Results 1 - 10 of 5,337

Nonrigid registration using free-form deformations: Application to breast MR images

by D. Rueckert, L. I. Sonoda, C. Hayes, D. L. G. Hill, M. O. Leach, D. J. Hawkes - IEEE Transactions on Medical Imaging , 1999
"... Abstract — In this paper we present a new approach for the nonrigid registration of contrast-enhanced breast MRI. A hierarchical transformation model of the motion of the breast has been developed. The global motion of the breast is modeled by an affine transformation while the local breast motion i ..."
Abstract - Cited by 697 (36 self) - Add to MetaCart
is described by a free-form deformation (FFD) based on B-splines. Normalized mutual information is used as a voxel-based similarity measure which is insensitive to intensity changes as a result of the contrast enhancement. Registration is achieved by minimizing a cost function, which represents a combination

registration

by Joris Vergeest, Thomas Kroes, Wolf Song
"... To make 3D scanning an attractive tool for incidental or inexperienced users, the process of scan view registration should be avoided or significantly simplified. If a 6 DoF sensor is attached to the object to be scanned, additional data about each of the 3D views can be supplied to the registration ..."
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To make 3D scanning an attractive tool for incidental or inexperienced users, the process of scan view registration should be avoided or significantly simplified. If a 6 DoF sensor is attached to the object to be scanned, additional data about each of the 3D views can be supplied

Data Gathering Algorithms in Sensor Networks Using Energy Metrics

by Stephanie Lindsey, Cauligi Raghavendra, Krishna M. Sivalingam - IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS , 2002
"... Sensor webs consisting of nodes with limited battery power and wireless communications are deployed to collect useful information from the field. Gathering sensed information in an energy efficient manner is critical to operating the sensor network for a long period of time. In [12], a data collecti ..."
Abstract - Cited by 226 (2 self) - Add to MetaCart
-heads chosen to transmit to the base station, LEACH achieves a factor of 8 improvement compared to direct transmissions, as measured in terms of when nodes die. An improved version of LEACH, called LEACH-C, is presented in [14], where the central base station performs the clustering to improve energy

Matching 3D Models with Shape Distributions

by Robert Osada, et al. , 2001
"... Measuring the similarity between 3D shapes is a fundamental problem, with applications in computer vision, molecular biology, computer graphics, and a variety of other fields. A challenging aspect of this problem is to find a suitable shape signature that can be constructed and compared quickly, whi ..."
Abstract - Cited by 215 (7 self) - Add to MetaCart
Measuring the similarity between 3D shapes is a fundamental problem, with applications in computer vision, molecular biology, computer graphics, and a variety of other fields. A challenging aspect of this problem is to find a suitable shape signature that can be constructed and compared quickly

Robust Registration of 2D and 3D Point Sets

by Andrew W Fitzgibbon , 2001
"... This paper introduces a new method of registering point sets. The registration error is directly minimized using general-purpose nonlinear optimization (the Levenberg-Marquardt algorithm). The surprising conclusion of the paper is that this technique is comparable in speed to the special-purpose ICP ..."
Abstract - Cited by 147 (0 self) - Add to MetaCart
This paper introduces a new method of registering point sets. The registration error is directly minimized using general-purpose nonlinear optimization (the Levenberg-Marquardt algorithm). The surprising conclusion of the paper is that this technique is comparable in speed to the special

Shape and motion from image streams: a factorization method - 2. point features in 3d motion.

by Carlo Tomasi , Takeo Kanade , 1991
"... Abstract The factorization method described in this series of reports requires an algorithm to track the motion of features in an image stream. Given the small inter-frame displacement made possible by the factorization approach, the best tracking method turns out to be the one proposed by Lucas an ..."
Abstract - Cited by 219 (13 self) - Add to MetaCart
intensities leads to a Newton-Raphson style minimization. In this report, after rederiving the method in a physically intuitive way, we answer the crucial question of how to choose the feature windows that are best suited for tracking. Our selection criterion is based directly on the definition

A Directionality based Location Discovery Scheme for Wireless Sensor Networks

by Asis Nasipuri, Kai Li , 2002
"... A sensor network i a large ad hoc network of densely diN tri buted sensors that are equi pped wi th low power wi reless transcei ers. Such networks can be appli9 for cooperati e si gnal detecti on, moni tori ng, and tracki ng, and are especiN3N useful for appli(# i s i remote or hazardous locati on ..."
Abstract - Cited by 127 (1 self) - Add to MetaCart
A sensor network i a large ad hoc network of densely diN tri buted sensors that are equi pped wi th low power wi reless transcei ers. Such networks can be appli9 for cooperati e si gnal detecti on, moni tori ng, and tracki ng, and are especiN3N useful for appli(# i s i remote or hazardous locati

Exposure In Wireless Ad-Hoc Sensor Networks

by Seapahn Meguerdichian, Farinaz Koushanfar, Gang Qu, Miodrag Potkonjak , 2001
"... Wireless ad-hoc sensor networks will provide one of the missing connections between the Internet and the physical world. One of the fundamental problems in sensor networks is the calculation of coverage. Exposure is directly related to coverage in that it is a measure of how well an object, moving o ..."
Abstract - Cited by 156 (3 self) - Add to MetaCart
Wireless ad-hoc sensor networks will provide one of the missing connections between the Internet and the physical world. One of the fundamental problems in sensor networks is the calculation of coverage. Exposure is directly related to coverage in that it is a measure of how well an object, moving

Fully Automatic Registration Of Multiple 3D Data Sets

by Daniel Huber, Martial Hebert , 2001
"... This paper presents a method for automatically registering multiple three dimensional (3D) data sets. Previous approaches required manual specification of initial pose estimates or relied on external pose measurement systems. In contrast, our method does not assume any knowledge of initial poses or ..."
Abstract - Cited by 101 (5 self) - Add to MetaCart
This paper presents a method for automatically registering multiple three dimensional (3D) data sets. Previous approaches required manual specification of initial pose estimates or relied on external pose measurement systems. In contrast, our method does not assume any knowledge of initial poses

Image-Based BRDF Measurement Including Human Skin

by Stephen R. Marschner , Stephen H. Westin, Eric P. F. Lafortune, Kenneth E. Torrance, Donald P. Greenberg
"... We present a new image-based process for measuring the bidirectional reflectance of homogeneous surfaces rapidly, completely, and accurately. For simple sample shapes (spheres and cylinders) the method requires only a digital camera and a stable light source. Adding a 3D scanner allows a wide cla ..."
Abstract - Cited by 143 (2 self) - Add to MetaCart
We present a new image-based process for measuring the bidirectional reflectance of homogeneous surfaces rapidly, completely, and accurately. For simple sample shapes (spheres and cylinders) the method requires only a digital camera and a stable light source. Adding a 3D scanner allows a wide
Results 1 - 10 of 5,337