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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
Published on: December 3, 2013
Two-step phase-shifting fringe projection profilometry: intensity derivative approach.
1Key Laboratory of MEMS of Education Ministry, Southeast University, Nanjing 210096, China. yang-fj@seu.edu.cn
Applied Optics
|October 13, 2007
Summary
A novel two-step phase-shifting fringe projection profilometry method accelerates 3D profile measurement. This technique effectively removes background intensity variations for high-resolution, subpixel-accurate results.
Area of Science:
- Optical Metrology
- 3D Imaging
Background:
- Fringe projection profilometry is a key technique for 3D shape measurement.
- Traditional methods often require multiple steps, increasing measurement time.
- Variable background intensity can degrade measurement accuracy.
Purpose of the Study:
- To introduce a new, faster two-step phase-shifting fringe projection profilometry method.
- To enhance accuracy by effectively removing background intensity variations.
- To validate the proposed method through simulation and experimentation.
Main Methods:
- A two-step phase-shifting algorithm is employed.
- An intensity differential algorithm removes slowly variable background intensity.
- Global interpolation on a subpixel scale achieves high-resolution differential measurement.
Main Results:
- The proposed method significantly speeds up profile measurement compared to three- or four-step methods.
- High-resolution differential measurements are achieved.
- Computer simulations and experimental results confirm the method's validity.
Conclusions:
- The developed two-step phase-shifting method offers a faster and accurate approach for 3D profile measurement.
- This technique effectively addresses challenges posed by variable background intensity.
- The method shows promise for applications requiring rapid, high-precision 3D imaging.
