A method for phase unwrapping base digital spackle correlation

A new method for phase unwrapping is proposed, which makes the unwrapping of phase images realistic without binary codes or more frequency fringe images produced by projection systems, uses only one additional digital speckle pattern projected to help finding correspondence points. It means that the novel method is by the use of the additional speckle pattern to achieve a unique point correspondence. The proposed method to get unwrapped phase will save images recorded time. Experiment results demonstrated the proposed method is effective and robust.