Period correction method for binary fringe defocused projection

Fu, Yanjun; Wang, Zhigang; Yang, Jie; Jiang, Guangyu

doi:10.1016/j.ijleo.2014.08.069

Cited by 8 publications

(6 citation statements)

References 24 publications

(28 reference statements)

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“…A prominent advantage of the proposed TSBE method differing from existing spatial encoding methods [7][8][9][11][12][13][14][15][16][17][18][19] (binary defocusing techniques) is that in measurement the projector and camera are both focused instead of defocused, allowing a large measurement range such as in standard sinusoidal fringes. 1,2,4 For this purpose, a Gaussian window of 5 pixels × 5 pixels, standard derivation of 5/3 pixels is adopted to emulate the low-pass filter function of the experimental PMP system.…”

Section: Discussionmentioning

confidence: 99%

“…[7][8][9][11][12][13][14][15][16][17][18][19] As for the temporal encoding, when implementing encoding for a given pixel f k M ði; jÞ inside intensity interval k (spatial encoding), the same pixels of other intensity intervals will be encoded according to our following specially designed rules (the details are described subsequently). The encoding-produced quantization error E k ði; jÞ ¼ f k M ði; jÞ − B k ði; jÞ is the difference between the modified image f k M ði; jÞ including the previously processed pixels and the quantized results B k ði; jÞ.…”

Section: Temporal-spatial Binary Encoding Methodsmentioning

confidence: 99%

“…[7][8][9][10][11][12][13][14][15][16] Early in 1992, Su et al 10 proposed a square binary defocusing technique for 3-D shape measurement, but its performance in accuracy is unavoidably degraded by high-frequency components. [7][8][9][10][11][12][13][14][15][16] Early in 1992, Su et al 10 proposed a square binary defocusing technique for 3-D shape measurement, but its performance in accuracy is unavoidably degraded by high-frequency components.…”

Section: Introductionmentioning

confidence: 99%

“…Distinct from spatial encoding methods in which encoding is implemented only in an unique pattern, [7][8][9][11][12][13][14][15][16][17][18][19] the proposed method encodes a sinusoidal fringe pattern to generate more than two binary fringe patterns simultaneously in the temporal and spatial domains in conjunction with the most extensively adopted 2-D error diffusion in printing. Distinct from spatial encoding methods in which encoding is implemented only in an unique pattern, [7][8][9][11][12][13][14][15][16][17][18][19] the proposed method encodes a sinusoidal fringe pattern to generate more than two binary fringe patterns simultaneously in the temporal and spatial domains in conjunction with the most extensively adopted 2-D error diffusion in printing.…”

Section: Introductionmentioning

confidence: 99%

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Temporal-spatial encoding binary fringes toward three-dimensional shape measurement without projector nonlinearity

Zhu

Zhou

et al. 2015

Opt. Eng

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Projector nonlinearity is a common problem for digital structured light-based three-dimensional (3-D) shape measurement techniques. A temporal-spatial binary encoding method is presented for the purpose of eluding it. We build a 3-D shape measurement scheme by combining our proposed method with phase measurement profiling. A standard sinusoidal fringe pattern is divided into more than two binary fringe patterns using specially designed temporal and spatial binary encoding rule based on intensity hierarchic quantification, and then are in-focus projected onto the measured object at a time sequence to reconstruct a frame phase-shifting fringe image. On account of the projected binary fringe pattern strictly consisting of zeros and ones, the influence of the projector nonlinearity on the measurement result can be effectively ruled out and simultaneously enables high-quality sinusoidality. In-depth investigations by theoretical analysis and experiments are conducted to demonstrate the performance of this method.

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Section: Discussionmentioning

confidence: 99%

Section: Temporal-spatial Binary Encoding Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temporal-spatial encoding binary fringes toward three-dimensional shape measurement without projector nonlinearity

Zhu

Zhou

et al. 2015

Opt. Eng

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“…Besides the accuracy of the narrow stripes and wide stripes are compared. In order to reduce the errors caused by wide stripes, Fu Y, et al [14] propose a non-uniform periodical binary fringe defocusing projection. Xian and Su [15] develop the area modulation grating technique.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional measurement of object surface by using ellipse binary defocusing projection

2017

J. Eur. Opt. Soc.-Rapid Publ.

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Background: The accuracy of three-dimensional measurement of object surface is always affected by the nonlinear gamma of the projector. The defocusing binary projection can overcome the nonlinear gamma distortion of the projector and reduce the effect of high harmonics without gamma calibration. Although researches have already reduced the errors to get a clear sinusoidal curve, there still leave room for improvement, especially when wide stripes are applied during the measurement. Methods: This paper presents a kind of ellipse binary pattern. By analyzing the property and spectrum, the binary pattern can produce high quality sinusoidal curve and produce smaller errors. It has a better effect to use an ellipse pattern to overcome the nonlinear gamma distortion of the projector and it is suit to be used as wide stripes. Results: Simulation and comparison experiments plus three-step phase shifted method are conducted to verify feasibility and accuracy of this binary pattern. The experimental results have indicated that this binary pattern can increase the accuracy of 3D measurement and reduce phase errors caused by the nonlinear gamma of the projector. The defocusing ellipse pattern is superior to traditional methods. In addition, the defocusing binary stripe is robust and suit to measure object with large period.

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CloudSec: A Lightweight and Agile Approach to Secure Medical Image Transmission in the Cloud Computing Environment

Mondal,

Chatterjee

2024

SN COMPUT. SCI.

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Period correction method for binary fringe defocused projection

Cited by 8 publications

References 24 publications

Temporal-spatial encoding binary fringes toward three-dimensional shape measurement without projector nonlinearity

Temporal-spatial encoding binary fringes toward three-dimensional shape measurement without projector nonlinearity

Three-dimensional measurement of object surface by using ellipse binary defocusing projection

CloudSec: A Lightweight and Agile Approach to Secure Medical Image Transmission in the Cloud Computing Environment

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