Abstract

This study aims to demonstrate the performances of nonlocal means (NLM) and their variant denoising methods, mainly focusing on NLM-shaped adaptive patches and several NLM-reprojection schemes for speckle noise reduction in amplitude and phase images of the digital coherent imaging systems. In the digital coherent imaging systems such as digital speckle pattern interferometry, digital holographic interferometry, etc., the image quality is severely degraded by additive uncorrelated speckle noise, due to the coherent nature of the light source, and therefore limits the development of several applications of these imaging systems in many fields. NLM and its variant denoising methods are employed to denoise the intensity/phase images obtained from these imaging systems, and their effectiveness is evaluated by considering various parameters. The performance comparison of these methods with other existing speckle denoising methods is also presented. The performance of these methods for speckle noise reduction is quantified on the basis of two criteria matrices, namely, the peak-to-signal noise ratio and the image quality index. Based on these criteria matrices, it is observed that these denoising methods have the ability to improve the intensity and phase images favorably in comparison to other speckle denoising techniques, and these methods are more effective and feasible in speckle-noise reduction.

© 2019 Optical Society of America

Speckle noise reduction in digital speckle pattern interferometric fringes by nonlocal means and its related adaptive kernel-based methods

Yassine Tounsi, Manoj Kumar, Abdelkrim Nassim, and Fernando Mendoza-Santoyo
Appl. Opt. 57(27) 7681-7690 (2018)

Speckle denoising in digital holography by nonlocal means filtering

Amitai Uzan, Yair Rivenson, and Adrian Stern
Appl. Opt. 52(1) A195-A200 (2013)

Effective speckle noise suppression in optical coherence tomography images using nonlocal means denoising filter with double Gaussian anisotropic kernels

Jaehong Aum, Ji-hyun Kim, and Jichai Jeong
Appl. Opt. 54(13) D43-D50 (2015)

Nonlocal means image denoising using orthogonal moments

Ahlad Kumar
Appl. Opt. 54(27) 8156-8165 (2015)

Local denoising of digital speckle pattern interferometry fringes by multiplicative correlation and weighted smoothing splines

Alejandro Federico and Guillermo H. Kaufmann
Appl. Opt. 44(14) 2728-2735 (2005)