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Related Experiment Video

Updated: Oct 17, 2025

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A super-grayscale and real-time computer-generated Moiré profilometry using video grating projection.

Hongmei Li1,2, Yiping Cao3, Yingying Wan1

  • 1Department of Optical Electronics, Sichuan University, Chengdu, 610064, China.

Scientific Reports
|October 7, 2021
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Summary

A novel super-grayscale, real-time Moiré profilometry technique uses video grating projection to capture detailed 766-grayscale patterns. This method enhances accuracy and expands the linear range in computer-generated Moiré profilometry.

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Area of Science:

  • Optical Metrology
  • Computer Vision
  • Image Processing

Background:

  • Traditional digital static gratings are limited to 256-grayscale.
  • Existing computer-generated Moiré profilometry methods face digital error limitations.
  • Real-time, high-resolution 3D surface measurement remains a challenge.

Purpose of the Study:

  • To propose a super-grayscale, real-time computer-generated Moiré profilometry method.
  • To overcome the grayscale limitations of traditional static gratings.
  • To reduce digital error and expand the linear range in Moiré profilometry.

Main Methods:

  • Utilizing time-division multiplexing of a projector and integral exposure of a charge-coupled device (CCD) camera.
  • Designing a super-grayscale grating (766-grayscale) divided into three 256-grayscale fringe patterns.
  • Synthesizing these patterns into a video grating for projection and capturing with a 10-bit CCD camera.

Main Results:

  • Successfully captured super-grayscale deformed patterns with a maximum of 766-grayscale.
  • Effectively reduced digital error in computer-generated Moiré profilometry.
  • Expanded the linear range of the deformed pattern by 20%.

Conclusions:

  • The proposed video grating projection method enables high-accuracy and real-time Moiré profilometry.
  • The technique effectively addresses limitations of traditional static gratings.
  • Experimental validation confirms the method's capability for advanced 3D surface measurement.