Large depth-of-field three-dimensional shape measurement with focal sweep technique

, , Song Zhang, Yujin Zhang &
Three-dimensional (3D) shape measurement based on fringe projection technique has been extensively used for scientific discoveries and industrial practices. Yet, one of the most challenging issues is its limited depth of field (DOF). This paper presents a method to drastically increase DOF of 3D shape measurement technique by employing the focal sweep method. The proposed method employs an electrically tunable lens (ETL) to rapidly sweep focal planes during image integration, and the post deconvolution algorithm...
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