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检索条件"机构=Image Processing and Computer Graphics Department"

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RegistrationShop: An interactive 3d medical volume registration system

RegistrationShop: An interactive 3d medical volume registrat...

引用

2014 Eurographics Workshop on Visual Computing for Biology and Medicine, VCBM 2014

作者： Smit, Noeska N. Haneveld, Berend Klein Staring, Marius Eisemann, Elmar Botha, Charl P. Vilanova, Anna Computer Graphics and Visualization group Intelligent Systems TU Delft Netherlands Division of Image Processing Department of Radiology LUMC Netherlands Vxlabs South Africa

ISBN: (纸本)9783905674620

In medical imaging, registration is used to combine images containing information from different modalities or to track treatment effects over time in individual patients. Most registration software packages do not provide an easy-to-use interface that facilitates the use of registration. 2D visualization techniques are often used for visualizing 3D datasets. RegistrationShop was developed to improve and ease the process of volume registration using 3D visualizations and intuitive interactive tools. It supports several basic visualizations of 3D volumetric data. Interactive rigid and non-rigid transformation tools can be used to manipulate the volumes and immediate visual feedback for all rigid transformation tools allows the user to examine the current result in real-time. In this context, we introduce 3D comparative visualization techniques, as well as a way of placing landmarks in 3D volumes. Finally, we evaluated our approach with domain experts, who underlined the potential and usefulness of RegistrationShop. © Eurographics Workshop on Visual Computing for Biology and Medicine, VCBM 2014. All rights reserved.

关键词： Medical imaging

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Medical object 3d visualization method based on the Bézier triangles

Medical object 3d visualization method based on the Bézier ...

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IADIS International Conference computer graphics, Visualization, computer Vision and image processing 2012, CGVCVIP 2012, Part of the IADIS Multi Conference on computer Science and Information Systems 2012, MCCSIS 2012

作者： Sisojeés, Aleksandrs Koéaloés, Mihails Glazs, Aleksandrs Riga Technical Uniéersity Department of Image Processing and Computer Graphics Meza street 1/3 Riga Latéia LV-1048 Latvia

ISBN: (纸本)9789728939748

This paper describes an approach that is aimed to solée seéeral medical image processing tasks - the object's surface 3D reconstruction and the following 3D éisualization. The proposed 3D éisualization method uses a Bézier triangle surface based model creation rather than polygon-based systems to significantly improée computational accuracy and the quality of generated 3D models. The proposed approach was tested on the medical images of a brain acquired by computer tomography and proéen to be applicable to different types of region of interest. The results can be used to proéide practical improéements to the reliability of medical diagnostics. © 2012 IADIS.

关键词： Diagnosis

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A Study of Transfer Function Generation for Time-Varying Volume Data 2

A Study of Transfer Function Generation for Time-Varying Vol...

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2nd IEEE TCVG / Eurographics International Workshop on Volume graphics, VG 2001

作者： Jankun-Kelly, T.J. Ma, Kwan-Liu Visualization And Graphics Research Group Center For Image Processing And Integrated Computing University Of California Department Of Computer Science DavisCA95616 United States

ISBN: (纸本)321183737X

The proper usage and creation of transfer functions for time-varying data sets is an often ignored problem in volume visualization. Although methods and guidelines exist for time-invariant data, little formal study for the timevarying case has been performed. This paper examines this problem, and reports the study that we have conducted to determine how the dynamic behavior of time-varying data may be captured by a single or small set of transfer functions. The criteria which dictate when more than one transfer function is needed were also investigated. Four data sets with different temporal characteristics were used for our study. Results obtained using two different classes of methods are discussed, along with lessons learned. These methods, including a new multiresolution opacity map approach, can be used for semi-automatic generation of transfer functions to explore large-scale time-varying data sets. © VG 2001. All rights reserved.

关键词： Transfer functions

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Discrete tomography in medical imaging

Discrete tomography in medical imaging

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作者： Herman, Gabor T. Kuba, Attila Department of Computer Science Graduate Center City University of New York New York NY 10016 United States Department of Image Processing and Computer Graphics University of Szeged Szeged Hungary

Discrete tomography (DT) deals with the reconstruction of a function from its projections, when the function has a known discrete range. The knowledge of the discrete range, possibly together with some prior information, can significantly reduce the number of projections required for a high-quality reconstruction. The reconstruction methods used in DT applications are usually based on some formulation as an optimization problem. This paper presents methods and results of DT based on problems of angiography, emission tomography, and electron microscopy (EM). © 2003 IEEE.

关键词： computerized tomography

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Sampling step importance in hierarchical semantic segmentation of microscopic images

Sampling step importance in hierarchical semantic segmentati...

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15th International Conference on System Theory, Control and Computing, ICSTCC 2011

作者： Smochina, Cristian Manta, Vasile Kropatsch, Walter Department of Computer Science and Engineering Gheorghe Asachi Technical University of Iasi Romania Pattern Recognition and Image Processing Group Institute of Computer Graphics and Algorithms Vienna University of Technology Austria

ISBN: (纸本)9781457711732

The objective of semantic segmentation in microscopic images is to extract the cellular, nuclear or tissue components. This problem is challenging due to the large variations of these components features (size, shape, orientation or texture). In this paper we improve the technique presented in [17] used to identify the epithelial nuclei (crypt) against interstitial nuclei in microscopic images taken from colon tissues. In the proposed enhanced approach, the crypt inner boundary is detected using the closing morphological pyramid instead of morphological hierarchy. The outer crypt border is determined by the epithelial nuclei, overlapped by the maximal isoline of the inner boundary. The use of sampling in building the pyramid offers computational efficiency, reduces the amount of used memory, increase the robustness and preserve the quality results. An analysis of the two approaches is performed considering the number of pixels processed to create each level. Also the relation between the levels of the hierarchical structures is established. © 2011 Faculty of Auto Control.

关键词： Computational efficiency

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Visibly accurate model-based binary image compression scheme

Visibly accurate model-based binary image compression scheme

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2011 2nd IEEE International Conference on Signal and image processing Applications, ICSIPA 2011

作者： Alzahir, Saif Image Processing Graphics and Multimedia Lab Computer Science Department UNBC Prince George BC V2N 4Z9 Canada

ISBN: (纸本)9781457702419

In this paper we propose a model-based binary image compression scheme. In this scheme, we merge one-dimensional (1-D) blocks of black pixels of the input binary image with those in consecutive rows into larger blocks using mathematical models that preserve the quality of the image. This process reduces the number of vertices when the image is segmented into rectangles for compression. The top-left and the bottom-right vertices of each generated rectangle are then identified and the coordinates of which are efficiently encoded. The model for merging the blocks was obtained through extracting the data values involving the blocks of various widths and the subjective tolerance of an average viewer. The data values are then plotted on a Cartesian plane and approximated with linear, logarithmic, and polynomial functions. Simulation results show that the images after merging using the proposed model have less number of rectangles without any obvious image distortion and have higher compression ratio those rectangular partitioning methods in the literature. © 2011 IEEE.

关键词： Merging

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Growth simulation of human embryo brain 17

Growth simulation of human embryo brain

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17th Spring Conference on computer graphics, SCCG 2001

作者： Czanner, S. ɰurikovič, R. Inoue, H. Software Dept. Univ. of Aizu Aizu-Wakamatsu City Japan Department of Computer Graphics and Image Processing Faculty of Mathematics Physics and Computer Science Comenius University Bratislava Slovakia

ISBN: (纸本)0769512151

The growth of the brain of a human embryo changes over a long period of time in the body of the mother. So it is very difficult to observe and to understand that process. Therefore, embryologists have found realistic human organ models and animations to be necessary for their studies, but to create realistic human embryo brain models and to perform the animations requires an appropriate methodology. This paper presents a developing methodology based on the brain's functional representation and the convolutions of the surfaces. We employed this methodology to create a growth simulation of a human embryo's brain. The idea behind this technique is as follows. As a first step a 2D central skeleton is created from an artistic drawing and then a 3D skeleton is modeled by adding thickness information. In the next step, the skeletons representing the key-frame models are used to create an animation. At the end, the gap between the key-frame models is filled by suitable interpolation techniques and, finally, the animation is composed. © 2001 IEEE.

关键词： Blending

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Evaluation of point matching methods for wide-baseline stereo correspondence on mobile platforms

Evaluation of point matching methods for wide-baseline stere...

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International Symposium on image and Signal processing and Analysis

作者： Endre Juhász Attila Tanács Zoltan Kato Department of Image Processing and Computer Graphics University of Szeged Hungary

Wide-baseline stereo matching is a common problem of computer vision. By the explosion of smartphones equipped with camera modules, many classical computer vision solutions have been adapted to such platforms. Considering the widespread use of various networking options for mobile phones, one can consider a set of smart phones as an ad-hoc camera network, where each camera is equipped with a more and more powerful computing engine in addition to a limited bandwidth communication with other devices. Therefore the performance of classical vision algorithms in a collaborative mobile environment is of particular interest. In such a scenario we expect that the images are taken almost simultaneously but from different viewpoints, implying that the camera poses are significantly different but lighting conditions are the same. In this work, we provide quantitative comparison of the most important keypoint detectors and descriptors in the context of wide baseline stereo matching. We found that for resolution of 2 megapixels images the current mobile hardware is capable of providing results efficiently.

关键词： Cameras Detectors Mobile communication Smart phones Matrix decomposition Feature extraction Hardware

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Gesture-based computer mouse using Kinect sensor

Gesture-based computer mouse using Kinect sensor

引用

International Conference on Cognitive Infocommunications (CogInfoCom)

作者： Szilvia Szeghalmy Marianna Zichar Attila Fazekas Department of Computer Graphics and Image Processing University of Debrecen Debrecen

This paper introduces a vision-based gesture mouse system, which is roughly independent from the lighting conditions, because it only uses the depth data for hand sign recognition. A Kinect sensor was used to develop the system, but other depth sensing cameras are adequate as well, if their resolutions are similar or better than the resolution of Kinect sensor. Our aim was to find a comfortable, user-friendly solution, which can be used for a long time without getting tired. The implementation of the system was developed in C++, and two types of test were performed too. We investigated how fast the user can position with the cursor and click on objects and we also examined which controls of the graphical user interfaces (GUI) are easy to use and which ones are difficult to use with our gesture mouse. Our system is precise enough to use efficiently most of the elements of traditional GUI such as buttons, icons, scrollbars, etc. The accuracy achieved by advanced users is only slightly below as if they used the traditional mouse.

关键词： Mice Indexes computers Graphical user interfaces Thumb Conferences Accuracy

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Quantitative Analysis of Artificial Validation Sets for Fourier Domain CT Reconstruction 23

Quantitative Analysis of Artificial Validation Sets for Four...

引用

Proceedings of the 2023 7th International Conference on Advances in image processing

作者： Zoltan Domokos Laszlo G. Varga Department of Image Processing and Computer Graphics University of Szeged Hungary

ISBN: (纸本)9798400708275

In computed tomography and several related scientific domains, the Fourier slice theorem is a powerful mathematical tool to solve the problem of image reconstruction. Although this theorem is well understood in the continuous case, a detailed quantitative analysis of artifacts caused by discretization is rarely found in the computed tomographic literature. Assuming a practical Fourier Domain Reconstruction (FDR) algorithm, which performs resampling by interpolation or approximation in the frequency domain, artifacts have two main sources. One of these is a combination of truncation and aliasing, introduced by Discrete Fourier Transform (DFT), while the other is the numerical error of the function estimation algorithm that performs resampling. Here, we provide an algebraic method to quantitatively isolate distinct sources of error and construct a set of novel metrics that can be used in the numerical analysis of reconstruction methods.

关键词： computed tomography fourier domain reconstruction interpolation neural networks

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