Scanning and acquisition methods produce highly detailed surface meshes that need multi-chart parameterizations to reduce stretching and distortion. From these complex shape surfaces, high-quality approximations are automatically generated by using surface simplification techniques. Multi-chart textures hinder the quality of the simplification of these techniques for two reasons: either the cha...

PURPOSE To determine the variability in assessment of the principal inherent characteristics of intracranial aneurysms through the evaluation of interobserver variability for material with uniform quality. METHODS Blinded interpretations of a single set of cerebral arteriograms of 55 aneurysms were evaluated by several statistical approaches. RESULTS Excellent correlations were found for th...

While geometric attacks are one of the most challenging problems in watermarking, random bending is the most difficult to handle among all geometric attacks. Such attacks are difficult to correct by traditional parameter estimation or registration approaches. In this paper, we present a watermarking scheme based on a deformable mesh model to combat such attacks. The distortion is corrected usin...

This paper describes how geometric distortion correction and image processing operation can be performed in realtime on an IVIP system. The IVIP is a modified version of RVIP RVIP is currently being manufactured and it is going to be used for radar signal processing. The IVP is targeted to perform the time consuming first stages of image processing. This includes geometric distortion correction...

Although the discrete Fourier transform (DFT) precoded Alamouti (DPA) scheme with limited feedback offers numerous benefits in the Rayleigh fading channel, this scheme inherently generates geometric mean distortion due to the error exponential of the DFT precoding (DP). Consequently, the receiver suddenly losses the average received channel power. Instead of the conventional DPA scheme, we prop...

Introduction: With the advent of short-TE acquisitions, such as UTE and SWIFT, center-out radial acquisition schemes to fill k-space are gaining interest [1, 2]. Although these acquisitions minimize signal dephasing, they still suffer from field inhomogeneities through geometric distortion. Unlike for Cartesian encoding, geometric distortion for center-out radial acquisitions is directed radial...

In this paper we explore some implications of viewing graphs as geometric objects. This approach offers a new perspective on a number of graph-theoretic and algorithmic problems. There are several ways to model graphs geometrically and our main concern here is with geometric representations that respect the metric of the (possibly weighted) graph. Given a graph G we map its vertices to a normed...

One of the problems for audio watermarks is robustness against signal processing causing de-synchronization of the pseudo-random sequences. To tackle the problem, we previously introduced an audio watermarking method using a two-dimensional pseudo-random array, which is robust against pitch shifting and random stretching to some extent. In this paper, we explain a modification to the detection ...

In view of their superior soft tissue contrast compared to computed tomography, magnetic resonance images are commonly involved in stereotactic radiosurgery/radiotherapy applications for target delineation purposes. It is known, however, that magnetic resonance images are geometrically distorted, thus deteriorating dose delivery accuracy. The present work focuses on the assessment of geometric ...

The purpose of this study was to determine the impact of magnetic resonance imaging (MRI) geometric distortions when using MRI for target delineation and planning for whole-breast, intensity-modulated radiotherapy (IMRT). Residual system distortions and combined systematic and patient-induced distortions are considered. This retrospective study investigated 18 patients who underwent whole-breas...