نتایج جستجو برای: deformable environment

تعداد نتایج: 526354  

2010
T. Jund D. Cazier

We present in this paper a new approach to detect and precisely report the collisions and contacts between deformable moving bodies and their environment. The moving bodies are sampled as meshes whose vertices are followed up in a convex subdivision of the surrounding space. Particles are continuously spanned along the edges to detect collisions with cells of this subdivision. We report experim...

Journal: :Pattern Recognition Letters 2017
Sayan Ghosal Nilanjan Ray

Deformable registration is ubiquitous in medical image analysis. Many deformable registration methods minimize sum of squared difference (SSD) as the registration cost with respect to deformable model parameters. In this work, we construct a tight upper bound of the SSD registration cost by using a fully convolutional neural network (FCNN) in the registration pipeline. The upper bound SSD (UB-S...

Journal: :Studies in health technology and informatics 2005
Bhautik Joshi Bryan Lee Dan C Popescu Sébastien Ourselin

In this paper we present a technique for the modelling of realistic collisions between arbitrary rigid surgical tools and deformable geometry that is independent of the resolution of colliding objects. We use a spatial hash table to provide an efficient narrow-phase collision detection and modelling backend. This is combined with previous work on collision modelling in our surgical simulation e...

2013
Dmitry Berenson

I. INTRODUCTION We present a symmetry-based method that allows humans and robots to collaboratively manipulate deformable objects. The method does not require modeling and simulating deformation. Our method is based on the concept of diminishing rigidity, which we use to quickly compute an approximation to the Jacobian of the deformable object without using simulation. This Jacobian is used to ...

2003
Arnulph Fuhrmann Gerrit Sobottka Clemens Groß

In this paper we address the problem of rapid distance computation between rigid objects and highly deformable objects, which is important in the context of physically based modeling of e.g hair or clothing. Our method is in particular useful when modeling deformable objects with particle systems—the most common approach to simulate such objects. We combine some already known techniques about d...

2008
Paolo Fiorini Debora Botturi Maarja Kruusmaa

In this paper we summarize some of our research efforts in the area of high performance simulation to support advanced teleoperation. Simulation of rigid bodies has always been used in conjunction of teleoperation system, however simulation of deformable bodies is not available yet, since it presents a new set of challenges. In particular, we address the problems related to object modeling to a...

Journal: :journal of biomedical physics and engineering 0
s parande a esmaili torshabi

background: medical image interpolation is recently introduced as a helpful tool to obtain further information via initial available images taken by tomography systems. this information may be useful for better diagnosis of possible lesions or better tumor delineation at radiation treatment. to do this, deformable image registration algorithms are mainly utilized to perform image interpolation ...

Kourosh Hasanpur Masih Sonbolestan Mehdi Massah Mehdi Salmani Tehrani, Mehrdad Poursina,

In this study, dynamic behavior of safety mechanism of a mechanical controller is investigated using 3D-FE simulation. This paper is concentrated on controller of a high acceleration projectile. The controller is located in the top of the projectile. Safety mechanism is divided to deformable and rigid parts. Deformable and rigid parts are simulated in Abaqus and Adams commercial soft wares; res...

2005
Ghassan Hamarneh Chris McIntosh

Previously, “Deformable organisms” were introduced as a novel paradigm for medical image analysis that uses artificial life modelling concepts. Deformable organisms were designed to complement the classical bottomup deformable models methodologies (geometrical and physical layers), with top-down intelligent deformation control mechanisms (behavioral and cognitive layers). However, a true physic...

2003
Elsa Angelini Jeffrey Holmes Andrew Laine Shunichi Homma

This paper presents the implementation and validation of a new 3D deformable model method, based on the Mumford-Shah functional for segmentation of threedimensional real-time ultrasound. An experiment on 10 patients with primary hypertension was carried out to compare three segmentation methods for quantification of right and left ventricular ejection fraction: (1) manual tracing by an expert c...

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