Proceedings PaperAccuracy/repeatability test for a video photogrammetric measurement
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Industrial measurement applications include many tasks which are time critical. While faster measurement techniques are always desirable, there are also certain levels of accuracy and repeatability which must be maintained. Video-imaging technology has progressed to a point where acceptable accuracy levels for many applications should be attainable. This paper discusses experiences with measurement of a carefully calibrated targeted surface. Repeatability and accuracy are examined for a VIDEK MEGAPLUS camera using Imagraph image-processing hardware in a PC-BUS system. The target field is calibrated to nearly 1 part in 300,000 using the Geodetic Services, Inc. (GSI) STARS photogrammetric system. Computer simulations suggested potential accuracies of 1 part in 30,000 (with 1/20 pixel resolution) to 1 part in 80,000 (with 1/50th pixel resolution). Actual results on the order of 1 part in 60,000 were obtained. While speed is not central to the tests conducted, some expectations for speed are discussed. Measurements presented were completed in less than 1 hour per measurement cycle. Limitations and advantages of the tested hardware are noted with some thoughts on future implications.