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Related Experiment Video

Updated: May 20, 2026

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

Published on: December 3, 2013

Optimized pulse width modulation pattern strategy for three-dimensional profilometry with projector defocusing.

Chao Zuo¹, Qian Chen, Shijie Feng

¹Jiangsu Key Laboratory of Spectral Imaging & Intelligence Sense, Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210094, China. surpasszuo@163.com

|July 10, 2012

Summary

This summary is machine-generated.

This study introduces two new methods to improve 3D profilometry by generating accurate sinusoidal fringe patterns. These techniques minimize errors caused by projector nonlinearities, enhancing measurement precision for demanding applications.

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Area of Science:

Optics
Metrology
Computer Vision

Background:

Three-dimensional (3D) profilometry using sinusoidal fringe projection is vital for accurate surface measurement.
Nonlinear intensity response of video projectors introduces distortions, limiting measurement accuracy.
Existing methods like sinusoidal pulse width modulation (SPWM) reduce but do not eliminate these errors.

Purpose of the Study:

To develop novel techniques for generating highly accurate sinusoidal fringe patterns for 3D profilometry.
To mitigate residual errors caused by projector nonlinearities in phase-shifting algorithms.
To enhance the precision of 3D surface measurements, especially in high-accuracy fields.

Main Methods:

Optimizing sinusoidal pulse width modulation (SPWM) patterns based on specific criteria.
Integrating the optimized SPWM technique with a four-step phase-shifting algorithm.
Introducing a novel 'tripolar SPWM' method for generating ideal sinusoidal fringe patterns with minimal defocusing.

Main Results:

The proposed methods effectively eliminate dominant undesired harmonics, significantly improving phase accuracy.
Tripolar SPWM enables the generation of high-quality sinusoidal patterns with a reduced degree of projector defocusing.
Simulations and experimental results validate the superior performance of the developed techniques.

Conclusions:

The novel SPWM optimization and tripolar SPWM techniques offer significant advancements in 3D profilometry.
These methods address the limitations of existing techniques, enabling more precise and reliable surface measurements.
The findings contribute to the development of more accurate and robust optical metrology systems.