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Re: Algorithms for image processing in markerless gait analysis

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  • Re: Algorithms for image processing in markerless gait analysis

    > I am developing a markerless gait analysis system using image processing
    > techniques to locate the joint centres for tracking. I am hoping to achieve
    > this by fitting a simplified model of the leg (literally just four lines in
    > the 2D plane) to the actual footage of the patient's leg. I have managed to
    > successfully pick out the patient from the background of the film clips but
    > I am having trouble actually fitting the model to the footage without manual
    > intervention. I was wondering if anyone has tried this technique before and
    > how they managed this particular problem. I am really looking for source
    > code or algorithms at this stage as I have read several papers on the
    > theory.

    I'm struggling with the same problem even if applied to the whole body.
    I can provide you some links I've found useful.

    Hough transform

    Adrew Blake
    Introduction to Active contours and Visual Dynamics

    Judit Verestóy and Dmitry Chetverikov
    Fearture Point Tracking Algorithms

    Image Processing Fundamentals

    The Condensation Algorithm Home Page

    Jaewon Shin
    CONDENSATION for Visual Tracking

    I think that the techniques that better fits your problem is Condensation.
    Anyway, as you can see some papers are from a site called CVonline. In the
    same site I found a short paper about gait analysi, really interesting
    albeit short. It says that also the computing of Optical Flow is an
    interesting technique to collect info about gait.
    Try this other link too:
    Stan Birchfield
    KLT An implementation of the Kanade-Lucas-Tomasi feature tracker version
    Then on the Intel site you can find a really huge library for image
    processing, completely free and really powerful.
    Hope all this is useful to you.

    Riccardo Trocca
    Laboratory of Musical Informatics
    University of Genoa

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