Automation enhancement and accuracy investigation of a portable single-camera gait analysis system

C. Yang, U.C. Ugbolue, D. McNicol, V. Stankovic, L. Stankovic, A. Kerr, B. Carse, K.T. Kaliarntas, P.J. Rowe

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)
    150 Downloads (Pure)


    While optical motion analysis systems can provide high-fidelity gait parameters, they are usually impractical for local clinics and home use, due to high cost, requirement for large space, and lack of portability. In this study, we focus on a cost-effective and portable, single-camera gait analysis solution, based on video acquisition with calibration, autonomous detection of frames-of-interest,
    Kalman-filter+Structural-Similarity-based marker tracking, and autonomous knee angle calculation. The proposed system is tested using 15 participants, including 10 stroke patients and 5 healthy volunteers. The evaluation of autonomous frames-of-interest detection shows only 0.2% difference between the frame number of the detected frame compared to the frame number of the manually labelled ground truth frame, and thus can replace manual labelling. The system is validated against a gold standard optical motion analysis system, using knee angle accuracy as metric of assessment. The accuracy investigation between the RGBand the grayscale-video marker tracking schemes shows that the grayscale system suffers from negligible accuracy loss with a significant processing speed advantage. Experimental results demonstrate that the proposed system can automatically estimate the knee angle, with R-squared value larger than 0.95 and Bland-Altman plot results smaller than 3.0127 degrees mean error.
    Original languageEnglish
    Pages (from-to)563-571
    Number of pages9
    JournalIET Science, Measurement & Technology
    Issue number4
    Early online date21 Jan 2019
    Publication statusPublished - 1 Jun 2019


    Dive into the research topics of 'Automation enhancement and accuracy investigation of a portable single-camera gait analysis system'. Together they form a unique fingerprint.

    Cite this