检索结果-内蒙古大学图书馆

The Large Gap E-Plane Omori Circulator: First and Second Circulation Conditions

IET Microwaves, Antennas and Propagation 2025年第1期19卷

作者： Helszajn, Joseph Carignan, Louis-Philippe McKay, Mark Tsounis, Bill Wu, Ke Heriot-Watt University Edinburgh United Kingdom Digital Technologies Computer Vision and Graphics National Research Council Canada Montreal Canada Leonardo UK Ltd Edinburgh United Kingdom Apollo Microwaves Dorval Canada Polytechnique Montreal PolyGrames Research Center Montréal Canada

A characteristic of the E-plane circulator is that it displays two neighbouring solutions for the first and second circulation conditions. The so-called small gap E-plane circulator was dealt with in the literature. This paper is concerned with the large gap geometry. It outlines a simple eigenvalue subroutine for the design of either arrangement, and includes some experimental data in WR75 waveguide for the degree-one large gap geometry. Good agreement was found between numerical simulations and experiments. High peak power analysis showed a significant improvement for large gap E-plane geometry, in comparison to the small gap E-plane as well as the H-plane junction circulator. © 2025 The Author(s). IET Microwaves, Antennas & Propagation published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology.

关键词： Geometry

来源：评论

学校读者我要写书评

暂无评论

Intraoperative measurements in stapedotomy using 3D stereo imaging for optimal prosthesis length selection

引用

computers in Biology and Medicine 2025年 191卷 110233-110233页

作者： Wisotzky, Eric L. Lausch, Felix Kienle, Linus L. van Bonn-Ytrehus, Sara Hilsmann, Anna Eisert, Peter Schraven, Sebastian P. Mlynski, Robert Computer Vision & Graphics Vision and Imaging Technologies Fraunhofer Heinrich Hertz Institut HHI Berlin Germany Institute of Informatics Humboldt Universität zu Berlin Germany Klinik und Poliklinik für Hals-Nasen-Ohrenheilkunde Kopf- und Halschirurgie "Otto Körner" Universitätsmedizin Rostock Germany Department of Othorinolaryngology Head and Neck Surgery Interdisciplinary Skull Base Center Klinikum Fulda GAG University Medicine Marburg Campus Fulda Germany

The application of 3D stereoscopic imaging in surgery represents an innovative approach for anatomical measurements without the use of ionizing radiation or tools contacting the anatomy. Achieving precise intraoperative measurements is crucial in microsurgery, yet conventional methods often lack accuracy due to technical limitations in microscopic zoom lens systems. This study investigates 3D imaging within a digital microscope for stapedotomy, focusing on its accuracy and clinical applicability in selecting optimal prosthesis lengths. We present an optimized calibration scheme for stereoscopic zoom-focus systems across all focus settings, particularly at high magnification levels. A cohort of 23 patients underwent stapedotomy with stereo imaging for landmark annotation and prosthesis measurement. Our calibration method ensured sub-millimeter accuracy, achieving an average deviation of 0.2097 ± 0.1598 mm. The findings demonstrated a significant correlation between insertion depth and postoperative audiological outcomes. Audiological evaluations revealed a mean air-bone gap improvement of 19.1 dB [HL], validating the method's clinical efficacy. This technique offers a radiation-free, efficient alternative to conventional methods, integrating seamlessly into surgical workflows. The study highlights the potential of this imaging modality to enhance surgical precision and patient outcomes, setting the stage for future advancements in automated real-time measurements and broader clinical validation. © 2025 The Author(s)

关键词： Stereo image processing

来源：评论

学校读者我要写书评

暂无评论

Digital visual information processing: adding vision and graphics

Digital visual information processing: adding vision and gra...

引用

International Symposium on Image and Signal Processing and Analysis

作者： F.W. Leberl Institute for Computer Graphics and Vision Graz University of Technology Graz Austria

ISBN: (纸本)9539676924

Models of the real world are at least 3-dimensional and require the technologies of image processing and computer graphics. We see the processing of images, be they of the real world or of models in a computer, as one and the same basic technology, namely "digital visual information processing". This paper seeks to illustrate and justify this point-of-view by means of examples taken mostly from the work at the author's institute.

关键词： Information processing computer graphics Rendering (computer graphics) Pipelines computer vision Signal processing Image analysis Signal analysis Image sequence analysis Image texture analysis

来源：评论

学校读者我要写书评

暂无评论

Removing fences from sweep motion videos using global 3D reconstruction and fence-aware light field rendering

引用

Computational Visual Media 2019年第1期5卷 21-32页

作者： Chanya Lueangwattana Shohei Mori Hideo Saito Department of Science and Technology Keio University Institute of Computer Graphics and Vision Graz University of Technology

Diminishing the appearance of a fence in an image is a challenging research area due to the characteristics of fences(thinness, lack of texture, etc.) and the need for occluded background restoration. In this paper, we describe a fence removal method for an image sequence captured by a user making a sweep motion, in which occluded background is potentially observed. To make use of geometric and appearance information such as consecutive images, we use two well-known approaches: structure from motion and light field rendering. Results using real image sequences show that our method can stably segment fences and preserve background details for various fence and background combinations. A new video without the fence, with frame coherence, can be successfully provided.

关键词： video fence video repair diminished reality(DR) structure from motion(SfM) light field rendering(LFR)

来源：评论

学校读者我要写书评

暂无评论

Motion Estimation with Non-Local Total Variation Regularization

Motion Estimation with Non-Local Total Variation Regularizat...

引用

23rd IEEE Conference on computer vision and Pattern Recognition (CVPR)

作者： Werlberger, Manuel Pock, Thomas Bischof, Horst Institute for Computer Graphics and Vision Austria

ISBN: (纸本)9781424469840

State-of-the-art motion estimation algorithms suffer from three major problems: Poorly textured regions, occlusions and small scale image structures. Based on the Gestalt principles of grouping we propose to incorporate a low level image segmentation process in order to tackle these problems. Our new motion estimation algorithm is based on non-local total variation regularization which allows us to integrate the low level image segmentation process in a unified variational framework. Numerical results on the Middlebury optical flow benchmark data set demonstrate that we can cope with the aforementioned problems.

关键词： Motion estimation

来源：评论

学校读者我要写书评

暂无评论

View-Aware Image Object Compositing and Synthesis from Multiple Sources

引用

Journal of computer Science & Technology 2016年第3期31卷 463-478页

作者： Xiang Chen Wei-Wei Xu Sai-Kit Yeung Kun Zhou State Key Laboratory of Computer Aided Design and Computer Graphics Zhejiang University Hangzhou 310058 China Vision Graphics and Computational Design Group Singapore University of Technology and Design Singapore 487372 Singapore

Image compositing is widely used to combine visual elements from separate source images into a single image. Although recent image compositing techniques are capable of achieving smooth blending of the visual elements from different sources, most of them implicitly assume the source images are taken in the same viewpoint. In this paper, we present an approach to compositing novel image objects from multiple source images which have different viewpoints. Our key idea is to construct 3D proxies for meaningful components of the source image objects, and use these 3D component proxies to warp and seamlessly merge components together in the same viewpoint. To realize this idea, we introduce a coordinate- frame based single-view camera calibration algorithm to handle general types of image objects, a structure-aware cuboid optimization algorithm to get the cuboid proxies for image object components with correct structure relationship, and finally a 3D-proxy transformation guided image warping algorithm to stitch object components. We further describe a novel application based on this compositing approach to automatically synthesize a large number of image objects from a set of exemplars. Experimental results show that our compositing approach can be applied to a variety of image objects, such as chairs, cups, lamps, and robots, and the synthesis application can create novel image objects with significant shape and style variations from a small set of exemplars.

关键词： image cloning 3D proxy probabilistic modeling data-driven method

来源：评论

学校读者我要写书评

暂无评论

Gaussian Process Emulators for Few-Shot Segmentation in Cardiac MRI 15th

Gaussian Process Emulators for Few-Shot Segmentation in Ca...

引用

15th International Workshop on Statistical Atlases and Computational Models of the Heart, STACOM 2024, Held in Conjunction with MICCAI 2024

作者： Viti, Bruno Thaler, Franz Kapper, Kathrin Lisa Urschler, Martin Holler, Martin Karabelas, Elias Department of Mathematics and Scientific Computing University of Graz Graz Austria Institute for Medical Informatics Statistics and Documentation Medical University of Graz Graz Austria Institute of Computer Graphics and Vision Graz University of Technology Graz Austria Gottfried Schatz Research Center: Medical Physics and Biophysics Medical University of Graz Graz Austria BioTechMed-Graz Graz Austria

ISBN: (纸本)9783031877551

Segmentation of cardiac magnetic resonance images (MRI) is crucial for the analysis and assessment of cardiac function, helping to diagnose and treat various cardiovascular diseases. Most recent techniques rely on deep learning and usually require an extensive amount of labeled data. To overcome this problem, few-shot learning has the capability of reducing data dependency on labeled data. In this work, we introduce a new method that merges few-shot learning with a U-Net architecture and Gaussian Process Emulators (GPEs), enhancing data integration from a support set for improved performance. GPEs are trained to learn the relation between the support images and the corresponding masks in latent space, facilitating the segmentation of unseen query images given only a small labeled support set at inference. We test our model with the M&Ms-2 public dataset to assess its ability to segment the heart in cardiac magnetic resonance imaging from different orientations, and compare it with state-of-the-art unsupervised and few-shot methods. Our architecture shows higher DICE coefficients compared to these methods, especially in the more challenging setups where the size of the support set is considerably small. The code is available on GitLab (https://***/bruno_viti/gpe_4_cardiac_fss). © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Gaussian distribution

来源：评论

学校读者我要写书评

暂无评论

An Efficient Elitist Covariance Matrix Adaptation for Continuous Local Search in High Dimension

An Efficient Elitist Covariance Matrix Adaptation for Contin...

引用

IEEE Congress on Evolutionary Computation (IEEE CEC)

作者： Li, Zhenhua Deng, Jingda Gao, Weifeng Zhang, Qingfu Liu, Hai-Lin Institute of Computer Graphics and Vision Graz University of Technology

ISBN: (纸本)9781728121536

In this paper, we propose a computationally efficient variant of elitist covariance matrix evolution strategy for continuous local search in high dimensional space. It focuses on searching in a low-dimensional subspace expanded by a small number of promising search directions. This leads to the linear internal computational complexity of each iteration, which enables the algorithm to scale to high dimensional problems. We conduct comprehensive experiments to evaluate the parameter sensitivity and the algorithm's performance. The experimental results validate that the proposed algorithm reduces the running time by a factor of ten, and it can be easily scaled up to n > 1000 on a set of commonly used test functions.

关键词： Covariance matrices Matrix decomposition Adaptation models Search problems Optimization Convergence Computational modeling

来源：评论

学校读者我要写书评

暂无评论

FINDING STRUCTURE IN CO-OCCURRENCE MATRICES FOR TEXTURE ANALYSIS

COMPUTER GRAPHICS AND IMAGE PROCESSING

引用

computer graphics AND IMAGE PROCESSING 1980年第3期12卷 286-308页

作者： ZUCKER, SW TERZOPOULOS, D Computer Vision and Graphics Laboratory Department of Electrical Engineering McGill University Montreal Quebec Canada

Co-occurrence matrices are a popular representation for the texture in images. They contain a count of the number of times that a given feature (e.g., a given gray level) occurs in a particular spatial relation to another given feature. However, because of the large number of spatial relations that are possible within an image, heuristic or interactive techniques have usually been employed to select the relation to use for each problem. In this paper we present a statistical approach to finding those spatial (or other) relations that best capture the structure of textures when the co-occurrence matrix representation is used. These matrices should thus be well suited for discriminations that are structurally based.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Urban data management - a modern approach

引用

computers, Environment and Urban Systems 1997年第2期21卷 147-158页

作者： Gruber, M. Wilmersdorf, E. Inst Computer Graphics + Vision Technical Univ Graz Muenzgrabenstrasse 11 Graz A-8010 Austria

The urban data management of the outgoing 20th century shows strong emphasis in creating three-dimensional descriptions of cities, developing methods to maintain and up-date these data, and in exploiting the Web for broad distribution and presentation. The so-called CyberCity not only shows data in three dimensions but also presents photorealistic surface description, exploiting phototexture from aerial and terrestrial images. The benefit of this high level quality is of broad appeal, which makes the CyberCity a tool for various applications, such as decision making, mission planning, simulation, training, path finding and many others. Remote and local access to the data, fast interaction and electronic links to other urban information systems turns this into a concept of a hypermedia database system, which is the unavoidable next step in improving the data for the management of our growing cities.

关键词： Database systems

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：