Phase error correction method for fringe projection profilometry systems while considering random noises and objects' reflectivity

Li Rao; Feipeng Da

doi:10.1117/12.2326933

24 July 2018 Phase error correction method for fringe projection profilometry systems while considering random noises and objects' reflectivity

Li Rao, Feipeng Da

Author Affiliations +

Proceedings Volume 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018); 1082702 (2018) https://doi.org/10.1117/12.2326933
Event: Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 2018, Shanghai, China

Abstract

Measuring objects with drastic texture variation is a big challenge for fringe projection profilometry (FPP) systems. In this paper, the reasons why textures on measured objects' surface influence the measurement accuracy are thoroughly analyzed and an effective phase error compensation method is proposed. Due to the existence of various random noises, the reconstruction accuracy will be negatively affected by the textures with different reflectivity. As an intrinsic feature of digital cameras, random noises be hardly removed by mathematical solutions. In this paper, it is mathematically proved that image pixels with the same fringe modulation have the same noise variance and the same phase error variance. With the aid of fringe orientations calculated in the phase map, pixels which satisfy the following two conditions are picked out as a group: 1. They should have the same phase. 2. They have almost the equivalent modulation values. Then the phase values of this group of pixels are averaged and this mean phase is the compensated phase value. Experiments demonstrate that the proposed method can effectively reduce phase errors caused by random noises and textures with small reflectivity.

Citation Download Citation

Li Rao and Feipeng Da "Phase error correction method for fringe projection profilometry systems while considering random noises and objects' reflectivity", Proc. SPIE 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 1082702 (24 July 2018); https://doi.org/10.1117/12.2326933

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KEYWORDS

Phase shift keying

Reflectivity

Error analysis

Modulation

Fringe analysis

Cameras

Digital cameras

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