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Theory of Operation
To determine Relative Camera Position we need to take the xture of a length we know and place it across
the runways, placing one target in the left camera’s vision and one target in the right camera’s vision.
The right camera measures the distance to the right target, the left camera measures the distance to the left
target, and the memory has the xture length. We have 3 of the 4 sides of a trapezoid, and through applica-
tion of mathematics we can determine the fourth – RCP. We also recheck our calculations several times by
placing the xture back on the runways at different points before proceeding.
The RCP procedure establishes the missing dimension that allows side-to-side determination – each cam-
era’s position with respect to each other. The accuracy of this calculation is highly dependent on the xture
being dimensionally stable as we move it from point to point on the rack. The nal step is to recheck the
xture to make sure it is the same length. We call this rechecking the xture length.
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