A phase-angle inspired calibration strategy based on MEMS projector for 3D reconstruction with markedly reduced calibration images and parameters

Abstract

3D reconstruction system based on MEMS (micro-electro-mechanical system) mirror has an advantage of small-size and low-cost. However, those existing calibration methods for such systems generally require many calibration images and parameters, which is time-consuming. To address this issue, we propose a phase-angle inspired calibration strategy with reduced calibration images and parameters. This method selects samples of isophase planes by sampling and coordinate transformation, and establishes an isophase planes model that will have deflection angle changes with phase changes, considering possible misalignment deviations. During reconstruction, it determines the equations of the current isophase plane and the back-projection rays to complete the geometric constraints. The experiments verified that the proposed method achieved planeness error of <0.06 mm and sphere error of <0.05 mm with only two calibration positions.