Journal
OPTICS AND LASERS IN ENGINEERING
Volume 50, Issue 10, Pages 1484-1493Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2011.11.021
Keywords
Shiny surface; Specular surface; 3-D measurement; Phase-shifting; High dynamic range
Categories
Funding
- National High Technology Research and Development Program of China (863 Program) [2008AA042403]
- Program for Changjiang Scholars and Innovative Research Team in University [0705]
- Fundamental Research Funds for the Central Universities
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This paper presents a novel 3-D scanning technique for high-reflective surfaces based on phase-shifting fringe projection method. High dynamic range fringe acquisition (HDRFA) technique is developed to process the fringe images reflected from the shiny surfaces, and generates a synthetic fringe image by fusing the raw fringe patterns, acquired with different camera exposure time and the illumination fringe intensity from the projector. Fringe image fusion algorithm is introduced to avoid saturation and under-illumination phenomenon by choosing the pixels in the raw fringes with the highest fringe modulation intensity. A method of auto-selection of HDRFA parameters is developed and largely increases the measurement automation. The synthetic fringes have higher signal-to-noise ratio (SNR) under ambient light by optimizing HDRFA parameters. Experimental results show that the proposed technique can successfully measure objects with high-reflective surfaces and is insensitive to ambient light. (C) 2012 Elsevier Ltd. All rights reserved.
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