title: A novel method for synchronizing motion capture with other data sources for millisecond-level precision.
abstract: Synchronization of multiple data collection systems is necessary for accurate temporal alignment of data, and is particularly important when considering rapid movements which occur in less than one second. This paper describes a novel method for synchronizing multiple data collection instruments including load cells and a motion capture system, using a common analog signal. An application of the synchronization method is demonstrated using biomechanical data collected during a rapid reach-to-grasp reaction, where data from motion capture and load cells are collected. Results are provided to validate and demonstrate the accuracy of the synchronization of motion capture with other data collection systems. During the reach-to-grasp trials, delays between the data collection systems ranged from 4ms to 235ms. The large range and variability in delay times between trials highlights the need for synchronization on a continual basis, rather than application of an average or constant value to correct for time delays between systems.
authors.affiliation: iDAPT Centre for Rehabilitation Research, Toronto Rehabilitation Institute - University Health Network, 550 University Ave, Toronto, ON M5G 2A2, Canada(1); Institute of Biomaterials and Biomedical Engineering, University of Toronto, 164 College Street, Toronto, ON, M5S 3G9, Canada.
authors.forename: V
authors.initials: V
authors.lastname: Komisar
authors.affiliation: iDAPT Centre for Rehabilitation Research, Toronto Rehabilitation Institute - University Health Network, 550 University Ave, Toronto, ON M5G 2A2, Canada(1); Department of Occupational Sciences and Occupational Therapy, University of Toronto, 500 University Ave, Toronto, ON, M5G 1V7, Canada; Faculty of Kinesiology and Physical Education, University of Toronto, 55 Harbord St, Toronto, ON, M5S 2W6, Canada.
authors.forename: A C
authors.initials: AC
authors.lastname: Novak
authors.affiliation: iDAPT Centre for Rehabilitation Research, Toronto Rehabilitation Institute - University Health Network, 550 University Ave, Toronto, ON M5G 2A2, Canada(1). Electronic address: bruce.haycock@uhn.ca.
authors.forename: B
authors.initials: B
authors.lastname: Haycock
mesh_terms: D001696:Biomechanical Phenomena; D002138:Calibration; D004867:Equipment Design; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D016247:Information Storage and Retrieval; D008297:Male; D009038:Motion; D010865:Pilot Projects; D004856:Postural Balance; D012815:Signal Processing, Computer-Assisted; D055815:Young Adult
keywords: Data synchronization; Kinematics; Kinetics; Motion capture