Combined stereovision and phase shifting method: use of a visibility-modulated fringe pattern

Xu Han; Peisen Huang

doi:10.1117/12.828227

17 June 2009 Combined stereovision and phase shifting method: use of a visibility-modulated fringe pattern

Xu Han, Peisen Huang

Proceedings Volume 7389, Optical Measurement Systems for Industrial Inspection VI; 73893H (2009) https://doi.org/10.1117/12.828227
Event: SPIE Europe Optical Metrology, 2009, Munich, Germany

Abstract

We propose to use a visibility-modulated fringe pattern to enable real-time image acquisition in the newly proposed combined stereovision and phase shifting method for 3-D shape measurement. The combined stereovision and phase shifting method uses two cameras and one projector and can eliminate errors caused by inaccurate phase measurement, such as periodic errors due to the nonlinearity of the projector's gamma curve. In order to achieve pixel-to-pixel matching between the two cameras, we previously used two phase-shifted fringe patterns, one with fringes in the vertical direction and the other in the horizontal direction. This means that the projected fringe pattern has to be switched during the image acquisition process, which slows down the process. As a result, measurement of dynamically changing objects is difficult. In this paper, we propose to use a visibility-modulated fringe pattern to eliminate the need of the second fringe pattern. This new fringe pattern is sinusoidal in the horizontal direction as in a conventional fringe pattern, but is visibility-modulated in the vertical direction. With this new pattern, we can obtain the phase information in one direction and fringe visibility information in the other direction simultaneously for stereo matching. Since no pattern changing is necessary during the image acquisition process, the image acquisition time can be reduced to less than half of the time previously required, thus making the measurement of dynamically changing objects possible. Experimental results are presented to demonstrate the effectiveness of the proposed method.

Citation Download Citation

Xu Han and Peisen Huang "Combined stereovision and phase shifting method: use of a visibility-modulated fringe pattern", Proc. SPIE 7389, Optical Measurement Systems for Industrial Inspection VI, 73893H (17 June 2009); https://doi.org/10.1117/12.828227

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