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Regularized Speckle Reducing Anisotropic Diffusion for Feature Characterization

Yongjian Yu, Joseph Yadegar
2006 2006 International Conference on Image Processing  
Speckle reducing anisotropic diffusion (SAR) is a partial differential equation-based method developed for this purpose.  ...  For tissue characterization in medical ultrasound imagery or terrain characterization in synthetic aperture radar imagery, it is necessary to preprocess imagery to reduce granular, texture-alike noise  ...  Speckle reducing anisotropic diffusion (SRAD) [12] has been emerged as a tool for reducing speckle with regional feature neatly enhanced.  ... 
doi:10.1109/icip.2006.312609 dblp:conf/icip/YuY06 fatcat:vf64c5zs5zcndl3mzff2rf22a4

Condensed anisotropic diffusion for speckle reducton and enhancement in ultrasonography

Kalaivani Shanmugam, Wahidabanu RSD
2012 EURASIP Journal on Image and Video Processing  
The regularization enables the correction of feature broadening distortion which is the common problem in second-order diffusion-based methods.  ...  This article proposes a technique for speckle reduction in medical ultrasound (US) imaging which preserves the point and linear features with the added advantage of energy condensation regulator.  ...  Jayakumar from Sarani clinic, Pudansandhai, Tamilnadu for their support and thoughtful comments.  ... 
doi:10.1186/1687-5281-2012-12 fatcat:bxvgsknjuvbebamtd4fyk56zom

Scatterer Density In Edge And Coherence Enhancing Nonlinear Anisotropic Diffusion For Medical Ultrasound Speckle Reduction

Ahmed Badawi, J. Michael Johnson, Mohamed Mahfouz
2007 Zenodo  
This paper proposes new enhancement models to the methods of nonlinear anisotropic diffusion to greatly reduce speckle and preserve image features in medical ultrasound images.  ...  SDWNAD superior performances over nonlinear coherent diffusion (NCD), speckle reducing anisotropic diffusion (SRAD), adaptive weighted median filter (AWMF), wavelet shrinkage (WS), and wavelet shrinkage  ...  Rushdi, PhD student at University of Miami, Computer Science Department for his assistance in the startup of Matlab implementation of the isotropic work. Dr.  ... 
doi:10.5281/zenodo.1072775 fatcat:ysdvq6mmlbcxpavn64l47opn5a

Nonlinear multiscale wavelet diffusion for speckle suppression and edge enhancement in ultrasound images

Yong Yue, M.M. Croitoru, A. Bidani, J.B. Zwischenberger, J.W. Clark
2006 IEEE Transactions on Medical Imaging  
This paper introduces a novel nonlinear multiscale wavelet diffusion method for ultrasound speckle suppression and edge enhancement.  ...  Relying on this feature, both the envelope-detected speckle image and the log-compressed ultrasonic image can be directly processed by the algorithm without need for additional preprocessing.  ...  ACKNOWLEDGMENT The authors would like to thank all of the anonymous reviewers for their suggestions.  ... 
doi:10.1109/tmi.2005.862737 pmid:16524086 fatcat:g62jniqlnjdspixwjyq32vqnyi

Weighted Non-Linear Diffusion Filtering with Wavelet Thresholding in Image Denoising

Reena Singh, V. K. Srivastava
2013 International Journal of Computer Applications  
In the second phase of the proposed algorithm, anisotropic diffusion is applied on approximate coefficients.  ...  The diffusivity function derived is applied depending on local image features and hence improve the capability of feature preservation along with noise removal.  ...  T more effectively characterizes the local features of the image. Figure shows the local gray level variance over a 7×7 window.  ... 
doi:10.5120/13588-1318 fatcat:w3oq6qn7ozdcbj5wri6yjrdz7y

Optical Coherence Tomography (OCT) in Ophthalmology: Introduction

James G. Fujimoto, Wolfgang Drexler, Joel S. Schuman, Christoph K. Hitzenberger
2009 Optics Express  
However, due to factors such as speckle noise, low image contrast, irregularly shaped morphological features such as retinal detachments, macular holes, and drusen, accurate segmentation of individual  ...  shaped structural features in the OCT images.  ...  Shakheel for assistance with the retinal images acquisition and data processing.  ... 
doi:10.1364/oe.17.003978 pmid:19259239 pmcid:PMC5542846 fatcat:xys4a3ic7vfnfjga7vcijjwune

Novelty Detection‐Based Internal Fingerprint Segmentation in Optical Coherence Tomography Images [chapter]

Rethabile Khutlang, Pheeha Machaka, Ann Singh, Fulufhelo Nelwamondo
2017 Computed Tomography - Advanced Applications  
Using a mixture of Gaussian's novelty detection routine on images pre-processed with a regularized anisotropic diffusion filter, the papillary contours-internal fingerprints-are consistent with those segmented  ...  Speckle noise is first reduced using non-linear filters from the slices composing the 3-D image. Subsequently, the stratum corneum is used to extract the epidermis.  ...  First, the slices are filtered by a regularized anisotropic diffusion filter to reduce the effects of speckle noise.  ... 
doi:10.5772/67594 fatcat:gzxfvf2itrcujbxg2be3rqmvzq

Intra-retinal layer segmentation in optical coherence tomography images

Akshaya Mishra, Alexander Wong, Kostadinka Bizheva, David A. Clausi
2009 Optics Express  
However, due to factors such as speckle noise, low image contrast, irregularly shaped morphological features such as retinal detachments, macular holes, and drusen, accurate segmentation of individual  ...  shaped structural features in the OCT images.  ...  Shakheel for assistance with the retinal images acquisition and data processing.  ... 
doi:10.1364/oe.17.023719 pmid:20052083 fatcat:mksups7j6ba6jkxpxdmbrcwtc4

Phase asymmetry guided adaptive fractional-order total variation and diffusion for feature-preserving ultrasound despeckling [article]

Kunqiang Mei, Bin Hu, Baowei Fei, Binjie Qin
2018 arXiv   pre-print
It is essential for ultrasound despeckling to remove speckle noise while simultaneously preserving edge features for accurate diagnosis and analysis in many applications.  ...  The experimental results show that our method outperforms other state-of-the-art ultrasound despeckling filters in both speckle reduction and feature preservation.  ...  The authors would like to thank all the cited authors for providing the source codes used in this work and the anonymous reviewers for their valuable comments on this paper.  ... 
arXiv:1810.12538v1 fatcat:yisc3dbllfgivcj47y3puzwtja

MODIFIED NLM MODEL FOR DESPECKLING ULTRASOUND IMAGES USING FCM CLUSTERING BASED PRE CLASSIFICATION AND RIBM

K.M. Prabusankarlal, P. Thirumoorthy, R. Manavalan, R. Sivaranjani
2018 ICTACT Journal on Image and Video Processing  
Speckle noise is an inherent characteristic of ultrasound which reduces the classification accuracy of computer aided diagnosis (CAD) systems.  ...  A modified non local means (NLM) filter for despeckling ultrasound images is proposed in this article.  ...  Geertsma, MD, Head, Department of Radiology, Gelderse Vallei Hospital, Ede, Netherlands, for providing breast ultrasound images in various categories.  ... 
doi:10.21917/ijivp.2018.0240 fatcat:3xhzp47yh5cr7dzgj5gciagpfm

Scatterer Density In Nonlinear Diffusion For Speckle Reduction In Ultrasound Imaging: The Isotropic Case

Ahmed Badawi
2008 Zenodo  
Different diffusion parameters were tested and tuned to best reduce speckle noise and preserve edges.  ...  This paper proposes a method for speckle reduction in medical ultrasound imaging while preserving the edges with the added advantages of adaptive noise filtering and speed.  ...  Yu and Acton [34] have proposed a filtering scheme based on filters first described by Lee and Frost, called speckle reducing anisotropic diffusion (SRAD).  ... 
doi:10.5281/zenodo.1329512 fatcat:hotuos7dkbgnbmprvoidgnnnry

Anisotropic Diffusion Filter With Memory Based on Speckle Statistics for Ultrasound Images

Gabriel Ramos-Llorden, Gonzalo Vegas-Sanchez-Ferrero, Marcos Martin-Fernandez, Carlos Alberola-Lopez, Santiago Aja-Fernandez
2015 IEEE Transactions on Image Processing  
Most of the state-of-the-art filters try to reduce the speckle effect without considering its relevance for the characterization of tissue nature.  ...  However, the speckle phenomenon is the inherent response of echo signals in tissues and can provide important features for clinical purposes.  ...  Diffusion Filters for Speckle A entirely different paradigm about speckle filtering started with the application of anisotropic diffusion techniques in this field by Yu and Acton [27] .  ... 
doi:10.1109/tip.2014.2371244 pmid:25415987 fatcat:5bupztqyjbac5dta4wiibueipy

Subjective and objective evaluations of feature selected multi output filter for speckle reduction on ultrasound images

M Outtas, L Zhang, O Deforges, A Serir, W Hamidouche, Y Chen
2018 Physics in Medicine and Biology  
Three radiologists with different years of experience, have subjectively evaluated the speckle reduction methods according to enhanced features.  ...  The results of objective metrics and subjective evaluation showed that the proposed method reduces speckle and could help radiologists, according to their years of experience, in the diagnostic task.  ...  , by introducing Speckle Reducing Anisotropic Diffusion filter (SRAD), applied anisotropic diffusion filter for the first time to speckle noise.  ... 
doi:10.1088/1361-6560/aadbc9 pmid:30129565 fatcat:hmi7eh4ypvgghgtrm7jzxh3qwm

Anderson Localization of Ultracold Atoms: Where is the Mobility Edge?

Michael Pasek, Giuliano Orso, Dominique Delande
2017 Physical Review Letters  
The non-trivial effect of anisotropy in the spatial correlations of experimental speckle potentials have been put forward as a possible cause for such discrepancy.  ...  experiments on non-interacting ultra-cold atoms in correlated disorder have yielded conflicting results regarding the so-called mobility edge, i.e. the energy threshold separating Anderson localized from diffusive  ...  Pilati for sending us the raw data of Ref. 25  ... 
doi:10.1103/physrevlett.118.170403 pmid:28498715 fatcat:cnztz5qw7rgv3jlwdzrzurzyiq

A Novel Method for Despeckling of Ultrasound Images Using Cellular Automata-Based Despeckling Filter

Ankur Bhardwaj, Sanmukh Kaur, Anand Prakash Shukla, Manoj Kumar Shukla
2021 International Journal of E-Health and Medical Communications (IJEHMC)  
In different approaches for reducing the speckle noise, there exists a class of filters that convert multiplicative noise into additive noise by using algorithmic functions.  ...  Ultrasound images have an inherent property termed as speckle noise that is the outcome of interference between incident and reflected ultrasound waves which reduce image resolution and contrast and could  ...  SRAD filter The Speckle Anisotropic Diffusion Filter performs de-speckling and maintains image edges without changing its valuable information.  ... 
doi:10.4018/ijehmc.20210901.oa2 fatcat:c4khvnugjved3ktvhou62lrqd4
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