Enhanced Perception In Volume Visualization
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Enhanced Perception In Volume Visualization
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Author : José Díaz Iriberri
language : en
Publisher:
Release Date : 2013
Enhanced Perception In Volume Visualization written by José Díaz Iriberri and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Due to the nature of scientic data sets, the generation of convenient visualizations may be a difficult task, but crucial to correctly convey the relevant information of the data. When working with complex volume models, such as the anatomical ones, it is important to provide accurate representations, since a misinterpretation can lead to serious mistakes while diagnosing a disease or planning surgery. In these cases, enhancing the perception of the features of interest usually helps to properly understand the data. Throughout years, researchers have focused on different methods to improve the visualization of volume data sets. For instance, the definition of good transfer functions is a key issue in Volume Visualization, since transfer functions determine how materials are classified. Other approaches are based on simulating realistic illumination models to enhance the spatial perception, or using illustrative effects to provide the level of abstraction needed to correctly interpret the data. This thesis contributes with new approaches to enhance the visual and spatial perception in Volume Visualization. Thanks to the new computing capabilities of modern graphics hardware, the proposed algorithms are capable of modifying the illumination model and simulating illustrative motifs in real time. In order to enhance local details, which are useful to better perceive the shape and the surfaces of the volume, our first contribution is an algorithm that employs a common sharpening operator to modify the lighting applied. As a result, the overall contrast of the visualization is enhanced by brightening the salient features and darkening the deeper regions of the volume model. The enhancement of depth perception in Direct Volume Rendering is also covered in the thesis. To do this, we propose two algorithms to simulate ambient occlusion: a screen-space technique based on using depth information to estimate the amount of light occluded, and a view-independent method that uses the density values of the data set to estimate the occlusion. Additionally, depth perception is also enhanced by adding halos around the structures of interest. Maximum Intensity Projection images provide a good understanding of the high intensity features of the data, but lack any contextual information. In order to enhance the depth perception in such a case, we present a novel technique based on changing how intensity is accumulated. Furthermore, the perception of the spatial arrangement of the displayed structures is also enhanced by adding certain colour cues. The last contribution is a new manipulation tool designed for adding contextual information when cutting the volume. Based on traditional illustrative effects, this method allows the user to directly extrude structures from the cross-section of the cut. As a result, the clipped structures are displayed at different heights, preserving the information needed to correctly perceive them.
Perceptually Based And Feature Guided Techniques For Multimodal Volume Visualization
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Author : Lin Zheng
language : en
Publisher:
Release Date : 2017
Perceptually Based And Feature Guided Techniques For Multimodal Volume Visualization written by Lin Zheng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Multimodal imaging is increasingly being used to obtain more robust information about the subject under study. Some examples include using MRI and PET scans in neuro-imaging; MRI/CT and PET in small animal imaging; CT and ultrasound in industrial nondestructive testing (NDT). Visualization of multimodal volume datasets presents several challenges. First, rendering multimodal volume data simultaneously demands more computer memory space. Second, since the data obtained from different modalities are to be visualized together, registration of the data must be properly done. Third, perceiving the shape and spatial structure of a feature in one volume can be impacted by the presence of the other volume when they are superimposed for rendering. Finally, how a visualization system properly supports the user's objective, be it validation, analysis, diagnosis, or presentation of the multimodal data, remains to be studied. In this dissertation, I aim to develop visualization techniques in order to greatly enhance the user's ability to interpret and present multimodal volume datasets in a perceptually efficient way. The datasets used in my study are already registered. First, I develop feature-guided methods that can achieve effective focus+context volume visualization. In my preliminary study, I devise a quantification of visibility for the region of interest, indicated by volume data from one modality such as PET, then visualize volume data from the other modality such as MRI with differentiated levels of focus+context setting based on the visibility information. With local illumination (Blinn-Phong lighting), it is hard to distinguish the depth relationship. With global illumination, we need to carefully design the lighting sources to avoid underexposed areas because of the complicated structures. The absence of depth perception and difficulty in lighting design inspired the following research in perceptually based enhancements. I propose to identify and adopt perceptually based principles or theories introduced by visual perception researchers in the design of methods for enhancing depth, shape, and lightness perception. In my preliminary study on single modal data, I am able to obtain improved perception of the depth ordering of semitransparent surfaces by optimizing an energy function based on quantitative perception models measuring the quality of the resulting images. To learn the lighting effect, I deploy these methods to a study on wrist rheumatoid arthritis for practical estimation. The results of global illumination and local illumination are complementary according to the expert users. Thus, a lightness anchoring hypothesis, the Highest-Luminance-As-White rule, is adjusted to adapt the volume visualization enhancement with global and local illumination results to enhance the underexposed areas. Perceptually based visualization with complicated structures is more efficient than existing methods that adding extra visual cues and more rendering resources. It analyzes the inherent visual cues of 3D relationships and enhances the perceptual accuracy of result images. The visualization is perceived by human's visual system, enhancements relying on perceptual theories can be a new way in creating informative results for multimodality data sets.
Enhancing Salient Features In Volumetric Data Using Illumination And Transfer Functions
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Author : Daniel Jönsson
language : en
Publisher: Linköping University Electronic Press
Release Date : 2016-10-04
Enhancing Salient Features In Volumetric Data Using Illumination And Transfer Functions written by Daniel Jönsson and has been published by Linköping University Electronic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-10-04 with categories.
The visualization of volume data is a fundamental component in the medical domain. Volume data is used in the clinical work-flow to diagnose patients and is therefore of uttermost importance. The amount of data is rapidly increasing as sensors, such as computed tomography scanners, become capable of measuring more details and gathering more data over time. Unfortunately, the increasing amount of data makes it computationally challenging to interactively apply high quality methods to increase shape and depth perception. Furthermore, methods for exploring volume data has mostly been designed for experts, which prohibits novice users from exploring volume data. This thesis aims to address these challenges by introducing efficient methods for enhancing salient features through high quality illumination as well as methods for intuitive volume data exploration. Humans are interpreting the world around them by observing how light interacts with objects. Shadows enable us to better determine distances while shifts in color enable us to better distinguish objects and identify their shape. These concepts are also applicable to computer generated content. The perception in volume data visualization can therefore be improved by simulating real-world light interaction. This thesis presents efficient methods that are capable of interactively simulating realistic light propagation in volume data. In particular, this work shows how a multi-resolution grid can be used to encode the attenuation of light from all directions using spherical harmonics and thereby enable advanced interactive dynamic light configurations. Two methods are also presented that allow photon mapping calculations to be focused on visually changing areas.The results demonstrate that photon mapping can be used in interactive volume visualization for both static and time-varying volume data. Efficient and intuitive exploration of volume data requires methods that are easy to use and reflect the objects that were measured. A value that has been collected by a sensor commonly represents the material existing within a small neighborhood around a location. Recreating the original materials is difficult since the value represents a mixture of them. This is referred to as the partial-volume problem. A method is presented that derives knowledge from the user in order to reconstruct the original materials in a way which is more in line with what the user would expect. Sharp boundaries are visualized where the certainty is high while uncertain areas are visualized with fuzzy boundaries. The volume exploration process of mapping data values to optical properties through the transfer function has traditionally been complex and performed by expert users. A study at a science center showed that visitors favor the presented dynamic gallery method compared to the most commonly used transfer function editor.
Information Theory Tools For Visualization
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Author : Min Chen
language : en
Publisher: CRC Press
Release Date : 2016-09-19
Information Theory Tools For Visualization written by Min Chen and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-09-19 with Computers categories.
This book explores Information theory (IT) tools, which have become state of the art to solve and understand better many of the problems in visualization. This book covers all relevant literature up to date. It is the first book solely devoted to this subject, written by leading experts in the field.
Computational Science Iccs 2002
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Author : Peter M.A. Sloot
language : en
Publisher: Springer
Release Date : 2003-08-01
Computational Science Iccs 2002 written by Peter M.A. Sloot and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-08-01 with Computers categories.
Computational Science is the scienti?c discipline that aims at the development and understanding of new computational methods and techniques to model and simulate complex systems. The area of application includes natural systems – such as biology, envir- mental and geo-sciences, physics, and chemistry – and synthetic systems such as electronics and ?nancial and economic systems. The discipline is a bridge b- ween ‘classical’ computer science – logic, complexity, architecture, algorithms – mathematics, and the use of computers in the aforementioned areas. The relevance for society stems from the numerous challenges that exist in the various science and engineering disciplines, which can be tackled by advances made in this ?eld. For instance new models and methods to study environmental issues like the quality of air, water, and soil, and weather and climate predictions through simulations, as well as the simulation-supported development of cars, airplanes, and medical and transport systems etc. Paraphrasing R. Kenway (R.D. Kenway, Contemporary Physics. 1994): ‘There is an important message to scientists, politicians, and industrialists: in the future science, the best industrial design and manufacture, the greatest medical progress, and the most accurate environmental monitoring and forecasting will be done by countries that most rapidly exploit the full potential ofcomputational science’. Nowadays we have access to high-end computer architectures and a large range of computing environments, mainly as a consequence of the enormous s- mulus from the various international programs on advanced computing, e.g.
Visual Computing For Medicine
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Author : Bernhard Preim
language : en
Publisher: Newnes
Release Date : 2013-11-07
Visual Computing For Medicine written by Bernhard Preim and has been published by Newnes this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-07 with Computers categories.
Visual Computing for Medicine, Second Edition, offers cutting-edge visualization techniques and their applications in medical diagnosis, education, and treatment. The book includes algorithms, applications, and ideas on achieving reliability of results and clinical evaluation of the techniques covered. Preim and Botha illustrate visualization techniques from research, but also cover the information required to solve practical clinical problems. They base the book on several years of combined teaching and research experience. This new edition includes six new chapters on treatment planning, guidance and training; an updated appendix on software support for visual computing for medicine; and a new global structure that better classifies and explains the major lines of work in the field. Complete guide to visual computing in medicine, fully revamped and updated with new developments in the field Illustrated in full color Includes a companion website offering additional content for professors, source code, algorithms, tutorials, videos, exercises, lessons, and more
Graphics Interface 2014
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Author : Paul G. Kry
language : en
Publisher: CRC Press
Release Date : 2020-11-25
Graphics Interface 2014 written by Paul G. Kry and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-11-25 with Computers categories.
This book is the proceedings of the 40th annual Graphics Interface conference-the oldest continuously scheduled conference in the field. The book includes high-quality papers on recent advances in interactive systems, human computer interaction, and graphics from around the world. It covers the following topics: shading and rendering, geometric modeling and meshing, image-based rendering, image synthesis and realism, computer animation, real-time rendering, non-photorealistic rendering, interaction techniques, human interface devices, augmented reality, data and information visualization, mobile computing, haptic and tangible interfaces, and perception.
Information Visualization
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Author : Colin Ware
language : en
Publisher: Elsevier
Release Date : 2013
Information Visualization written by Colin Ware and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Business & Economics categories.
"This is a book about what the science of perception can tell us about visualization. There is a gold mine of information about how we see to be found in more than a century of work by vision researchers. The purpose of this book is to extract from that large body of research literature those design principles that apply to displaying information effectively"--
Advances In Visual Computing
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Author : George Bebis
language : en
Publisher: Springer Science & Business Media
Release Date : 2009-11-09
Advances In Visual Computing written by George Bebis and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-11-09 with Computers categories.
The two volume set LNCS 5875 and LNCS 5876 constitutes the refereed proceedings of the 5th International Symposium on Visual Computing, ISVC 2009, held in Las Vegas, NV, USA, in November/December 2009. The 97 revised full papers and 63 poster papers presented together with 40 full and 15 poster papers of 7 special tracks were carefully reviewed and selected from more than 320 submissions. The papers are organized in topical sections on computer graphics; visualization; feature extraction and matching; medical imaging; motion; virtual reality; face processing; reconstruction; detection and tracking; applications; and video analysis and event recognition. The 7 additional special tracks address issues such as object recognition; visual computing for robotics; computational bioimaging; 3D mapping, modeling and surface reconstruction; deformable models: theory and applications; visualization enhanced data analysis for health applications; and optimization for vision, graphics and medical imaging: theory and applications.
Proceedings Of The Ieee Conference On Visualization
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Author :
language : en
Publisher:
Release Date : 1991
Proceedings Of The Ieee Conference On Visualization written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Computer graphics categories.