Patent ID: 6931340

Claim:
An apparatus for calibrating a machine measuring system that has a first measuring device and a second measuring device, wherein the first measuring device and the second measuring device are image-capturing devices remote to a vehicle to undergo a measurement for capturing images of at least one target attached to the vehicle, the apparatus comprising: a first calibration device mounted in a known relationship to the first measuring device; second calibration device mounted in a known relationship to the second measuring device, wherein the first calibration device and the second calibration device coordinately generate measurements of a relative position between the first calibration device and the second calibration device; a memory device for storing a reference value that represents a reference position of the first calibration device relative to the second calibration device; and a data processor, coupled to the first measuring device, the second measuring device, and at least one of the first calibration device and the second calibration device, and configured to repeatedly receive signals representing the relative position between the first calibration device and the second calibration device, and determine vehicle parameters based on the images of the at least one target, the known relationship of the first measuring device relative to the first calibration device, the known relationship of the second measuring device relative to the second calibration device, and based on the relative position between the first calibration device and the second calibration device; wherein the data processor is further configured to periodically compare the reference value with a measurement coordinately generated by the first calibration device and the second calibration device representing an updated relative position between the first calibration device and the second calibration device.