| Summary: | 碩士 === 國立臺北科技大學 === 自動化科技研究所 === 106 === Fringe Projection Profilometry using sinusoidal fringes is one of the most popular techniques employed in 3D surface measurement. After obtaining wrapped phase map by fringe analysis methods, phase map needs to be unwrapped to get continuous unwrapped phase map. In this article, a hybrid phase unwrapping strategy was developed to enhance the accuracy of the unwrapped algorithm by combining spatial and temporal phase unwrapping method. The spatial phase unwrapping method is robust for unwrapping at continuous surfaces. However, it cannot correctly unwrap for discontinue surfaces. On another hand, the temporal unwrapping method can scan at arbitrary shape surfaces. However, the temporal unwrapping method is very delicate to noise. The proposed method exploits the advantages of these two methods to obtain a more robust unwrapped phase algorithm. Experimental results preliminarily demonstrate the validity and applicability of this proposed method. In comparison with conventional temporal unwrapping method, the proposed method can achieve more robust unwrapped phase map, especially in low signal-to-noise areas.
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