Results 211 to 220 of about 473,711 (266)

Approximation of surfaces in quantitative 3-D reconstructions

IEEE Transactions on Biomedical Engineering, 1990
In serial section reconstructions a series of planar profiles are taken representing curves on the surface of the structure to be reconstructed. For a number of quantitative serial section methods, approximation of a surface is done by the formation of tiles between points of adjacent profiles. As generally proposed, finding this approximation has been
Robert R. Mercer, Gary M. McCauley, Satish Anjilvel   +2 more
openaire   +2 more sources

3-D Shape Reconstruction of Retinal Fundus

2006 IEEE Computer Society Conference on Computer Vision and Pattern Recognition - Volume 2 (CVPR'06), 2006
We present a method for 3-D shape reconstruction of retinal fundus from fluorescein images. Our method extracts the location of vessels’ bifurcation as a reliable feature for estimating the epipolar geometry using a plane-and-parallax approach. The proposed solution robustly estimates the fundamental matrix for nearly planar surfaces, such as the ...
Tae Eun Choe, Isaac Cohen, Gérard G. Medioni   +2 more
openaire   +1 more source

Multiple view 3-D reconstruction in water

2015 Fifth National Conference on Computer Vision, Pattern Recognition, Image Processing and Graphics (NCVPRIPG), 2015
This paper presents a camera model to deal with underwater scene reconstruction from multiple images. Effects due to change in path of light ray at the medium interface is modelled for a general medium with unknown refractive index. Our model calculates the refractive index of the medium and simultaneously removes the geometric refraction effects in ...
Santanu Chaudhury, Tarun Agarwal, Pranjal Maheshwari   +2 more
openaire   +1 more source

HiPER 3-D: An Omnidirectional Sensor for High Precision Environmental 3-D Reconstruction

IEEE Transactions on Industrial Electronics, 2012
The environmental 3-D reconstruction is a strategic task in many contexts, above all, in infrastructure inspection and vehicle/robot automatic motion. In this paper, we present a patented sensor capable to recover 3-D data with a very high profile acquisition rate and perform an omnidirectional highly accurate environmental reconstruction: these skills
Marino Francescomaria, De Ruvo Pasquale, De Ruvo Gianluigi, Nitti Massimiliano, Stella Ettore   +4 more
openaire   +3 more sources

Stereoscopic System for 3-D Seabed Mosaic Reconstruction

2007 IEEE International Conference on Image Processing, 2007
This paper presents an inexpensive framework for 3-D seabed mosaic reconstruction, based on an asynchronous stereo vision system when simplifying motion assumptions are used. In order to achieve a metric reconstruction some knowledge about the scene is recovered by a simple and reliable calibration step.
A Leone, G Diraco, C Distante
openaire   +2 more sources

Interior-point methodology for 3-D PET reconstruction

IEEE Transactions on Medical Imaging, 2000
Interior-point methods have been successfully applied to a wide variety of linear and nonlinear programming applications. This paper presents a class of algorithms, based on path-following interior-point methodology, for performing regularized maximum-likelihood (ML) reconstructions on three-dimensional (3-D) emission tomography data.
Calvin A. Johnson, Jürgen Seidel, Ariela Sofer   +2 more
openaire   +2 more sources

Development of a vertebral endplate 3-D reconstruction technique

IEEE Transactions on Medical Imaging, 1997
The increase of low back problems has stimulated the development of different analysis and evaluation techniques. Among these methods, the direct linear transformation (DLT) technique is commonly used to reconstruct the spine in three dimensions by means of its known image coordinates on radiographs.
Tuong Ngoc Huynh, Jean Dansereau, Gilles Maurais   +2 more
openaire   +2 more sources

3-D reconstruction of coronary arteries

Proceedings of 16th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2002
Coronary arteriography is a technique used for evaluating the state of the coronary arteries. Matching of coronary arteries from multiple views is necessary for obtaining a 3-D (three dimensional) description of the arterial tree. Overlapping vessels and artifacts due to digital subtraction of the angiogram background make the matching process quite ...
A. Sarwal, A.P. Dhawan
openaire   +1 more source

Camera-Radar Fusion for 3-D Depth Reconstruction

2020 IEEE Intelligent Vehicles Symposium (IV), 2020
We introduce and study the problem of camera-radar fusion for 3-D depth reconstruction. This problem is motivated by autonomous driving applications, in which we can expect to have access to both front-facing camera and radar sensors. These two sensors are complementary in several respects: the camera is a passive sensor measuring azimuth and elevation;
Urs Niesen, Jayakrishnan Unnikrishnan
openaire   +1 more source

Tomographic reconstruction of 3-D vector fields

IEEE International Conference on Acoustics Speech and Signal Processing, 1993
Inner product probe measurements are defined for tomographic reconstruction of 3-D vector fields. General conditions and formulas for reconstruction of an arbitrary vector field are given, as are the conditions and formulas for fields known to be either irrotational or solenoidal.
openaire   +2 more sources