نتایج جستجو برای: geometric changes

تعداد نتایج: 956095  

2013
Ying Tang Dong-Yan Wu Jing Fan

This paper proposes a computational approach to seasonal changes of living leaves by combining the geometric deformations and textural color changes. The geometric model of a leaf is generated by triangulating the scanned image of a leaf using an optimized mesh. The triangular mesh of the leaf is deformed by the improved mass-spring model, while the deformation is controlled by setting differen...

Journal: :Medical image computing and computer-assisted intervention : MICCAI ... International Conference on Medical Image Computing and Computer-Assisted Intervention 2011
Marc Niethammer Gabriel L. Hart Danielle F. Pace Paul M. Vespa Andrei Irimia John D. Van Horn Stephen R. Aylward

Standard image registration methods do not account for changes in image appearance. Hence, metamorphosis approaches have been developed which jointly estimate a space deformation and a change in image appearance to construct a spatio-temporal trajectory smoothly transforming a source to a target image. For standard metamorphosis, geometric changes are not explicitly modeled. We propose a geomet...

Journal: :Cerebral cortex 2017
Moira R Dillon Andrew S Persichetti Elizabeth S Spelke Daniel D Dilks

Diverse animal species primarily rely on sense (left-right) and egocentric distance (proximal-distal) when navigating the environment. Recent neuroimaging studies with human adults show that this information is represented in 2 scene-selective cortical regions-the occipital place area (OPA) and retrosplenial complex (RSC)-but not in a third scene-selective region-the parahippocampal place area ...

2015
Petronella M. Kager Sanne C. C. van Weerdenburg Simon R. van Kranen Suzanne van Beek Elisabeth A. Lamers-Kuijper Wilma D. Heemsbergen Olga Hamming-Vrieze Peter Remeijer

BACKGROUND Plan adaptation during the course of (chemo)radiotherapy of H&N cancer requires repeat CT scanning to capture anatomy changes such as parotid gland shrinkage. Hydration, applied to prevent nephrotoxicity from cisplatin, could temporarily alter the hydrogen balance and hence the captured anatomy. The aim of this study was to determine geometric changes of parotid glands as function of...

2008
J. S. Jackson D. Tozer M. Symms C. A. Wheeler-Kingshott

Introduction: Gradient coils may be replaced on MRI systems as part of hardware upgrades or as a result of hardware failure. These events could introduce a step change in longitudinal quantitative neuro-imaging studies. Gradient winding errors cause even nominally identical gradient coils to differ in their field. Additionally the precise alignment of the gradient coil in the magnet and the act...

2017
Patrick Oellers Inês Laíns Steven Mach Shady Garas Ivana K Kim Demetrios G Vvvas Joan W Miller Deeba Husain John B Miller

Purpose Eyes with age-related macular degeneration (AMD) often harbor pathological changes in the retinal periphery and perimacular region. These extramacular changes have not been well classified, but may be phenotypically and functionally relevant. The purpose of this study was to demonstrate a novel grid to systematically study peripheral retinal abnormalities in AMD using geometric distorti...

2002
Florica Mindru Theo Moons Luc Van Gool

In this paper we compare different ways of representing the photometric changes in image intensities caused by changes in illumination and viewpoint, aiming at a balance between goodness-of-fit and low complexity. We derive invariant features based on generalized color moment invariants – that can deal with geometric and photometric changes of a planar pattern – corresponding to the chosen phot...

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