نتایج جستجو برای: gradient vector flow gvf field

تعداد نتایج: 1491606  

2017
Zafer Guler Ahmet Cinar

Structures that can detect the shapes in images in a flexible manner are widely used today. Active contour model, which is one of these structures, is an important model. This model aims to surround the shape with points and to enable these points to fit into the shape. However, since Active Contour Model contains energy minimization, it requires long working time. Scaling based model developed...

2015
Ruomei Wang Jinping Feng Zhong Wang Qiuyuan Luo

In this paper an approach to extract the Left Ventricle (LV) endocardium contour by proposing an improved Distribution Matching (DM) algorithm is presented, the main idea of which is to match the distribution of grayscale and distance constrained by gradient vector flow (GVF) force field between the sample and the images input. The endocardium contour is then regarded as the initial iterative c...

2007
Ramesh Marikhu Matthew N. Dailey Stanislav S. Makhanov Kiyoshi Honda

The geographic information system industry would benefit from flexible automated systems capable of extracting linear structures from satellite imagery. Quadratic snakes allow global interactions between points along a contour, and are well suited to segmentation of linear structures such as roads. However, a single quadratic snake is unable to extract disconnected road networks and enclosed re...

Journal: :Journal of Research and Practice in Information Technology 2014
Shin-Jin Kang SooKyun Kim

Producing crowd simulations is a time-consuming task. The amount of technical work required for control ling relevant crowd parameters is a hurdle for effective production. In this paper we propose a new authoring method that can easily create crowd simulations with intuitive painting interface. For this, Self Organized Distribution Map (SODM), Stroke-based Flow Field and Gradient Vector Flow (...

2007
Antonis Daskalakis Dionisis A. Cavouras Panagiotis Bougioukos Spiros Kostopoulos Ioannis Kalatzis George C. Kagadis George Nikiforidis

A new method is proposed for improving microarray spot segmentation for gene quantification. The method introduces a novel combination of three image processing stages, applied locally to each spot image: i/ Fuzzy C-Means unsupervised clustering, for automatic spot background noise estimation, ii/ power spectrum deconvolution filter design, employing background noise information, for spot image...

2014
Ji Zhao Lina Zhang Minmin Yin

Medical image segmentation is one of the key technologies in computer aided diagnosis. Due to the complexity and diversity of medical images, the wavelet multi-scale analysis is introduced into GVF (gradient vector flow) snake model. The modulus values of each scale and phase angle values are calculated using wavelet transform, and the local maximum points of modulus values, which are the conto...

Journal: :Computer Vision and Image Understanding 2013
Huiyu Zhou Xuelong Li Gerald Schaefer M. Emre Celebi Paul C. Miller

In recent years, gradient vector flow (GVF) based algorithms have been successfully used to segment a variety of 2-D and 3-D imagery. However, due to the compromise of internal and external energy forces within the resulting partial differential equations, these methods may lead to biased segmentation results. In this paper, we propose MSGVF, a mean shift based GVF segmentation algorithm that c...

2013
Pedro M. Ferreira Teresa Mendonça Paula Rocha

Currently, there is a great interest in the development of computer-aided diagnosis (CAD) systems for dermoscopic images. The segmentation step is one of the most important ones, since its accuracy determines the eventual success or failure of a CAD system. In this paper, different kinds of algorithms for the automatic segmentation of skin lesions in dermoscopic images were implemented and eval...

2006
JUAN ZAPATA

Abstract: A hybrid snake algorithm is presented in this paper. The procedure is based on combining a dynamic balloon force, a GVF force and a traditional gradient force. The balloon force is modified in order to increase the capture range and convergence speed of active contour in a dynamic way. Our interest is to give the balloon force a bigger preponderance at the early of procedure and a sma...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد 1376

in this thesis our aim is to construct vector field in r3 for which the corresponding one-dimensional maps have certain discontinuities. two kinds of vector fields are considered, the first the lorenz vector field, and the second originally introced here. the latter have chaotic behavior and motivate a class of one-parameter families of maps which have positive lyapunov exponents for an open in...

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