Fringe projection profilometry using a uniaxial MEMS micro-vibration mirror is becoming popular in three-dimensional (3D) reconstruction owing to the advantages of fast projection, small size, low cost, and no demand of focus optics. The calibration method is crucial and directly affects the accuracy of 3D reconstruction. In conventional phase-height calibration methods, there exists a problem of recalibration of system parameters if the maximum fringe frequency varies between the stages of calibration and reconstruction. In this paper, the fringe projection is realized by a MEMS mirror with a 1.15 kHz resonant frequency and a line laser. The voltage of line laser is modulated according to the scanning position, which is related to the vibration characteristics of MEMS mirror. Subsequently, the uniaxial MEMS-based 3D reconstruction system is constructed. We propose a novel calibration method for the uniaxial MEMS-based 3D reconstruction system. The proposed calibration method is derived from the scanning characteristics of a uniaxial vibration mirror and considers the camera distortion. The proposed method is free from the problem of recalibration and the limitations of installation. The experimental results show the proposed method can reconstruct the 3D shape of target in high resolution and verify the feasibility of the system.
Fringe projection profilometry using a uniaxial MEMS micro-vibration mirror is becoming popular in three-dimensional (3D) reconstruction owing to the advantages of fast projection, small size, low cost, and no demand of focus optics. The calibration method is crucial and directly affects the accuracy of 3D reconstruction. In conventional phase-height calibration methods, there exists a problem of recalibration of system parameters if the maximum fringe frequency varies between the stages of calibration and reconstruction. In this paper, the fringe projection is realized by a MEMS mirror with a 1.15 kHz resonant frequency and a line laser. The voltage of line laser is modulated according to the scanning position, which is related to the vibration characteristics of MEMS mirror. Subsequently, the uniaxial MEMS-based 3D reconstruction system is constructed. We propose a novel calibration method for the uniaxial MEMS-based 3D reconstruction system. The proposed calibration method is derived from the scanning characteristics of a uniaxial vibration mirror and considers the camera distortion. The proposed method is free from the problem of recalibration and the limitations of installation. The experimental results show the proposed method can reconstruct the 3D shape of target in high resolution and verify the feasibility of the system.
For specular reflection surface detection, high reflectivity is a large challenge to effectively extract the depth information of surface. Phase Measuring Deflectometry (PMD) based three-dimensional shape measurement is proposed for solving this problem. In this study, PMD method based on the characteristic of high specular reflectivity is used to perform structured light imaging on the glass surface to obtain depth information on the surface of the glass panel. In this paper, we propose a new image reconstruction method suitable for imaging specular reflection surface defects. According to the characteristic of the glass panel, the proposed method has a phase pre-unwrapping process and improves the least square method of unfolding and folding the phase algorithm. The experimental results show that the proposed method is more robust for imaging and detection of high-reflective plane than the traditional least squares method.
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