Contrast enhancement of electronic speckle pattern interferometry addition fringes

Ochoa, Noé Alcalá; Santoyo, Fernando Mendoza; Moore, Andrew J.; López, Carlos Pérez

doi:10.1364/ao.36.002783

Cited by 21 publications

(7 citation statements)

References 3 publications

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“…Figure 1a is a simple computer-simulated original circular speckle fringe pattern with image size of 2566256 pixels in 256 grey levels, which is a typical closed fringe pattern and generated by means of the method reported in Ref. 16 …”

Section: Experiments and Discussionmentioning

confidence: 99%

Denoising in digital speckle pattern interferometry using fast discrete curvelet transform

Wang

2013

The Imaging Science Journal

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In digital speckle pattern interferometry, the denoising of speckle fringe patterns is of vital importance for quantitative extraction of phase distribution. A filtering method of fast discrete curvelet transform based on weighted average thresholding technique is proposed in this paper for noise removal in speckle fringe patterns. Both computer-simulated and experimental digital speckle pattern interferometry fringe patterns are adopted to evaluate the performance of the proposed filtering method. In addition, a widely used and representative filtering method, windowed Fourier filter, is introduced for making a comparison and validation in the image processing effect, and the parameter of peak signal noise ratio is also used for assessment of denoising effect. It is shown from the filtered results that the filtering method of fast discrete curvelet transform is effecitve to remove speckle noises and simultaneously preserve fringe structure information.

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Section: Experiments and Discussionmentioning

confidence: 99%

Denoising in digital speckle pattern interferometry using fast discrete curvelet transform

Wang

2013

The Imaging Science Journal

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“…In a pulsed ESPI system, the intensity of the ESPI interferogram after deformation is expressed as [28] …”

Section: Parameter Estimation From Optical Fringe Patterns With a Quamentioning

confidence: 99%

“…At the matched rotation angle corresponding to each row (or column), the peak value corresponding to each row (or column) was obtained, then the maximum of the peak values was found, and finally the optimal matched rotation angle α x (or α y ) was obtained and the coefficient k x (or k y ) was determined by using Eqs. (28) and (29), with a relative error of approximately 0.38% (or 0.23%). A column-by-column FRFT was performed on the fringe to obtain the phase derivative map, as depicted in Fig.…”

Section: Analysis Of the Simulated Espi Fringe Patternsmentioning

confidence: 99%

Parameter estimation of optical fringes with quadratic phase using the fractional Fourier transform

Zhang

Tao

et al. 2015

Optics and Lasers in Engineering

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a b s t r a c tOptical fringes with a quadratic phase are often encountered in optical metrology. Parameter estimation of such fringes plays an important role in interferometric measurements. A novel method is proposed for accurate and direct parameter estimation using the fractional Fourier transform (FRFT), even in the presence of noise and obstacles. We take Newton's rings fringe patterns and electronic speckle pattern interferometry (ESPI) interferograms as classic examples of optical fringes that have a quadratic phase and present simulation and experimental results demonstrating the performance of the proposed method.

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“…The concept behind the standard deviation method differs from that of local-standarddeviation methods. 13 The standard deviation method is applicable to sequential images in the temporal domain, and removes noise from both the background and disturbance; the local-standard-deviation method focuses on a local region of a specific image, calculating the standard deviation value around the point (x, y) to enhance the contrast of the resulting image. Following Eq.…”

Section: Standard Deviation In the Temporal Domainmentioning

confidence: 99%

Measurement of resonant mode of piezoelectric thin plate using speckle interferometry and frequency-sweeping function

Chang

2012

Review of Scientific Instruments

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This study proposes a frequency-sweeping function of electronic speckle pattern interferometry, based on standard deviation in the temporal domain. The proposed method facilities the measurement of resonant vibration, and provides stable and clear interference fringes. This study investigated the third in-plane eigenmode of a thin piezoelectric plate, using the finite element method and an impedance analyzer to verify the dynamic response obtained using the proposed method. We analyzed the vibration amplitude of interference fringes to obtain quantitative results on the sub-micron scale. The close agreement between the experimental results demonstrates the effectiveness of using the frequency-sweeping function to obtain the resonant states and provides an accurate prediction of resonance. Furthermore, statistical analysis of interference fringes obtained using the subtractive, mean, and the standard deviation method is performed. The result shows that the standard deviation method provides higher quality and stability of fringe pattern.

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Contrast enhancement of electronic speckle pattern interferometry addition fringes

Cited by 21 publications

References 3 publications

Denoising in digital speckle pattern interferometry using fast discrete curvelet transform

Denoising in digital speckle pattern interferometry using fast discrete curvelet transform

Parameter estimation of optical fringes with quadratic phase using the fractional Fourier transform

Measurement of resonant mode of piezoelectric thin plate using speckle interferometry and frequency-sweeping function

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