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DLT -- addendum

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  • DLT -- addendum

    Dear Biomch-L readers,

    As a supplement to Ton van den Bogert's postings on the DLT, I might mention
    once again the existence of two Biomch-L files which can be retrieved by
    the membership with the following commands to ListServ@hearn.bitnet or to
    ListServ@nic.surfnet.nl (*not* to the Biomch-L address, though, which is for
    posting messages only):

    SEND DLTDSP README BIOMCH-L
    SEND DLTDSP FORTRAN BIOMCH-L

    with arbitrary contents of the Subject: line. BITNET users may retrieve
    these files also interactively. Note that the second file is for "members
    only", so it should be retrieved from your subscription address, and not
    from some other (work)station!

    One problem I had when trying out the DLT for the first time is that the
    projection of the camera's position vector in the global coordinate system
    (w.r.t. which the calibration points are expressed) onto its optical axis
    should not vanish: the "1" in the DLT's denominator is the result of dividing
    out this term. It took me two days to find out that one should not set the
    camera position vector to zero when running the DLT on simulated data ....
    Practically, one usually chooses the global origin somewhere in the field of
    view, in which case this problem is avoided.

    Regards -- hjw.
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