Improved performance of multi-view fringe projection 3D microscopy.

Fringe projection 3D microcopy (FP-3DM) plays an increasingly important role in micro manufacturing and measurement. In recent decades, research on FP-3DM has made considerable progress. Nevertheless, some disadvantages arising from the limited depth of field, local specular reflection and occlusion still exist and need to be further addressed. In this paper, a multi-view FP-3DM (MVFP-3DM) is presented. Four imaging branches with the Scheimpflug condition and one vertical projection branch are deployed to establish the system. The system is described with a general imaging model, which is independent of the system configuration. In system calibration, the edge of binary fringe is used to locate the benchmark, which takes advantage of the fact that the edge will keep its position whether it is in focus or out of focus. Furthermore, a group of experiments prove that our proposed MVFP-3DM system can extend measurable range in depth, improve precision in 3D reconstruction and reduce occlusion.