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

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Dual-frequency pattern scheme for high-speed 3-D shape measurement.

Kai Liu¹, Yongchang Wang, Daniel L Lau

¹Department of Electrical Engineering, University of Kentucky, Lexington, KY 40507, USA.

|April 15, 2010

Summary

A new dual-frequency pattern improves 3D reconstruction by combining high and unit frequencies. This method enhances phase data quality and speed, overcoming limitations of traditional techniques for real-time applications.

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Area of Science:

Optics and Photonics
Computer Vision
Metrology

Background:

Phase unwrapping is crucial for 3D reconstruction but faces challenges like phase jumping and discontinuities.
Conventional spatial and temporal phase unwrapping methods have limitations in accuracy and speed.
Real-time 3D data processing requires efficient algorithms for phase generation and reconstruction.

Purpose of the Study:

To develop a novel dual-frequency pattern for robust phase information and reduced phase unwrapping ambiguities.
To overcome the shortcomings of conventional spatial phase unwrapping techniques.
To achieve higher quality phase data with fewer patterns compared to temporal methods.
To propose fast, look-up table based algorithms for real-time phase generation and 3D reconstruction.

Main Methods:

A novel dual-frequency pattern combining high-frequency and unit-frequency sinusoid components was developed.
The proposed pattern scheme addresses phase jumping and discontinuities in phase unwrapping.
Look-up table based algorithms were developed for fast phase generation and 3D reconstruction.
The algorithms were tested for real-time processing of a 640 x 480 video stream.

Main Results:

The proposed pattern scheme successfully overcomes phase jumping and discontinuities.
Higher quality phase data was achieved using fewer patterns compared to conventional temporal methods.
Phase data generation reached 1063.8 frames per second.
Full 3D coordinate point clouds were generated at 8.3 frames per second, significantly faster than previous studies.

Conclusions:

The novel dual-frequency pattern scheme offers a superior approach to phase unwrapping for 3D reconstruction.
The developed look-up table based algorithms enable high-speed, real-time 3D data processing.
This advancement provides a significant speed improvement for phase measuring profilometry applications.