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Accuracy of Manual Digitizing

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  • Accuracy of Manual Digitizing

    Dear BIOMCH-L subscribers:

    I am developing a computer program to analyze manual digitized data of
    tennis serving from two synchronized cameras. I would like to check the
    accuracy of each trial of digitized data. I am considering using the segment
    length. For example, to determine the elbow angle, I would like to check the
    maximum, minimum and average length of the upper arm and the forearm over
    the whole time period of serving motion. I expect the average length is in
    the normal range in percentage of subject's height and the differences
    between the maximum/minimum and the average is small. In the program, I
    would like to reject those trials with greater body segment length
    variation. With good quality of video tapes and good digitizing, what kind
    of error (for example, the arm length change in percentage of the average
    length) should I expect? I would also like to know your experience on this
    issue. What percentage level of body segment length change you consider a
    good trial,