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Real-time profilometry by bicolor grating video projection.

Yujiao Zhang1, Yiping Cao1, Haitao Wu1

  • 1College of Electronics and Information Engineering, Sichuan University, Chengdu, China.

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|November 29, 2021
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Summary

This study introduces a new real-time 3D measurement method using bicolor grating projection. It enhances speed and accuracy for moving objects by simplifying grating patterns and improving color calibration.

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Area of Science:

  • Optics and Photonics
  • Computer Vision
  • Metrology

Background:

  • Traditional 3D measurement methods face challenges with speed and accuracy, especially for dynamic scenes.
  • Chromatic aberration and crosstalk in color imaging systems can degrade measurement precision.

Purpose of the Study:

  • To develop a novel real-time 2+1 three-dimensional (3D) measuring method using bicolor grating video projection.
  • To improve the acquisition speed and real-time accuracy of 3D measurements for moving objects.

Main Methods:

  • A novel real-time 2+1 3D measurement technique utilizing bicolor grating video projection.
  • Encoding two frames of bicolor gratings with phase-shifted sinusoidal fringes (red channel) and background light (blue channel).
  • Projecting a synthesized repetitive bicolor grating video and capturing the deformed pattern with a color CMOS camera for 2+1 algorithm processing.

Main Results:

  • The proposed method effectively eliminates chromaticity imbalance and reduces color crosstalk through pre-measurement calibration.
  • Experimental results validate the feasibility and effectiveness of the real-time 3D measurement technique.
  • Achieved improved 3D measurement acquisition speed and real-time accuracy compared to traditional 2+1 methods.

Conclusions:

  • The novel bicolor grating projection method offers a significant advancement in real-time 3D measurement.
  • The technique is particularly effective for dynamic scenes and moving objects.
  • This method provides a robust solution for high-speed, accurate 3D surface reconstruction.