Computer Vision Techniques for Comparing Laser Doppler Velocimeter Scans of a Vibrating Plate to Analytical Plate Modesby David E. Montgomery, Virginia Polytechnic Inst and State, Univ, Blacksburg, United States,
Robert L. West, Virginia Polytechnic Inst and State, Univ, Blacksburg, United States,
Abstract: Computer vision procedures were applied to velocity images of a vibrating square steel plate. A scanning laser Doppler velocimeter (LDV) measured the images of low frequency resonant operating modes of the plate. The images were then compared to a set of analytical plate mode descriptions to identify the best match. The primary imaging functions were Sobel and median filtering, image differencing, region growing, and shape templet matching. Experimental results indicate that shape template matching was most successful in mode identification. Applications of computer vision techniques to large scale structures and further characterizations of structural dynamics using the LDV are discussed.
Subject Headings: Imaging techniques | Vibration | Lasers | Doppler systems | Computing in civil engineering | Steel plates | Signal processing
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