Adaptive High-Dynamic Range Three-Dimensional Shape Measurement Using DMD Camera

Abstract

The phase shifting profilometry for the object with high reflectivity variation is an important issue in equipment manufacturing, medical sciences, and entertainment industry. To address the problem, in this paper, an adaptive high dynamic range three-dimensional shape measurement using DMD camera is proposed. By analyzing the imaging characteristics affected by bidirectional reflectance distribution function and the crosstalk on CCD chip, the strategy that DMD modulation function is determined to avoid saturation prior to the acquisition of phase shifting images is applied. To verify the performance of the proposed method, the B/W flat checkerboard, the plastic button, and the metal slice with high-reflectivity variation are measured to reconstruct the 3D model. The experimental results show that our proposed method can correct the deformed phase which is caused by the image saturation. Finally, the measuring accuracy of the proposed method is given. Compared with two common high-dynamic range measurement methods, our proposed method has the advantages in the accuracy and the efficiency.

Keywords

• Shape measurement
• dynamic range
• optical saturation
• micromirrors