32] | A1, A5, A8, A9, A11 | A's VAR, DFFTcomponents and GPS speed | Nokia N95 |
| [45] | A1, A4, A5, A12 | similarity score using geometric template matching algorithm | Android phones |
| [31] | A1, A5, A8, A10 | mean, VAR | Android Nexus One |
| [54] | A1, A2, A3, A5, A6 | mean, root mean square, difference between max and min values | Android phones |
| [55] | Different physical activities | maximum and minimum euclidean norm | ZTE Blade |
| [59] | A1, A2, A3, A4, A5, A9 | signal magnitude, coefficient of variance, counts per minute | Samsung Galaxy S |
| [50] | A1, A2, A3, A5 | mean, min, max, SD | Samsung Galaxy Gio |
| [34] | A1, A3, A5 | mean, VAR, SD, correlation between axes, inter-quartile range, mean absolute deviation, root mean square and energy | HTC Evo 4G |
| [35] | A1, A2, A3, A5, A6, A7, A9, A10, A12, A16 (prone, supine) | mean (axis, magnitude), SD (axis, magnitude), tilt, linear regression coefficients, wavelet coefficients | HTC G11, Samsung i909 |
| [48] | A1, A5, A15, A16, WD, IR, BT, HD, FTT, BRD, unknown | A's VAR, MFCC (Mel-frequency cepstral coefficient), RMS (root mean square), ZCR (zero-crossing rate) as acoustic features. | Android phone |
| [40] | A1, A2, A4, A6, A7 | peak, SD/mean, FFT energy | HTC Hero |
| [52] | A1, A2, A3, A5, A9, A10 | 21 features, including mean, SD, min, max, 5 different percentiles and observations below/above these percentiles | Samsung Galaxy Mini, Nokia N8 |
| [49] | A1, A1 (power), A4, A8 | For details, refer to [49] | iPhone |
| [43] | A1 (slow), A2, A3 (relax, normal), A7, A13, A14 | Mean, VAR, magnitude, covariance, FFT energy and entropy | Nokia N95, Samsung Galaxy S2 |
| [44] | A1, A2, A3, A6, A7, A16 | For details, refer to [44] | Samsung Galaxy S2 |
| [33] | A1, A5, A6, A7, A8, A9, A10 | 9 features based on the auto-correlation function of accelerometer signals | Samsung Galaxy Y |
| [58] | A1, A2, A5, A6, A7, A12 | Auto-regressive coefficients | LG Nexus 4 |
| [47] | A1, A5, A6, A7, A8 | SD and auto-regressive fitting of y-axis, correlation of x, y, z, signal magnitude area, mean, SD and skewness of the pitch | Android smartphone |
| [37] | A1(slow, normal, rush), A2, A3, A5 | Mean, VAR, zero crossing rate, 75th percentile, correlation, inter-quartile, signal energy, power spectrum centroid, FFT energy, frequency-domain entropy | Google Nexus S |
| [39] | A1, A2, A3, A5, A9, A10, A17 | SD, min, max, the remainder between percentiles (10, 25, 75, 90), median, the sum, square sum and number of crossings of values above or below the percentile (10, 25, 75 and 90) | Nokia N8, Samsung Galaxy Mini |
| [53] | A1, A2, A3, A5, A12, A16 | mean, SD | iPhone 4S |
| [56] | A1, A4, A6, A7, A9 | time gap peaks, mean, SD, A's energy, Hjorth mobility and complexity | HTC Nexus |
| [57] | A1, A4, A6, A7, A8, A9, A13, A14 | Average period, VAR, average energy, binned distribution for each axis and correlation between y and z | Samsung Nexus S |
| [46] | A1, A5, A1/A5 on treadmill, A6, A7, A9, A10, A11, A12, A13, A14, A15, idle (A2/A3), watching TV | mean, SD, correlation, signal magnitude area, auto-regressive and moving average coefficients for A; altitude difference for pressure sensor; mean, VAR, min and max for audio sensor | LG NEXUS 4 |
Activities: walking, A1; standing, A2; sitting, A3; jogging, A4; running, A5; walking upstairs, A6; walking downstairs, A7; still, A8; biking, A9; driving a car, A10; in vehicle, A11; jumping, A12; using elevator up, A13; using elevator down, A14; vacuuming, A15; laying, A16; phone on table/detached, A17; washing dishes, WD; ironing, IR; brushing teeth, BT; hair drying, HD; flushing the toilet, FTT; boarding, BD; unknown