Abstract
A dynamic phase measuring profilometry (PMP) based on tricolor binary fringe combined time-division multiplexing principle is proposed. Only one tricolor binary fringe combined by red (R), green (G), and blue (B) binary fringes with the same fringe width but without any color overlapping one another is needed and sent into the flash memory of a high-speed digital light projector (HDLP) in advance. A specialized time-division multiplexing timing sequence is designed to control the HDLP to project the tricolor binary fringe saved in the flash memory onto the measured dynamic object separately and sequentially at 234 fps, at the same time, the projected light source mode is set as monochrome mode which means that all the RGB LEDs remain lighting. Meanwhile, it also triggers a high frame rate monochrome camera synchronized with the HDLP to capture the corresponding deformed patterns in R, G and B channels. By filtering, the nearly unbroken phase-shifting sinusoidal deformed patterns for three-step PMP can be extracted from the captured deformed patterns. It is equivalent to the three-dimensional (3D) shape reconstruction of the measured dynamic object at 78 fps. Experimental results verify the feasibility and the validity of the proposed method. It is effective for measuring the dynamic object and can avoid the color cross-talk effectively.
Highlights
Optical three dimensional (3D) shape measurement based on fringe projection is widely used in many fields such as industry inspection [1], 3D thermal deformation measurement of electronic devices [2], 3D point cloud reconstruction [3], 3D printing [4], face recognition [5] and so on with its advantages of noncontacting measurement, full-field acquisition, high precision, and ease of information processing
In order to avoid the color cross-talk problem completely, the multiple fringes phase measuring profilometry (PMP) based on high-speed projection system [23] is proposed to realize dynamic 3D shape measurement
Due to the binary feature of the encoded binary fringe, the projection fringe refresh rate of the high-speed digital light projector (HDLP) can be improved greatly, so the proposed method can be used to reconstruct the 3D shapes of the real-time changing or dynamic object
Summary
Optical three dimensional (3D) shape measurement based on fringe projection is widely used in many fields such as industry inspection [1], 3D thermal deformation measurement of electronic devices [2], 3D point cloud reconstruction [3], 3D printing [4], face recognition [5] and so on with its advantages of noncontacting measurement, full-field acquisition, high precision, and ease of information processing. Cao et al proposed an improved RGB tricolor based fast phase measuring profilometry in which the chroma transfer function (CTF) was introduced to correct the color cross-talk and grayscale imbalance problems among R, G, and B channels [22] This method can reduce the effect of these problems and improve the measuring accuracy, but it may be hard to avoid these problems completely and needs additional calibration experiments. In order to avoid the color cross-talk problem completely, the multiple fringes PMP based on high-speed projection system [23] is proposed to realize dynamic 3D shape measurement This method mainly utilized the high-speed digital light projector (HDLP) to project the N frames of phase-shifting sinusoidal fringes onto the measured object at N times of dynamic frame rate. [30,31]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
