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Design review of a unique camera-aided positioning system

This paper reviews a patented technique for measuring (or monitoring) XYZ coordinate positions. Unlike theodolites, which depend on a well-established instrument position for measurement accuracy, this system relies on mechanical accuracies that are easily built into custom targets. The targets consist of several elements organized to create coordinate systems within the camera field of view. These systems are related to one another by software to produce the desired measurements. Target elements may be active (LED's, integrating diffuse sources) or passive (retro-reflective circles). Position changes as small as 0.002 inches at distances over 20 feet are repeatably detected. In principle the stand off distance can be increased to over 100 feet. Several applications are discussed in addition to system specifications.