title: Sensor data acquisition and processing parameters for human activity classification.
abstract: It is known that parameter selection for data sampling frequency and segmentation techniques (including different methods and window sizes) has an impact on the classification accuracy. For Ambient Assisted Living (AAL), no clear information to select these parameters exists, hence a wide variety and inconsistency across today's literature is observed. This paper presents the empirical investigation of different data sampling rates, segmentation techniques and segmentation window sizes and their effect on the accuracy of Activity of Daily Living (ADL) event classification and computational load for two different accelerometer sensor datasets. The study is conducted using an ANalysis Of VAriance (ANOVA) based on 32 different window sizes, three different segmentation algorithm (with and without overlap, totaling in six different parameters) and six sampling frequencies for nine common classification algorithms. The classification accuracy is based on a feature vector consisting of Root Mean Square (RMS), Mean, Signal Magnitude Area (SMA), Signal Vector Magnitude (here SMV), Energy, Entropy, FFTPeak, Standard Deviation (STD). The results are presented alongside recommendations for the parameter selection on the basis of the best performing parameter combinations that are identified by means of the corresponding Pareto curve.
authors.affiliation: School of Engineering, University of Portsmouth, Anglesea Building, Anglesea Road, Portsmouth PO1 3DJ, UK. Sebastian.Bersch@port.ac.uk.
authors.forename: Sebastian D
authors.initials: SD
authors.lastname: Bersch
authors.affiliation: School of Engineering, University of Portsmouth, Anglesea Building, Anglesea Road, Portsmouth PO1 3DJ, UK. Djamel.Azzi@port.ac.uk.
authors.forename: Djamel
authors.initials: D
authors.lastname: Azzi
authors.affiliation: School of Engineering, University of Portsmouth, Anglesea Building, Anglesea Road, Portsmouth PO1 3DJ, UK. Rinat.Khusainov@port.ac.uk.
authors.forename: Rinat
authors.initials: R
authors.lastname: Khusainov
authors.affiliation: School of Engineering, University of Portsmouth, Anglesea Building, Anglesea Road, Portsmouth PO1 3DJ, UK. ifeyinwaeucharia@gmail.com.
authors.forename: Ifeyinwa E
authors.initials: IE
authors.lastname: Achumba
authors.affiliation: Portsmouth Business School, University of Portsmouth, Richmond Building, Portland Street, Portsmouth PO1 3DE, UK. Jana.Ries@port.ac.uk.
authors.forename: Jana
authors.initials: J
authors.lastname: Ries
mesh_terms: D000203:Activities of Daily Living; D000465:Algorithms; D000704:Analysis of Variance; D040561:Assisted Living Facilities; D006802:Human Activities / Q000145:classification*; D006801:Humans; D012815:Signal Processing, Computer-Assisted; D013686:Telemetry / Q000295:instrumentation*