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BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY 2023年第9期104卷 S322-S365页

作者： Clem, Kyle R. Raphael, Marilyn N. School of Geography Environment and Earth Sciences Victoria University of Wellington Wellington New Zealand Scripps Institution of Oceanography University of California San Diego La Jolla California Department of Atmospheric and Oceanic Sciences University of Colorado Boulder Boulder Colorado Earth Science Observation Center Cooperative Institute for Research in Environmental Sciences (ESOC/CIRES) University of Colorado Boulder Boulder Colorado Argentine Naval Hydrographic Service Buenos Aires Argentina Department of Earth and Environmental Science Temple University Philadelphia Pennsylvania Department of Meteorology University of Valparaíso Valparaíso Chile Center for Climate and Resilience Research (CR)2 Santiago Chile British Antarctic Survey Cambridge United Kingdom Science Systems and Applications Inc. Lanham Maryland NASA Goddard Space Flight Center Greenbelt Maryland Royal Netherlands Meteorological Institute (KNMI) DeBilt The Netherlands Department of Marine Sciences University of Gothenburg Gothenburg Sweden Department of Geography Ohio University Athens Ohio NASA Jet Propulsion Laboratory Pasadena California NOAA/OAR Earth System Research Laboratory Global Monitoring Division Boulder Colorado University of Colorado Boulder Boulder Colorado National Oceanography Centre Southampton United Kingdom. Antarctic Meteorological Research and Data Center Space Science and Engineering Center University of Wisconsin-Madison Madison Wisconsin Department of Physical Sciences School of Arts and Sciences Madison Area Technical College Madison Wisconsin Australian Bureau of Meteorology and Institute for Marine and Antarctic Studies (IMAS) University of Tasmania Hobart Australia Earth Science and Observation Center CIRES University of Colorado Boulder Colorado University of St. Andrews St Andrews United Kingdom Princeton University Princeton New Jersey Australian Antarctic Division Australian Antarctic Program Partnership (AAPP) and Australian Centre fo

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A brain computer interface for communication using real-time fMRI

A brain computer interface for communication using real-time...

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2010 20th International Conference on Pattern Recognition, ICPR 2010

作者： Eklund, Anders Andersson, Mats Ohlsson, Henrik Ynnerman, Anders Knutsson, Hans Division of Medical Informatics Department of Biomedical Engineering Linköping University Sweden Division of Automatic Control Department of Electrical Engineering Linköping University Sweden Division for Visual Information Technology and Applications Department of Science and Technology Linköping University Sweden Linköping University Sweden

ISBN: (纸本)9780769541099

We present the first step towards a brain computer interface (BCI) for communication using real-time functional magnetic resonance imaging (fMRI). The subject in the MR scanner sees a virtual keyboard and steers a cursor to select different letters that can be combined to create words. The cursor is moved to the left by activating the left hand, to the right by activating the right hand, down by activating the left toes and up by activating the right toes. To select a letter, the subject simply rests for a number of seconds. We can thus communicate with the subject in the scanner by for example showing questions that the subject can answer. Similar BCI for communication have been made with electroencephalography (EEG). In these implementations the subject for example focuses on a letter while different rows and columns of the virtual keyboard are flashing. The system then tries to detect if the correct letter is flashing or not. In our setup we instead classify the brain activity. Our system is not limited to a communication interface, but can be used for any interface where five degrees of freedom is necessary. © 2010 IEEE.

关键词： Brain computer interface

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Multi-Dimensional Transfer Function Design Using Sorted Histograms 5

Multi-Dimensional Transfer Function Design Using Sorted Hist...

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5th Eurographics / IEEE VGTC International Workshop on Volume Graphics, VG@SIGGRAPH 2006

作者： Lundström, Claes Ljung, Patric Ynnerman, Anders Linköping University Sectra-Imtec AB Sweden Division for Visual Information Technology and Applications Linköping University Sweden

ISBN: (纸本)390567341X

Multi-dimensional Transfer Functions (MDTFs) are increasingly used in volume rendering to produce high quality visualizations of complex data sets. A major factor limiting the use of MDTFs is that the available design tools have not been simple enough to reach wide usage outside of the research context, for instance in clinical medical imaging. In this paper we address this problem by defining an MDTF design concept based on improved histogram display and interaction in an exploratory process. To this end we propose sorted histograms, 2D histograms that retain the intuitive appearance of a traditional 1D histogram while conveying a second attribute. We deploy the histograms in medical visualizations using data attributes capturing domain knowledge e.g. in terms of homogeneity and typical surrounding of tissues. The resulting renderings demonstrate that the proposed concept supports a vast number of visualization possibilities based on multi-dimensional attribute data. © The Eurographics Association 2006.

关键词： visualization

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The α-histogram: Using Spatial Coherence to Enhance Histograms and Transfer Function Design

The α-histogram: Using Spatial Coherence to Enhance Histogr...

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8th Joint Eurographics/IEEE VGTC Symposium on visualization, EuroVis 2006

作者： Lundström, Claes Ynnerman, Anders Ljung, Patric Persson, Anders Knutsson, Hans Linköping University Sectra-Imtec AB Sweden Division for Visual Information Technology and Applications Linköping University Sweden Linköping University Sweden Medical Informatics Group Linköping University Sweden

ISBN: (纸本)3905673312

The high complexity of Transfer Function (TF) design is a major obstacle to widespread routine use of Direct Volume Rendering, particularly in the case of medical imaging. Both manual and automatic TF design schemes would benefit greatly from a fast and simple method for detection of tissue value ranges. To this end, we introduce the α-histogram, an enhancement that amplifies ranges corresponding to spatially coherent materials. The properties of the α-histogram have been explored for synthetic data sets and then successfully used to detect vessels in 20 Magnetic Resonance angiographies, proving the potential of this approach as a fast and simple technique for histogram enhancement in general and for TF construction in particular. © The Eurographics Association 2006.

关键词： Transfer functions

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