Results 1 - 10 of 658

Two-Dimensional PCA: A New Approach to Appearance-Based Face Representation and Recognition

by Jian Yang, David Zhang, Senior Member, Ro F. Frangi, Jing-yu Yang - IEEE Trans. Pattern Anal. Machine Intell , 2004
"... Abstract—In this paper, a new technique coined two-dimensional principal component analysis (2DPCA) is developed for image representation. As opposed to PCA, 2DPCA is based on 2D imagematrices rather than 1D vectors so the image matrix does not need to be transformed into a vector prior to feature e ..."
Abstract - Cited by 327 (13 self) - Add to MetaCart
Abstract—In this paper, a new technique coined two-dimensional principal component analysis (2DPCA) is developed for image representation. As opposed to PCA, 2DPCA is based on 2D imagematrices rather than 1D vectors so the image matrix does not need to be transformed into a vector prior to feature

Edge Detection and Ridge Detection with Automatic Scale Selection

by Tony Lindeberg - CVPR'96 , 1996
"... When extracting features from image data, the type of information that can be extracted may be strongly dependent on the scales at which the feature detectors are applied. This article presents a systematic methodology for addressing this problem. A mechanism is presented for automatic selection of ..."
Abstract - Cited by 347 (24 self) - Add to MetaCart
When extracting features from image data, the type of information that can be extracted may be strongly dependent on the scales at which the feature detectors are applied. This article presents a systematic methodology for addressing this problem. A mechanism is presented for automatic selection

Automated 3-D Extraction of Inner and Outer Surfaces of Cerebral Cortex from MRI

by David MacDonald, Noor Kabani, David Avis, Alan C. Evans - NEUROIMAGE , 2000
"... Automatic computer processing of large multidimensional images such as those produced by magnetic resonance imaging (MRI) is greatly aided by deformable models, which are used to extract, identify, and quantify specific neuroanatomic structures. A general method of deforming polyhedra is presented h ..."
Abstract - Cited by 181 (17 self) - Add to MetaCart
gray matter from normal human MR images, accurately locating the depths of the sulci, even where noise and partial volume artifacts in the image obscure the visibility of sulci. The extracted surfaces are enforced to be simple two-dimensional manifolds (having the topology of a sphere), even though

Subxiphoid Two-dimensional Echocardiographic Diagnosis of Double-chambered Right Ventricle

by unknown authors
"... SUMMARY The echocardiographic features of 14 patients with double-chambered right ventricle are presented. Diagnosis was confirmed in 13 patients at cardiac catheterization and in one at necropsy. The ultrasonic diagnosis was based on the visualization in subxiphoid short-axis view of an anomalous m ..."
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SUMMARY The echocardiographic features of 14 patients with double-chambered right ventricle are presented. Diagnosis was confirmed in 13 patients at cardiac catheterization and in one at necropsy. The ultrasonic diagnosis was based on the visualization in subxiphoid short-axis view of an anomalous

Two-dimensional ESPRIT with tracking for radar imaging and feature extraction

by M. L. Burrows, M. L. Burrows - IEEE Transactions on Antennas and Propagation
"... This report may be reproduced to satisfy needs of U.S. Government agencies. The ESC Public Affairs Office has reviewed this report, and ..."
Abstract - Cited by 4 (0 self) - Add to MetaCart
This report may be reproduced to satisfy needs of U.S. Government agencies. The ESC Public Affairs Office has reviewed this report, and

Two dimensional echocardiographic diagnosis of situs

by James C Huhta, Jeffrey F Smallhorn, Fergus J Macartney
"... SUMMARY At present there is no reliable method of recognising atrial isomerism by two dimensional echocardiography. We therefore used two dimensional echocardiography to examine 158 patients including 25 with atrial isomerism and four with situs inversus. Particular attention was paid to the short a ..."
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SUMMARY At present there is no reliable method of recognising atrial isomerism by two dimensional echocardiography. We therefore used two dimensional echocardiography to examine 158 patients including 25 with atrial isomerism and four with situs inversus. Particular attention was paid to the short

ORIGINAL PAPER Transthoracic two-dimensional xPlane and three-dimensional echocardiographic analysis of the site of mitral valve prolapse

by Jackie S. Mcghie, Lotte Groot-de, Laat Ben, Ren Wim Vletter, Rene Frowijn, Frans Oei, Marcel L. Geleijnse
"... Abstract This study sought to assess the value of two-dimensional (2D) transthoracic echocardiography (TTE), 2D xPlane imaging and three-dimensional (3D) TTE for the definition of the site and the extent of mitral valve (MV) prolapse. Fifty patients underwent transthoracic 2D, 2D xPlane and 3D echoc ..."
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Abstract This study sought to assess the value of two-dimensional (2D) transthoracic echocardiography (TTE), 2D xPlane imaging and three-dimensional (3D) TTE for the definition of the site and the extent of mitral valve (MV) prolapse. Fifty patients underwent transthoracic 2D, 2D xPlane and 3D

Wall Position and Thickness Estimation from Sequences of Echocardiographic Images

by José M. B. Dias, José M. N. Leitão - IEEE TRANS. MED. IMAG , 1996
"... This paper presents a new method for endocardial (inner) and epicardial (outer) contour estimation from sequences of echocardiographic images. The framework herein introduced is fine-tuned for parasternal short axis views at the papillary muscle level. The underlying model is probabilistic# it captu ..."
Abstract - Cited by 34 (3 self) - Add to MetaCart
# it captures the relevant features of the image generation physical mechanisms and of the heart morphology. Contour sequences are assumed two-dimensional noncausal first order Markov random processes# each variable has a spatial index and a temporal index. The image pixels are modelled as Rayleigh distributed

Efficient Iris Recognition by Characterizing Key Local Variations

by Li Ma, Tieniu Tan, Yunhong Wang, Dexin Zhang - IEEE Trans. on Image Processing , 2004
"... Abstract—Unlike other biometrics such as fingerprints and face, the distinct aspect of iris comes from randomly distributed features. This leads to its high reliability for personal identification, and at the same time, the difficulty in effectively representing such details in an image. This paper ..."
Abstract - Cited by 165 (8 self) - Add to MetaCart
extraction includes two steps: 1) a set of one-dimensional intensity signals is constructed to effectively characterize the most important information of the original two-dimensional image; 2) using a particular class of wavelets, a position sequence of local sharp variation points in such signals

Directional multiresolution image representations

by Minh N. Do , 2001
"... Efficient representation of visual information lies at the foundation of many image processing tasks, including compression, filtering, and feature extraction. Efficiency of a representation refers to the ability to capture significant information of an object of interest in a small description. For ..."
Abstract - Cited by 131 (10 self) - Add to MetaCart
schemes that can capture the intrinsic geometrical structure of pictorial information. This thesis focuses on the development of new “true ” two-dimensional representations for images. The emphasis is on the discrete framework that can lead to algorithmic implementations. The first method constructs
Results 1 - 10 of 658