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A Novel Color Encoding Fringe Projection Profilometry based on Wavelet Ridge Technology and

Volume 14, Number 5, May 2018, pp. 917-926
DOI: 10.23940/ijpe.18.05.p10.917926

Yang Wanga,b, Yankee Sunb, Tianqi Zhangb, Deyun Chena, and Xiaoyang Yua

aPostdoctoral Station of Computer Science and Technology, Harbin University of Science and Technology, Harbin, 150080, China
bHigher Educational Key Laboratory for Measuring & Control Technology and Instrumentations of Heilongjiang Province, Harbin University of Science
and Technology, Harbin, 150080, China

(Submitted on February 16, 2018; Revised on March 21, 2018; Accepted on April 28, 2018)


There are two challenges in three-dimensional (3D) profilometry, such as real-time and accuracy. Color-encoding fringe projection profilometry (CEFPP) can
solve these challenges to some extent. It encodes in the red, green, and blue color channels, and CEFP can use three completely different fringe patterns. In
this paper, a novel CEFP that only uses one color fringe image acquired by experiential 3CCD cameras is presented. First, the wavelet transform
coefficients phase at the ridge position under the Morlet wavelet is theoretically clarified. A simple and quick method that acquires the scaling coefficient
is introduced. The wrapped phases in the three color channels of the color fringe image are obtained by wavelet bridge position. The phase original of color
fringe pattern is defined as one white color. Using an evolution function defined in this paper, the phase-crossing is located. An absolute phase is acquired
by a three coding pitch method in a two coding direction. In order to verify the presented method, some profilometry experiments are carried out in the
constructed 3D profilometry system using one projector and one 3CCD camera. The experimental results showed that a maximum standard deviation of
measurement error is 1.42mm, and the reconstruction surface of a gypsum head portrait can be determined.


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