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13 November 2014 Novel high speed method using gray level vector modulation for 3D shape measurement
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Binocular Vision Technique is widely used in three-dimensional(3-D)measurement. Matching of pictures captured from two cameras is the most critical and difficult step in 3-D shape reconstruction. The method combines codedstructured light and spatial phase is usually adopted. However, being time consuming in matching, this method could not meet the requirements of real-time 3-D vision. In order to satisfy the high speed characteristic of real-time measurement, a novel method using gray level vector modulation is introduced. Combining binary code with gray coding principle, new coding patterns using gray level vector method is designed and projected onto the object surface. Each pixel corresponds to the designed sequence of gray values as a feature vector. The unique gray level vector is then dimensionally reduced to a resulting value which could be used as characteristic information for binocular matching. Experimental results further demonstrated the correctness and feasibility of the proposed method with fewer component patterns and less computational time.
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Gui-Wen Lin, Dong Li, and Jin-Dong Tian "Novel high speed method using gray level vector modulation for 3D shape measurement", Proc. SPIE 9276, Optical Metrology and Inspection for Industrial Applications III, 92761X (13 November 2014);

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