Optical EngineeringIntegration of view planning with nonuniform surface sampling techniques for three-dimensional object inspection
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Optimizing view planning achieves the goal of minimum occlusion and minimum rotation to insure complete inspection of an object, and not only satisfies the goal of view planning, but also automatically maximizes the number of surfaces to which adaptive sampling can most fully be applied. The best view based on visible edge length can usually not only minimize the number of rotations needed to inspect an entire object, but can also provide the maximum amount of information for integration with nonuniform sampling techniques for a variety of parts and manufacturing processes. This new integration approach of first viewing then sampling establishes that the optimization criterion of maximum edge length is more robust than anticipated in its original role for view planning alone. The best view based on the number of visible faces and the face area has proven applicable to integrating the finite element (FEM) centroid sampling and indirect adaptive sampling techniques, respectively, for the inspection of sculptured surface products. Experimental work has verified various theories proposed. The verified view planning criteria include both the edge length and the number of visible faces criterion. Of them, the number of visible faces criterion not only maximizes the number of visible meshes for centroid sampling, but also reveals the maximum amount of high curvature regions of an object.