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Updated: Feb 20, 2026
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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
Published on: December 3, 2013
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Three-dimensional shape profiling by out-of-focus projection of colored pulse width modulation fringe patterns.
Applied Optics
|October 20, 2017
Summary
This study introduces color-based binary fringe patterns to improve 3D shape profiling accuracy. The new method reduces projector non-linearity issues, enhancing the precision of the defocusing technique for better surface measurements.
Area of Science:
- Optics and Photonics
- Metrology
- Computer Vision
Background:
- Sinusoidal phase-shifting methods for 3D shape profiling are hindered by projector non-linearity.
- The defocusing technique offers an alternative for generating sinusoidal fringe patterns but relies on precise binary patterns and defocusing levels.
Purpose of the Study:
- To enhance the accuracy of 3D shape profiling using the defocusing technique.
- To mitigate the impact of projector non-linearity on fringe pattern generation.
Main Methods:
- Implementation of color-based binary fringe patterns using colored pulse width modulation (PWM).
- Generation of fringe patterns with varying carrier signal frequencies.
- Utilizing numerical simulations and experimental validation.
Main Results:
- Colored PWM fringe patterns exhibit lower amplitude harmonics compared to conventional PWM patterns.
- Reduced defocusing requirements leading to improved 3D shape profiling accuracy.
- Successful validation through simulations and experiments.
Conclusions:
- Color-based binary fringe patterns offer a significant improvement for 3D shape profiling.
- The proposed technique effectively reduces projector non-linearity effects.
- This method enhances the precision and reliability of optical metrology systems.
