Trapezoidal phase-shifting method for three-dimensional shape measurement

Peisen S. Huang; Song Zhang; Fu-Pen Chiang

doi:10.1117/1.2147311

1 December 2005 Trapezoidal phase-shifting method for three-dimensional shape measurement

Peisen S. Huang, Song Zhang, Fu-Pen Chiang

Author Affiliations +

Optical Engineering, Vol. 44, Issue 12, 123601 (December 2005). https://doi.org/10.1117/1.2147311

Abstract

We propose a novel structured light method, namely a trapezoidal phase-shifting method, for 3-D shape measurement. This method uses three patterns coded with phase-shifted, trapezoidal-shaped gray levels. The 3-D information of the object is extracted by direct calculation of an intensity ratio. Compared to traditional intensity-ratio-based methods, the vertical or depth resolution is six times better. Also, this new method is significantly less sensitive to the defocusing effect of the captured images, which makes large-depth 3-D shape measurement possible. If compared to sinusoidal phase-shifting methods, the resolution is similar, but the data processing speed is at least 4.5 times faster. The feasibility of this method is demonstrated in a previously developed real-time 3-D shape measurement system. The reconstructed 3-D results show similar quality to those obtained by the sinusoidal phase-shifting method. However, since the data processing speed is much faster (4.6 ms per frame), both image acquisition and 3-D reconstruction can be done in real time at a frame rate of 40 fps and a resolution of 532×500 points. This real-time capability allows us to measure dynamically changing objects, such as human faces. The potential applications of this new method include industrial inspection, reverse engineering, robotic vision, computer graphics, medical diagnosis, etc.

©(2005) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Peisen S. Huang, Song Zhang, and Fu-Pen Chiang "Trapezoidal phase-shifting method for three-dimensional shape measurement," Optical Engineering 44(12), 123601 (1 December 2005). https://doi.org/10.1117/1.2147311

Published: 1 December 2005

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available