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Color fringe-projected technique for measuring dynamic objects based on bidimensional empirical mode decomposition

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Abstract

A triple-frequency color fringe-projected technique is presented to measure dynamic objects. Three fringe patterns with a carrier frequency ratio of 139 are encoded in red, green, and blue channels of a color fringe pattern and projected onto an object’s surface. Bidimensional empirical mode decomposition is used for decoupling the cross talk among color channels and for extracting the fundamental frequency components of the three fringe patterns. The unwrapped phase distribution of the high-frequency fringe is retrieved by a three-step phase unwrapping strategy to recover the object’s height distribution. Owing to its use of only a single snapshot, the technique is suitable for measuring dynamically changing objects with large discontinuity or spatially isolated surfaces.

©2012 Optical Society of America

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