Depth range enhancement of binary defocusing technique based on multi-frequency phase merging.

Binary defocusing technique has demonstrated various merits for high-speed and high-accuracy three-dimensional measurement. However, the existence of excessive defocusing zone (EDZ) limits the depth range of binary defocusing system. To overcome this problem, this paper proposes a multi-frequency phase merging (MFPM) approach, which makes it possible to measure the object surface in large depth range (LDR). The method is based on our finding that for different fringe frequencies, the associated EDZs of binary defocusing system are different and not totally overlapped. Thus by merging the phase maps of multiple binary fringes, we could effectively enhance the measurement depth range. Meanwhile, a strategy to determine the optimal combination of fringe frequencies is also proposed by analyzing the phase error distribution under different defocusing degrees. Both simulations and experiments verify the effectiveness and robustness of the proposed method.

[1]  Huijie Zhao,et al.  Defocusing parameter selection strategies based on PSF measurement for square-binary defocusing fringe projection profilometry. , 2018, Optics express.

[2]  Jorge L Flores,et al.  Three-dimensional shape profiling by out-of-focus projection of colored pulse width modulation fringe patterns. , 2017, Applied optics.

[3]  Yingchun Wu,et al.  Improved algorithm for phase-to-height mapping in phase measuring profilometry. , 2012, Applied optics.

[4]  Song Zhang,et al.  Superfast multifrequency phase-shifting technique with optimal pulse width modulation. , 2011, Optics express.

[5]  Dongliang Zheng,et al.  Phase error analysis and compensation for phase shifting profilometry with projector defocusing. , 2016, Applied optics.

[6]  Gastón A. Ayubi,et al.  Pulse-width modulation in defocused three-dimensional fringe projection. , 2010, Optics letters.

[7]  Xianyu Su,et al.  Automated phase-measuring profilometry using defocused projection of a Ronchi grating , 1992 .

[8]  X Su,et al.  Area modulation grating for sinusoidal structure illumination on phase-measuring profilometry. , 2001, Applied optics.

[9]  Song Zhang,et al.  Three-dimensional profilometry with nearly focused binary phase-shifting algorithms. , 2011, Optics letters.

[10]  Yajun Wang,et al.  Three-dimensional shape measurement with binary dithered patterns. , 2012, Applied optics.

[11]  Kosuke Sato,et al.  Dynamic defocus and occlusion compensation of projected imagery by model-based optimal projector selection in multi-projection environment , 2011, Virtual Reality.

[12]  Beiwen Li,et al.  Microscopic structured light 3D profilometry: Binary defocusing technique vs. sinusoidal fringe projection , 2017 .

[13]  Duk-Yong Choi,et al.  CMOS compatible fabrication of micro, nano convex silicon lens arrays by conformal chemical vapor deposition. , 2017, Optics express.

[14]  Song Zhang,et al.  High-speed 3D shape measurement with structured light methods: A review , 2018, Optics and Lasers in Engineering.

[15]  Anand Asundi,et al.  Phase error analysis and compensation for nonsinusoidal waveforms in phase-shifting digital fringe projection profilometry. , 2009, Optics letters.

[16]  Sikun Li,et al.  Optimal defocus selection based on normed Fourier transform for digital fringe pattern profilometry. , 2017, Applied optics.

[17]  Song Zhang,et al.  Ultrafast 3-D shape measurement with an off-the-shelf DLP projector. , 2010, Optics express.

[18]  Qican Zhang,et al.  Dynamic 3-D shape measurement method: A review , 2010 .

[19]  Xiubao Sui,et al.  Optimized pulse width modulation pattern strategy for three-dimensional profilometry with projector defocusing. , 2012, Applied optics.

[20]  Sai Siva Gorthi,et al.  Fringe projection techniques: Whither we are? , 2010 .

[21]  Song Zhang,et al.  3D shape measurement with 2D area modulated binary patterns , 2012 .

[22]  Song Zhang,et al.  Genetic method to optimize binary dithering technique for high-quality fringe generation. , 2013, Optics letters.

[23]  Subhasis Chaudhuri,et al.  On defocus, diffusion and depth estimation , 2007, Pattern Recognit. Lett..

[24]  Qian Chen,et al.  Robust and efficient multi-frequency temporal phase unwrapping: optimal fringe frequency and pattern sequence selection. , 2017, Optics express.

[25]  Song Zhang,et al.  Flexible 3-D shape measurement using projector defocusing. , 2009, Optics letters.