Accurate shape and deformation measurement by spatiotemporal phase-shifting method using high dimensional intensity information

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A novel phase analysis technique for three-dimensional shape and deformation measurement was proposed, namely, the spatiotemporal phase-shifting method(ST-PSM), which determines phase information of fringe pattern by using high dimensional intensity information in the spatial and temporal domain simultaneously. Simulation and experimental results showed that the phase error caused by random noise of the camera and vibration of the measurement system can be dramatically decreased by the proposed method. As the result, three-dimensional shape and deformation measurement can be performed with the order of micrometer accuracy.