نتایج جستجو برای: edge artifact

تعداد نتایج: 131069  

Journal: :Anesthesiology 2006
Gyu-Jeong Noh Kye-Min Kim Yong-Bo Jeong Seong-Wook Jeong Hee-Suk Yoon Sung-Moon Jeong Sung-Hong Kang Olinto Linares Steven E Kern

BACKGROUND The aim of this study was to investigate the independent effect of remifentanil on the approximate entropy (ApEn) in frontoparietal montages. The authors investigated which montages were relevant to assess the remifentanil effect on the electroencephalogram. Spectral edge frequency and the canonical univariate parameter were used as comparators. METHODS Twenty-eight healthy volunte...

Journal: :journal of medical signals and sensors 0

medical image registration methods which use mutual information as similarity measure have been improved in recent decades. mutual information is a basic concept of information theory which indicates the dependency of two random variables (or two images). in order to evaluate the mutual information of two images their joint probability distribution is required. several interpolation methods, su...

Journal: :Journal of Intelligent and Fuzzy Systems 2018
Kamilla Aliakhmet Diana Sadykova Joshin John Mathew Alex Pappachen James

Image blurring artifact is the main challenge to any spatial, denoising filters. This artifact is contributed by the heterogeneous intensities within the given neighborhood or window of fixed size. Selection of most similar intensities (G-Neighbors) helps to adapt the window shape which is of edge-aware nature and subsequently reduce this blurring artifact. The paper presents a memristive circu...

Journal: :journal of advances in computer research 2014
mohammad shahbakhti elnaz heydari mohsen naji

removal of artifacts from bio-signals is a necessary step before automatic processing and obtaining clinical information. recently, many applications of empirical mode decomposition (emd) on biomedical researches have been presented that artifact reduction from bio-signals is one of them. emd separates a time series into finite numbers of its individual oscillations, which are called intrinsic ...

Journal: :Magnetic resonance in medicine 2016
Elias Kellner Bibek Dhital Marco Reisert

PURPOSE To develop a fast and stable method for correcting the gibbs-ringing artifact. METHODS Gibbs-ringing is a well-known artifact which manifests itself as spurious oscillations in the vicinity of sharp image gradients at tissue boundaries. The origin can be seen in the truncation of k-space during MRI data-acquisition. Correction techniques like Gegenbauer reconstruction or extrapolation...

2014
Qi Zhang Xiaoyong Shen Li Xu Jiaya Jia

Images contain many levels of important structures and edges. Compared to masses of research to make filters edge preserving, finding scale-aware local operations was seldom addressed in a practical way, albeit similarly vital in image processing and computer vision. We propose a new framework to filter images with the complete control of detail smoothing under a scale measure. It is based on a...

Journal: :Journal of Neurology, Neurosurgery & Psychiatry 2003

2016
Nidhi Sen Akhilesh Jain Swapnil Jain Zhengguo Li Jinghong Zheng Zijian Zhu Wei Yao Shiqian Wu B. Y. Zhang J. P. Allebach A. K. Moorthy A. C. Bovik J. Pang O. C. Au Pierre Charbonnier Laure Blanc-F ́eraud Gilles Aubert Michel Barlaud Z. G. Li J. H. Zheng

It is well-known that local filtering-based edge preserving smoothing method suffers from halo artifacts. In this paper, a weighted guided image filter is introduced by incorporating an edge-aware weighting into an accessible guided image filter to address the problem. The WGIF inherit benefits of both global and local smoothing filters in the sense that: 1) the difficulty of the WGIF is O(N) f...

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