2005
DOI: 10.1117/1.1886749
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Study of various preprocessing schemes and wavelet filters for speckle noise reduction in digital speckle pattern interferometric fringes

Abstract: A new filtering scheme is investigated for the removal of speckle noise in the recorded fringe pattern by a digital speckle pattern interferometric technique (DSPI). The scheme consists of a preprocessing scheme i.e., averaging, sampling, thresholding, and again averaging, followed either by a symlet or biorthogonal wavelet filter. The preprocessing scheme improves the contrast between the dark and bright fringes, and the implementation of the biorthogonal wavelet filter, which is symmetrical and purely linear… Show more

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Cited by 38 publications
(16 citation statements)
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“…For an image of size MxN pixels, it is defined in terms of the Discrete Fourier Transform (DFT) coefficients of the image in the frequency domain as follows: (8) where, F(j, k) denotes the DFT coefficient at position (j, k) [16]. Other traditionally used objective measures such as mean square error (MSE), peak signal-to-noise ratio (PSNR) and speckle index (SI) [15] are useful only in the context of noise reduction and filtering algorithms. For example, the SI value measures the level of residual speckle noise in an image, and is therefore not a useful measure in a synthetic image modelling application.…”
Section: The Evaluation Modelmentioning
confidence: 99%
“…For an image of size MxN pixels, it is defined in terms of the Discrete Fourier Transform (DFT) coefficients of the image in the frequency domain as follows: (8) where, F(j, k) denotes the DFT coefficient at position (j, k) [16]. Other traditionally used objective measures such as mean square error (MSE), peak signal-to-noise ratio (PSNR) and speckle index (SI) [15] are useful only in the context of noise reduction and filtering algorithms. For example, the SI value measures the level of residual speckle noise in an image, and is therefore not a useful measure in a synthetic image modelling application.…”
Section: The Evaluation Modelmentioning
confidence: 99%
“…Figure 5 shows the variations when the axial resolution m is increased in radial-polar sampling, keeping the lateral resolution fixed at n = 40. The interpolation used was Lanczos-3 [19]. As the number of sampling points along axial beams is increased, we observe that the sector image becomes smoother and less grainy.…”
Section: Synthetic Ultrasound Imagesmentioning
confidence: 95%
“…Commonly used interpolation methods are BSpline and cubic Hermite [16,17]. In [9], the authors used an interpolation scheme using the Lanczos-3 kernel [15,[18][19][20][21].…”
Section: Synthetic Ultrasound Imagesmentioning
confidence: 99%
“…Each sampling scheme has its own set of parametersthat can be varied over a wide range of values. The speckle noise generation algorithm also has a setLanczos-3 [18]. …”
Section: Synthetic Ultrasound Images 164mentioning
confidence: 99%