Results 1 - 10 of 2,547

Scale-space and edge detection using anisotropic diffusion

by Pietro Perona, Jitendra Malik - IEEE Transactions on Pattern Analysis and Machine Intelligence , 1990
"... Abstract-The scale-space technique introduced by Witkin involves generating coarser resolution images by convolving the original image with a Gaussian kernel. This approach has a major drawback: it is difficult to obtain accurately the locations of the “semantically mean-ingful ” edges at coarse sca ..."
Abstract - Cited by 1887 (1 self) - Add to MetaCart
. The algorithm involves elementary, local operations replicated over the image making parallel hardware implementations feasible. Index Terms-Adaptive filtering, analog VLSI, edge detection, edge enhancement, nonlinear diffusion, nonlinear filtering, parallel algo-

Fast Bilateral Filtering for the Display of High-Dynamic-Range Images

by Frédo Durand, Julie Dorsey , 2002
"... We present a new technique for the display of high-dynamic-range images, which reduces the contrast while preserving detail. It is based on a two-scale decomposition of the image into a base layer, encoding large-scale variations, and a detail layer. Only the base layer has its contrast reduced, the ..."
Abstract - Cited by 453 (10 self) - Add to MetaCart
, thereby preserving detail. The base layer is obtained using an edge-preserving filter called the bilateral filter. This is a non-linear filter, where the weight of each pixel is computed using a Gaussian in the spatial domain multiplied by an influence function in the intensity domain that decreases

Numerical methods for image registration

by Eldad Haber, Jan Modersitzki, Eldad Haber , 2004
"... In this paper we introduce a new framework for image registration. Our formulation is based on consistent discretization of the optimization problem coupled with a multigrid solution of the linear system which evolve in a Gauss-Newton iteration. We show that our discretization is h-elliptic independ ..."
Abstract - Cited by 209 (29 self) - Add to MetaCart
-elliptic independent of parameter choice and therefore a simple multigrid implementation can be used. To overcome potential large nonlinearities and to further speed up computation, we use a multilevel continuation technique. We demonstrate the efficiency of our method on a realistic highly nonlinear registration

A Pyramid Approach to Sub-Pixel Registration Based on Intensity

by Philippe Thevenaz, Urs Ruttiman, Michal Unser , 1998
"... We present an automatic sub-pixel registration algorithm that minimizes the mean square intensity difference between a reference and a test data set, which can be either images (2-D) or volumes (3-D). It uses an explicit spline representation of the images in conjunction with spline processing, and ..."
Abstract - Cited by 237 (18 self) - Add to MetaCart
We present an automatic sub-pixel registration algorithm that minimizes the mean square intensity difference between a reference and a test data set, which can be either images (2-D) or volumes (3-D). It uses an explicit spline representation of the images in conjunction with spline processing

Fast Fluid Registration of Medical Images

by Morten Bro-nielsen, Claus Gramkow , 1996
"... . This paper offers a new fast algorithm for non-rigid Viscous Fluid Registration of medical images that is at least an order of magnitude faster than the previous method by Christensen et al. [4]. The core algorithm in the fluid registration method is based on a linear elastic deformation of the ve ..."
Abstract - Cited by 169 (1 self) - Add to MetaCart
of the velocity field of the fluid. Using the linearity of this deformation we derive a convolution filter which we use in a scalespace framework. We also demonstrate that the 'demon'-based registration method of Thirion [13] can be seen as an approximation to the fluid registration method and point

AN ADAPTIVE FILTERING FRAMEWORK FOR IMAGE REGISTRATION

by Gulcin Caner A, A. Murat Tekalp A, Gaurav Sharma A, Wendi Heinzelman A
"... Image registration is a fundamental task in both image processing and computer vision. Here, we present a novel method for local image registration based on adaptive filtering techniques. We utilize an adaptive filter to estimate and track correspondences among multiple images containing overlapping ..."
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Image registration is a fundamental task in both image processing and computer vision. Here, we present a novel method for local image registration based on adaptive filtering techniques. We utilize an adaptive filter to estimate and track correspondences among multiple images containing

An Adaptive Filtering Framework For Image Registration

by Gulcin Caner Murat, A. Murat Tekalp A, Gaurav Sharma A, Wendi Heinzelman A
"... Image registration is a fundamental task in both image processing and computer vision. Here, we present a novel method for local image registration based on adaptive filtering techniques. We utilize an adaptive filter to estimate and track correspondences among multiple images containing overlapping ..."
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Image registration is a fundamental task in both image processing and computer vision. Here, we present a novel method for local image registration based on adaptive filtering techniques. We utilize an adaptive filter to estimate and track correspondences among multiple images containing

An Adaptive Color-Based Particle Filter

by Katja Nummiaro, Esther Koller-Meier, Luc Van Gool , 2002
"... Robust real-time tracking of non-rigid objects is a challenging task. Particle filtering has proven very successful for non-linear and nonGaussian estimation problems. The article presents the integration of color distributions into particle filtering, which has typically been used in combination wi ..."
Abstract - Cited by 160 (5 self) - Add to MetaCart
Robust real-time tracking of non-rigid objects is a challenging task. Particle filtering has proven very successful for non-linear and nonGaussian estimation problems. The article presents the integration of color distributions into particle filtering, which has typically been used in combination

Adaptive Local Image Registration: Analysis on Filter Size

by Vishnukumar S
"... Abstract—Adaptive Local Image Registration is a Local Image Registration based on an Adaptive Filtering frame work. A filter of appropriate size convolves with reference image and gives the pixel values corresponding to the distorted image and the filter is updated in each stage of the convolution. ..."
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Abstract—Adaptive Local Image Registration is a Local Image Registration based on an Adaptive Filtering frame work. A filter of appropriate size convolves with reference image and gives the pixel values corresponding to the distorted image and the filter is updated in each stage of the convolution

Locating blood vessels in retinal images by piecewise threshold probing of a matched filter response

by Adam Hoover, Valentina Kouznetsova, Michael Goldbaum - IEEE Transactions on Medical Imaging , 2000
"... Abstract—We describe an automated method to locate and outline blood vessels in images of the ocular fundus. Such a tool should prove useful to eye care specialists for purposes of patient screening, treatment evaluation, and clinical study. Our method differs from previously known methods in that i ..."
Abstract - Cited by 194 (2 self) - Add to MetaCart
improvement, with the same false positive rate, over our method. We are making all our images and hand labelings publicly available for interested researchers to use in evaluating related methods. Index Terms—Adaptive thresholding, blood vessel segmentation, matched filter, retinal imaging. I.
Results 1 - 10 of 2,547