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http://dx.doi.org/10.6109/jkiice.2016.20.10.1973

An Efficient 3D Measurement Method that Improves the Fringe Projection Profilometry  

Kim, Ho-Joong (Department of Computer Engineering, KOREATECH)
Cho, Tai-Hoon (School of Computer Science and Engineering, KOREATECH)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.20, no.10, 2016 , pp. 1973-1979 More about this Journal
Abstract
As technologies evolve, diverse 3D measurement techniques using cameras and pattern projectors have been developed continuously. In 3D measurement, high accuracy, fast speed, and easy implementation are very important factors. Recently, 3D measurement using multi-frequency fringe patterns for absolute phase computation has been widely used in the fringe projection profilometry. This paper proposes an improved method to compute the object's absolute phase using the reference plane's absolute phase and phase difference between the object and the reference plane. This method finds the object's absolute phase by adding the difference between the reference plane's wrapped phase and the object's wrapped phase to the reference plane's absolute phase already obtained in the calibration stage. Through this method, there is no need to obtain multi-frequency fringe patterns about new object for the absolute phase computation. Instead, we only need the object's phase difference relative to the reference planes's phase in the measurement stage.
Keywords
Absolute phase; Fringe projection; Fast speed; High accuracy; 3D measurement;
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