A video-based system for acquiring biomechanical data synchronized with arbitrary events and activities

A video-based data acquisition and interactive multimedia data extraction system are described for measuring and synchronizing large quantities of biomechanical analog data with arbitrary events and activities. Analog signals from up to 32 channels are digitized, frequency-shift key (FSK) coded, and...

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Bibliographic Details
Published in:IEEE transactions on biomedical engineering 1995-09, Vol.42 (9), p.944-948
Main Authors: Yen, T.Y., Radwin, R.G.
Format: Article
Language:English
Subjects:
Analog-Digital Conversion
Bandwidth
Bioinformatics
Biological and medical sciences
Biomechanical Phenomena
Biophysics - instrumentation
Computer Peripherals
Data acquisition
Data Collection - instrumentation
Data mining
Equipment Design
Ergonomics
Frequency shift keying
Frequency synchronization
Humans
Medical sciences
Microcomputers
Modems
Multimedia systems
Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects)
Technology. Biomaterials. Equipments. Material. Instrumentation
Videotape Recording - instrumentation
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Summary:A video-based data acquisition and interactive multimedia data extraction system are described for measuring and synchronizing large quantities of biomechanical analog data with arbitrary events and activities. Analog signals from up to 32 channels are digitized, frequency-shift key (FSK) coded, and recorded directly onto the audio tracks of a video tape in synchronization with the video information. The data acquisition system includes an A/D converter that digitizes up to 16 multiplexed channels of 8-b data at a fixed sample rate between 60 and 960 Hz, and an FSK modem that transfers the data onto one of two VHS high fidelity (20 Hz-20 kHz bandwidth) audio tracks. Twenty megabytes of digitized data and time codes, along with associated video and normal audio are contained on a conventional 120-min video tape. An analyst interactively reviews the video tape off-line using a computer-controlled VCR and identifies specific events that divide arbitrary activities into time segments. The computer automatically extracts the biomechanical data corresponding to each time segment for further processing or analysis. This system is useful for ergonomics, gait analysis, sports medicine, sleep laboratory, biomechanics, or any application where complex visual events are synchronized with low-frequency analog data.< >
ISSN:0018-9294
1558-2531
DOI:10.1109/10.412663