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Re: Summary: body segments angle calculation using single andpartially calibrated camera

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  • Re: Summary: body segments angle calculation using single andpartially calibrated camera


    The replies you received from BIOMECH-L readers citing various
    ambiguities of the orientation or position of "sticks" with respect to
    the image plane of a single camera left out the simple observation that
    the human body is not a stick. While self occlusions of the human body
    are annoying, in many cases they are not fatal computationally as you
    can fill in the data holes. Clinical gait analysts may reject data
    filling or extrapolation methods out of hand but you may have a
    different audience in mind.

    I suggest you have a look at methods which use additional data to fit
    the projection of the human body pose and movement to a 3D pose. This
    is typically called "markerless video based motion capture". Here are
    some references from a couple of years ago, I'm sure the field has
    advanced since then.

    Aggarwal, J.K. and Q. Cai (1997). Human Motion Analysis: A Review. In
    Proceedings of the IEEE Nonrigid and Articulated Motion Workshop, pp.
    90-102. June 15-16, San Juan, Puerto Rico.

    Cedras, Claudette and Mubark Shah (1994). A Survey of Motion Analysis
    from Moving Light Displays. In CVPR94, pp. 214-221.

    Deutscher, Jonathan, Andrew Blake, and Ian Reid (2000). Articulated
    Body Motion Capture by Annealed Particle Filtering. In Proceedings

    Leventon, Michael E. and William T. Freeman (1998). Bayesian estimation
    of 3-d human motion from an image sequence. Technical Report 98-06,
    MERL - A Mitsubishi Electric Research Laboratory.


    Jason Harrison, PhD
    Post-Doctoral Fellow and Imager Lab Manager
    Imager Laboratory for Graphics, Visualization and HCI
    FSC3640 - 2424 Main Mall, Vancouver BC V6T 1Z4
    Cell: 604 644 8611 Lab: 604 822 2218; Fax: 604 822 8989

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