In this paper, a temporal shift unwrapping technique is presented for solving the problem of shift wrapping associated with spatial shift estimation (SSE)-based fringe pattern profilometry (FPP). Based on this technique, a novel 3D shape measurement method is proposed, where triangular patterns of two different spatial frequencies are projected. The patterns of the higher frequency are used to implement the FPP, and the one with lower frequency is utilized to achieve shift unwrapping. The proposed method is able to solve the shift unwrapping problem associated with the existing multi-step triangular pattern FPP by projection of an additional fringe pattern. The effectiveness of the proposed method is verified by experimental results, where the same accuracy as existing multi-step triangular pattern FPP can be achieved, but enabling the measurement of objects with complex surface shape and high steps. Disciplines Engineering | Science and Technology Studies Abstract:In this paper, a temporal shift unwrapping technique is presented for solving the problem of shift wrapping associated with spatial shift estimation (SSE)-based fringe pattern profilometry (FPP). Based on this technique, a novel 3D shape measurement method is proposed, where triangular patterns of two different spatial frequencies are projected. The patterns of the higher frequency are used to implement the FPP, and the one with lower frequency is utilized to achieve shift unwrapping. The proposed method is able to solve the shift unwrapping problem associated with the existing multi-step triangular pattern FPP by projection of an additional fringe pattern. The effectiveness of the proposed method is verified by experimental results, where the same accuracy as existing multi-step triangular pattern FPP can be achieved, but enabling the measurement of objects with complex surface shape and high steps. 21739-21747 (2011). 6. X. Su, L. Su, W. Li, and L. Xiang, "New 3D profilometry based on modulation measurement," Proc. SPIE 3853, 1-7 (1998). 7. S. Toyooka and M. Tominga, "Spatial fringe scanning for optical phase measurement," Opt. Commun. 51(2), 68-70 (1984). 8. S. Toyooka and Y. Iwaasa, "Automatic profilometry of 3-D diffuse objects by spatial phase detection," Appl.Opt. 25(10), 1630-1633 (1986). 9. R. Rodríguez-Vera and M. Servin, "Phase locked loop profilometry," Opt. Laser Technol. 26(6), 393-398 (1994). 10. D. M. Meadows, W. O. Johnson, and J. B. Allen, "Generation of surface contours by moiré patterns," Appl. Opt. 9(4), 942-947 (1970). 11. A. Asundi and Z. Wensen, "Unified calibration technique and its applications in optical triangular profilometry," Appl. Opt. 38(16), 3556-3561 (1999). 12. P. Huang, Q. Ho, F. Jin, and F. Chiang, "Colour-enhanced digital fringe projection technique for high-speed 3-D surface contouring," Opt. Eng. 38(6), 1065-1071 (1999). 13. Z. Zhang, C. E. Towers, and D. P. Towers, "Robust color and shape measurement of full color artifacts by RGB fringe projection," Opt. Eng. 51(2), 021109 (2012). 14. J. Guo, X. Pen...
. (2009). A fringe period unwrapping technique for digital fringe profilometry based on spatial shift estimation. In P. Huang, T. Toshizawa & K. Harding (Eds.), Optical Inspection and Metrology for Non-Optics Industries, Proceeding of SPIE: . Washington, USA: SPIE.A fringe period unwrapping technique for digital fringe profilometry based on spatial shift estimation AbstractIn this paper we present a review of the phase unwrapping problem in Fringe Pattern Profilometry (FPP), based on which we study the spatial shift wrapping problem in spatial shift estimation (SEE) based FPP. An approach for carrying out the spatial shift unwrapping is proposed with its performance confirmed by experiments. Disciplines Physical Sciences and Mathematics Publication DetailsCao, P., Xi, J., Chicharo, J. ABSTRACTIn this paper we present a review of the phase unwrapping problem in Fringe Pattern Profilometry (FPP), based on which we study the spatial shift wrapping problem in spatial shift estimation (SEE) based FPP. An approach for carrying out the spatial shift unwrapping is proposed with its performance confirmed by experiments.Keywords: fringe pattern profilometry, 3D measurement, phase unwrapping Introduction:In recent years, fringe pattern profilometry (FPP) has attracted increasing research effort as an enabling technology for non-contact measurement of three-dimensional (3D) object surfaces. Among various system implementation schemes for FPP, the one based on digital video projection (DVP) is particularly attractive due to the advantages of simple system structure and controllable fringe patterns. Figure 1 shows the system structure of a DVP based FPP, consisting of a digital video projector, a CCD camera and a reference plane. With the system, a frame of image with a particular fringe pattern is produced by the digital projector and projected onto the reference plane, and then onto the surface of the object when the reference plane is removed. The projected images from the reference plane and the object surface are captured by the CCD camera, with the later being a deformed version of the former by the variance of the height of the object surface. As the deformed fringe pattern carries the information of surface shape, 3D profile of the object can be retrieved from these two fringe patterns.
In this paper, a new approach is presented for solving the problem of spatial shift wrapping associated with Spatial Shift Estimation (SSE)-based Fringe Pattern Profilometry (FPP). The problem arises as the result of fringe reuse (that is, fringes periodic light intensity variance), and the spatial shift can only be identified without ambiguity with the range of a fringe width. It is demonstrated that the problem is similar to the phase unwrapping problem associated with the phase detection based FPP, and the proposed method is inspired by the existing ideas of using multiple images with different wavelengths proposed for phase unwrapping. The effectiveness of the proposed method is verified by experimental results on an object with complex surface shape. 2014 SPIE.
An approach is presented to solve the problem of spatial shift wrapping associated with spatial shift estimation-based fringe pattern profilometry (FPP). This problem arises as the result of fringe reuses (that is, use of fringes with periodic light intensity variance), and the spatial shift can only be identified without ambiguity within the range of a fringe width. It is demonstrated that the problem is similar to the phase unwrapping problem associated with the phase-detection-based FPP, and the proposed method is inspired by the existing ideas of using multiple images with different wavelengths proposed for phase unwrapping. The effectiveness of the proposed method is verified by comparing experimental results against several objects, with the last object consisting of more complex surface features. We conclude by showing that our method is successful in reconstructing the fine details of the more complex object. Abstract. An approach is presented to solve the problem of spatial shift wrapping associated with spatial shift estimation-based fringe pattern profilometry (FPP). This problem arises as the result of fringe reuses (that is, use of fringes with periodic light intensity variance), and the spatial shift can only be identified without ambiguity within the range of a fringe width. It is demonstrated that the problem is similar to the phase unwrapping problem associated with the phase-detection-based FPP, and the proposed method is inspired by the existing ideas of using multiple images with different wavelengths proposed for phase unwrapping. The effectiveness of the proposed method is verified by comparing experimental results against several objects, with the last object consisting of more complex surface features. We conclude by showing that our method is successful in reconstructing the fine details of the more complex object.
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