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Optical Engineering

Grayscale imbalance correcting method based on fringe normalization in RGB tricolor real-time three-dimensional measurement
Author(s): Meixue Ma; Yiping Cao; Dawu He; Cheng Chen; Yingying Wan
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Paper Abstract

In real-time phase measuring profilometry based on color-encoded sinusoidal three-step phase-shifting algorithm, three frames of red (R), green (G), and blue (B) individual channel color-encoded sinusoidal gratings with an equivalent shifting phase of 2π/3 are combined to be a color fringe pattern. While this color fringe pattern is projected onto the measured object rapidly and sequentially by a special digital light projector, a high-speed monochrome camera synchronized with the projector signal is used to capture the corresponding deformed patterns in R, G, and B channels. Due to the monochrome camera’s different sensitivity to R, G, and B light, there will be a grayscale imbalance among the captured phase-shifting deformed patterns from R, G, and B channels. So, a grayscale imbalance correcting method based on fringe normalization is proposed. The experimental results verify the feasibility of the proposed method. The three-dimensional (3-D) shape information can be obtained in real-time. It is suitable for real-time 3-D measurement.

Paper Details

Date Published: 7 March 2016
PDF: 8 pages
Opt. Eng. 55(3) 034102 doi: 10.1117/1.OE.55.3.034102
Published in: Optical Engineering Volume 55, Issue 3
Show Author Affiliations
Meixue Ma, Sichuan Univ. (China)
Yiping Cao, Sichuan Univ. (China)
Dawu He, Sichuan Univ. (China)
Cheng Chen, Sichuan Univ. (China)
Yingying Wan, Sichuan Univ. (China)


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