Download or read book Mod les de recalage classifiant pour l imagerie m dicale written by Mohamed Hachama and published by . This book was released on 2008 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans cette thèse, nous avons traité un problème rencontré en recalage d'images médicales. Il s'agit de la présence de plusieurs classes de pixels ayant des propriétés de changement de niveau de gris différentes (lorsqu'on injecte un agent de contraste par exemple). Ceci n'est pas conforme aux hypothèses sur lesquelles reposent la majorité des termes de similarité utilisés dans la littérature. Pour résoudre ce problème, nous avons proposé trois modèles. Pour recaler deux images, les deux premiers modèles reposent sur la description des variations des niveaux de gris entre les deux images par un mélange de deux distributions de probabilité, qui correspondent à deux classes de pixels. La pondération entre les deux composantes du mélange est faite à l'aide d'une carte de probabilité décrivant la localisation spatiale des pixels de la deuxième classe. Cette carte de probabilité est fixée dans le premier modèle, ce qui permet d'avoir un modèle de recalage qui tient compte de la présence de deux classes. Dans le deuxième modèle, la carte de probabilité est estimée en même temps que le recalage, conduisant ainsi à la combinaison de la détection (ou segmentation) et du recalage. Le troisième modèle concerne les séquences d'images dynamiques d'agent de contraste. Le modèle proposé se base sur une classification des pixels en fonction de leur courbes de rehaussement dynamiques et l'estimation de ces dernières pour chaque classe. Les trois modèles ont été appliqués à des images réelles et simulées.

Download or read book Image Registration written by A. Ardeshir Goshtasby and published by Springer Science & Business Media. This book was released on 2012-01-11 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a thorough and detailed guide to image registration, outlining the principles and reviewing state-of-the-art tools and methods. The book begins by identifying the components of a general image registration system, and then describes the design of each component using various image analysis tools. The text reviews a vast array of tools and methods, not only describing the principles behind each tool and method, but also measuring and comparing their performances using synthetic and real data. Features: discusses similarity/dissimilarity measures, point detectors, feature extraction/selection and homogeneous/heterogeneous descriptors; examines robust estimators, point pattern matching algorithms, transformation functions, and image resampling and blending; covers principal axes methods, hierarchical methods, optimization-based methods, edge-based methods, model-based methods, and adaptive methods; includes a glossary, an extensive list of references, and an appendix on PCA.

Download or read book Earth Surface Processes Landforms and Sediment Deposits written by John Bridge and published by Cambridge University Press. This book was released on 2008-05 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A unique, advanced textbook combining sedimentology and geomorphology in a comprehensive and integrated way.

Download or read book Computer Assisted Orthopedic Surgery CAOS written by R. Ganz and published by Seattle ; Toronto : Hogrefe & Huber. This book was released on 1999 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes early progress in computer-assisted orthopedic surgery made in the past few years, and is composed of 26 papers presented during the 1995 and 1996 CAOS-Symposia held at the University of Bern. Well-illustrated, the volume reviews the planning, simulation and execution of surgery in different anatomical areas, and presents various surgical techniques, such as joint reconstruction and replacement, trauma fixation, and minimally invasive approaches. In addition to orthopedic surgeons, the book is aimed at senior level engineering and applied science students interested in the research field. No index. Annotation copyrighted by Book News, Inc., Portland, OR

Download or read book Cities at Risk written by Helene Joffe and published by Springer Science & Business Media. This book was released on 2013-03-27 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the major growth of the world’s population over the past century, as well as rapid urbanisation, people increasingly live in crowded cities. This trend is often accompanied by proliferation of poorly built housing, uncontrolled use of land, occupation of unsafe environments and overstretched services. When a natural hazard strikes such a city many people are vulnerable to loss of life and property. This book explores what these people think and feel about the threats that they face. How do they live with perils ranging from earthquakes to monsoons, from floods to hurricanes, in the 21st century? The authors are drawn from a large range of disciplines: Psychology, Engineering, Geography, Anthropology and Urban Planning. They also reflect on how perils are represented in multiple cultures: the United States, Japan, Turkey, Bangladesh, the United Kingdom and New Zealand. The book therefore not only brings to light the ways that different cultures represent natural hazards but also the different ways in which various disciplines write about living with perils in the 21st century. The book is addressed both to researchers and to organizations involved with risk management and risk mitigation.

Download or read book Land Ocean Interaction written by D. Huntley and published by IWA Publishing. This book was released on 2000-12-01 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The UK Land-Ocean Interaction Study (LOIS) provided a major opportunity to measure and model the processes controlling the fluxes of materials between river basins and coastal seas. The main programme of research took place between 1992 and 1998, funded by the UK Natural Environment Research Council, and involved approximately 360 coastal researchers contributing to more than 70 collaborative projects. This book presents accessible summaries of key results of this research. The ten chapters of the book are written by leading contributors to the programme, and cover aspects of the physical, sedimentological, chemical and biological processes controlling fluxes between river catchments and coastal seas in temporate environments. Major overarching themes for all of the chapters include the persistence, storage, degradation and transport of pollutants from catchment to coastal sea, and an emphasis on the relevance of research for river and coastal water quality management. The chapters also describe a number of important technological advances in the measurement of processes and longer term monitoring of the fluvial, estuarine and coastal environments. Approaches to monitoring were also transferred between disciplines, in many cases for the first time. The rivers and coastal programme of LOIS was unique in its scale and inter-disciplinarity and its results are of lasting value. This book provides a useful and important summary of many of its results and an effective introduction to the research for those who want to delve more deeply into the data and published papers. It will be of interest to scientists, environmental managers and scientific policy makers. Contents Background and Context of the Programme River and Estuary Management Issues in the Humber Catchment Suspended Sediment Fluxes from River Basins River Chemistry Modelling of Large-Scale River Basins Tidal Reaches Estuarine Sediments The Intertidal Zone The Holderness Coast Estuarine Chemistry