نتایج جستجو برای: Adaptive Thresholding

تعداد نتایج: 205559  

M. Alaee, M. Firoozmand, M. Sepahvand, R. Amiri,

In order to detect targets upon sea surface or near it, marine radars should be capable of distinguishing signals of target reflections from the sea clutter. Our proposed method in this paper relates to detection of dissimilar marine targets in an inhomogeneous environment with clutter and non-stationary noises, and is based on adaptive thresholding determination methods. The variance and t...

Journal: :iranian journal of medical physics 0
nima sahba master of science in biomedical engineering, research center for science and technology in medicine, islamic azad university, tehran, iran alireza ahmadian associate professor in biomedical engineering and physics, research center for science and technology in medicine, tehran university of medical sciences, tehran, iran nader riahi alam associate professor in biomedical engineering and physics, research center for science and technology in medicine, tehran university of medical sciences, tehran, iran masoumeh giti radiologist, imaging center, imam khomeini hospital, tehran university of medical sciences, tehran, iran

introduction:  breast  cancer  is  a  leading  cause  of  death  among  females  throughout  the  world.  currently,  radiologists are able to detect only 75% of breast cancer cases. making use of computer-aided design (cad)  can play an important role in helping radiologists perform more accurate diagnoses.   material and methods: using our hybrid method, the background and the pectoral muscle...

Journal: :journal of medical signals and sensors 0

electrocardiogram (ecg) is one of the most common biological signals which plays a significant role in diagnosis of heart diseases. one of the most important parts of ecg signal processing is interpretation of qrs complex and obtaining its characteristics. r wave is one of the most important sections of this complex which has an essential role in diagnosis of heart rhythm irregularities and als...

Journal: :IEEE Sensors Journal 2020

Journal: :journal of advances in computer research 2016
sedigheh ghofrani

ultrasound images suffer of multiplicative noise named speckle. different de-speckling algorithms run either in spatial domain or in transformed domain. in this paper, an adaptive filter in spatial domain according to assume the nakagami distribution as the statistic of log-compressed ultrasound images is used. for de-speckling in transformed domain, the non-sub sampled shearlet transform is us...

Journal: :رادار 0
محمودرضا صاحبی محمدجواد ولدان زوج فاطمه ذاکری

due to damaging effects of speckle noise to information of radar images, reduction of these effects has been considered by many researchers. we discussed speckle reduction of radar images based on curvelet transformation. more specifically we discussed the speckle reduction with emphasizing on preservation of the edges by hard thresholding of curvelet transformation. in this algorithm, first mu...

Journal: :Journal of Computational and Graphical Statistics 2009

Journal: :IEEE transactions on neural networks 2001
Xiao-Ping Zhang

In the paper, a type of thresholding neural network (TNN) is developed for adaptive noise reduction. New types of soft and hard thresholding functions are created to serve as the activation function of the TNN. Unlike the standard thresholding functions, the new thresholding functions are infinitely differentiable. By using the new thresholding functions, some gradient-based learning algorithms...

2016
M. Chandrakala

Thresholding is a simple but effective technique for image segmentation. In this paper, a general locally adaptive thresholding methods using neighborhood processing is presented. Local adaptive techniques are more effective in eliminating both uneven lighting disturbance, noise and ghost objects. In order to demonstrate the effectiveness, locally adaptive thresholding methods namely Niblack, S...

2013
Masoumeh Azghani Farokh Marvasti

In this paper, two methods are proposed which address the random sampling and compressed sensing recovery problems. The proposed random sampling recovery method is the Iterative Method with Adaptive Thresholding and Interpolation (IMATI). Simulation results indicate that the proposed method outperforms existing random sampling recovery methods such as Iterative Method with Adaptive Thresholding...

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