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

Lu, Feng; Wu, Chengdong

doi:10.1186/s41476-017-0055-7

Cited by 7 publications

(4 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[4] In addition, measurement error is introduced, if a commercial projector is utilized without calibrating its nonlinear gamma. [5] The binary defocusing techniques have been developed to break the speed bottleneck. [1,6,7] Moreover, nonlinear gamma can be eliminated automatically with 1-bit depth patterns.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multi-objective strategy to optimize dithering technique for high-quality three-dimensional shape measurement*

Cai¹,

Chen²,

Cao

et al. 2019

Chinese Phys. B

View full text Add to dashboard Cite

Dithering optimization techniques can be divided into the phase-optimized technique and the intensity-optimized technique. The problem with the former is the poor sensitivity to various defocusing amounts, and the problem with the latter is that it cannot enhance phase quality directly nor efficiently. In this paper, we present a multi-objective optimization framework for three-dimensional (3D) measurement by utilizing binary defocusing technique. Moreover, a binary patch optimization technique is used to solve the time-consuming issue of genetic algorithm. It is demonstrated that the presented technique consistently obtains significant phase performance improvement under various defocusing amounts.

show abstract

Section: Introductionmentioning

confidence: 99%

“…, 114, 120 were used to ensure the practicability. Various defocusing amounts were simulated by using the Gaussian filters with different sizes S and standard σ , (S =[5,9,13], σ = S/3).…”

mentioning

confidence: 99%

Multi-objective strategy to optimize dithering technique for high-quality three-dimensional shape measurement*

Cai¹,

Chen²,

Cao

et al. 2019

Chinese Phys. B

View full text Add to dashboard Cite

show abstract

“…Based on the structure of digital micromirror device (DMD), we are able to present the binary patterns by simply toggling DMD, which can improve the frame rate. [8] Moreover, the 1-bit depth of a binary pattern can eliminate the projector nonlinearity error easily. However, the measurement quality based on the binary defocusing technique is not comparable to that from the conventional DFP technique due to the harmonic errors.…”

Section: Introductionmentioning

confidence: 99%

Optimized dithering technique in frequency domain for high-quality three-dimensional depth data acquisition*

Cai¹,

Chen²,

Cao³

et al. 2019

Chinese Phys. B

View full text Add to dashboard Cite

On the basis of the objective functions, dithering optimization techniques can be divided into the intensity-based optimization technique and the phase-based optimization technique. However, both types of techniques are spatial-domain optimization techniques, while their measurement performances are essentially determined by the harmonic components in the frequency domain. In this paper, a novel genetic optimization technique in the frequency domain is proposed for high-quality fringe generation. In addition, to handle the time-consuming difficulty of genetic algorithm (GA), we first optimize a binary patch, then join the optimal binary patches together according to periodicity and symmetry so as to generate a full-size pattern. It is verified that the proposed technique can significantly enhance the measured performance and ensure the robustness to various amounts of defocusing.

show abstract

“…Moreover, gamma calibration is required but this process will increase the computation complexity [17]. The phase error compensation is also required to remove the phase error of reconstruction results [18]. But there is not a standard method which can be used in different applications.…”

Section: Introductionmentioning

confidence: 99%

High-speed 3D shape measurement using Fourier transform and stereo vision

Yang

2018

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

Self Cite

View full text Add to dashboard Cite

Background: In the fast 3D shape measurement, it is an important factor to use the least number of fringe patterns to get the wrapped phase and the wrapped phase is always required to be retrieved to absolute phase. But the process of phase unwrapping may affect the quality of absolute phase. Besides absolute phase retrieval is time-costing especially for high-speed 3D shape measurement. Methods: This paper proposes a fast measurement method based on Fourier transform profilometry and stereo vision. Because of the property of stereo vision, every point can find its corresponding point in the wrapped phase. This method can reconstruct 3D surface without phase unwrapping. In order to further increase the measurement speed and overcome the gamma effect of projector, the dithering fringe pattern is used. To resist false matching, the original image matching constraint gives a rough parallax. Phase matching and sub-pixel parallax optimization are used to reduce the matching errors. In order to confirm the phase value of points which are at the edge of wrapped phase, average phase value is calculated. Results: A white mask is measured based on the proposed method. The results from every step show the effect of different functions. To better show the effect of the proposed method, a white house is measured and the measurement is compared with LSSM and MFH. In order to further to show the advantage of the proposed method, discontinuous blocks and continuous blocks are measured. The average height, RMS, average error, maximum error are compared with the method which uses absolute phase to match the corresponding points. Experiment results verify the feasibility of the proposed method and it can measure complex objects with high speed and accuracy. Conclusion: This paper uses Fourier transform and stereo vision to get wrapped phase and reconstruct 3D shape without phase unwrapping. The proposed method contains three part: phase matching, edge points detection and sub-pixel parallax optimization. By comparing matching precision, the proposed method can get high quality surface. Because the process of measurement only need one frame of deformed fringe pattern to get the wrapped phase and the matching process does not need phase unwrapping, the proposed method has the potential to be used in fast measurement.

show abstract

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

Cited by 7 publications

References 18 publications

Multi-objective strategy to optimize dithering technique for high-quality three-dimensional shape measurement*

Multi-objective strategy to optimize dithering technique for high-quality three-dimensional shape measurement*

Optimized dithering technique in frequency domain for high-quality three-dimensional depth data acquisition*

High-speed 3D shape measurement using Fourier transform and stereo vision

Contact Info

Product

Resources

About