3-D shape measurement based on dithering technique

  • Zhao Xincheng University College London, London, WC1E 6BT
  • Zhang Yi Jiangsu University of Science and Technology, Zhenjiang, 212003
  • Yan Xin Jiangsu University of Science and Technology, Zhenjiang,
Keywords: measurement, dithering algorithm, fringe projection, defocusing technique, fringe analysis

Abstract

Projector defocusing technique can eliminate projector nonlinearity in real-time three-dimensional shape measurement. However, the high-frequency harmonics brought by defocusing technique weakens the sinusoidal feature of the defocused fringe patterns, which will bring obvious measurement errors. The dithering algorithm is proposed to generate binary fringe, the projector is defocused properly to achieve approximate sinusoidal fringes. This method improves the sinusoidal property of the defocused fringe patterns. Absolute phase is retrieved by applying this method and phase-shifting algorithm. Simulations and experiments are carried out to verify the proposed method, and results show that phase quality has been improved greatly. Compared with existing methods, the proposed method achieves higher precision and can generate fringe patterns more sinusoidal, which is more proper for projector defocusing technique.

Author Biographies

Zhao Xincheng, University College London, London, WC1E 6BT

Department of Information Studies

University College London, London, WC1E 6BT

Zhang Yi, Jiangsu University of Science and Technology, Zhenjiang, 212003

School of Electrical and Information

Jiangsu University of Science and Technology

Yan Xin, Jiangsu University of Science and Technology, Zhenjiang,

School of Electrical and Information

Published
2016-11-30