Calibration Of A Biostereometric System

A frequent problem in evaluating a technique for measurement of the human body is the lack of a standard of comparison. Even though determination of volume by water displacement, an unwieldy procedure for large objects, can yield accurate measurements, the difficulties of maintaining comparable volumes in the lungs during water immersion and photography of a living human call for a more stable calibration object. Regular objects may be used to test a system's capability under ideal conditions, and a calibration involving volume determination of a regular object of known dimensions was also carried out as described below. Yet the system must be evaluated in terms of its performance in measuring the human body form. Therefore, our laboratory tests were centered around the photogrammetric determination of the volume of a full size male mannequin, whose volume was also measured by immersion.