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IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： Angel Rodríguez-Vázquez Hamada Alshaer Bayan Sharif Amr Fahim Eman El Mandouh Ashraf Salem Fadi A. Aloul Hoda S. Abdel-Aty John F. Dodge Baker Mohammad Hisham Mohamed IMSE-CNM Universidad de Sevilla/CSIC AnaFocus Ltd Sevilla Spain Etisalat BT Innovation Center (EBTIC) Khalifa University Abu Dhabi UAE Electrical and Computer Engineering Dean of the College of Engineering at Khalifa Abu Dhabi UAE Semtech Corporation Irvine CA Mentor Graphics Cairo Egypt Department of Computer Science & Engineering American University in Sharjah U.A.E. Oakland University Rochester MI USA Khalifa University of Science Technology & Research (KUSTAR) UAE Rensselaer Polytechnic Institute Troy NY USA

CMOS imagers are complex systems whose design requires quite different pieces of expertise, namely: pixels, analog signal processing, pixel readout and analog-to-digital conversion, digital signal processing, output drivers, etc. Confronting the design of new imagers require hence the concourse of multidisciplinary teams. However, because correct operation calls for the close interconnection among the different parts, global knowledge is mandatory for successful design. This is particularly pertinent for the newer generations of smart imagers required for high-end applications and/or requiring ultra-high image capture, on-chip image correction, scene interpretation, high dynamic range capture, etc. All these features demand architectural and circuital innovations and pose significant challenges to designers. Also, the increased interest on sensors capable of capturing 3-D scenes raise new challenges at circuit level related to the necessity to interface pixels different from those employed for 2-D capture, on the one hand, and to extract and convert to digital domain time information, on the other hand. This tutorial addresses the design of smart CMOS imagers by following a comprehensive and complete top-down approach where each subsystem is contemplated and described as a part of a whole. Starting the formulation of the performance metrics used to specify and characterize imagers, the tutorial explains how the subsystem behavior and non-idealities impact on the global imager metrics, thereby setting the basis to specify the subsystems for given global image sensor specs. Such methodology is illustrated in the tutorial via a dedicated, MATLAB-based modeling tool which will be employed to allow the attendees gaining insight on the impact of non-ideal sub-systems behaviors. The tutorial overviews the state-of-the-art regarding: pixels; analog signal processing and read-out circuitry; data conversion circuitry, covering both amplitude data converters (required for 2-D

关键词： Tutorials Sensors Wireless sensor networks Energy harvesting Abstracts Educational institutions Cognitive radio

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Depth coded shape from focus

Depth coded shape from focus

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IEEE International Conference on Computational Photography (ICCP)

作者： Martin Lenz David Ferstl Matthias Rüther Horst Bischof Institute for Computer Graphics and Vision Graz University of Technology Graz Austria

We present a novel shape from focus method for high- speed shape reconstruction in optical microscopy. While the traditional shape from focus approach heavily depends on presence of surface texture, and requires a considerable amount of measurement time, our method is able to perform reconstruction from only two images. Our method relies the rapid projection of a binary pattern sequence, while object is continuously moved through the camera focus range and a single image is continuously exposed. Deconvolution of the integral image allows a direct decoding of binary pattern and its associated depth. Experiments a synthetic dataset and on real scenes show that a depth map can be reconstructed at only 3% of memory costs and fraction of the computational effort compared with traditional shape from focus.

关键词： Cameras Shape Three dimensional displays Microscopy Image resolution Accuracy Kernel

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A SVDD Method Based on Maximum Distance between Two Centers of Spheres

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电子学报(英文版) 2012年第1期21卷 107-111页

作者： FANG Jinglong WANG Wanliang WANG Xingqi LONG Zhe LIANG Dongsheng ZHOU Qili School of Computer Science and Technology Zhejiang University of Technology Hangzhou 310023 China Institute of Graphics and Image Hangzhou Dianzi University Hangzhou 310018 China

On the base of the method of Support vector data description (SVDD), this paper proposes a SVDD method based on maximum distance between two centers of spheres. It applies two hyperspheres to separate two kinds of training instance and maximize distance between two centers of hyperspheres at the same time. Experimental results show that the method is effective, especially for unbalance problem, our method can get better results than all other methods.

关键词：最大距离球体数据描述超球面最大化不平衡时间

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Biopsy planner - Visual analysis for needle pathway planning in deep seated brain tumor biopsy

Biopsy planner - Visual analysis for needle pathway planning...

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14th Eurographics Conference on Visualization 2012, EuroVis 2012

作者： Herghelegiu, P.C. Manta, V. Perin, R. Bruckner, S. Gröller, E. Gheorghe Asachi Technical University of Iasi Romania Clinical Emergency Hospital Bagdasar-Arseni Bucharest Romania Institute of Computer Graphics and Algorithms Vienna University of Technology Austria

Biopsies involve taking samples from living tissue using a biopsy needle. In current clinical practice they are a first mandatory step before any further medical actions are planned. Performing a biopsy on a deep seated brain tumor requires considerable time for establishing and validating the desired biopsy needle pathway to avoid damage. In this paper, we present a system for the visualization, analysis, and validation of biopsy needle pathways. Our system uses a multi-level approach for identifying stable needle placements which minimize the risk of hitting blood vessels. This is one of the major dangers in this type of intervention. Our approach helps in identifying and visualizing the point on the pathway that is closest to a surrounding blood vessel, requiring a closer inspection by the neurosurgeon. An evaluation by medical experts is performed to demonstrate the utility of our system. © 2012 The Author(s).

关键词： Biopsy

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Polyphase components of an image as video frames: A way to code still images using H.264

Polyphase components of an image as video frames: A way to c...

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Picture Coding Symposium, PCS

作者： Marek Parfieniuk Department of Digital Media and Computer Graphics Bialystok University of Technology Bialystok Poland

This paper shows that the principles of video coding that are related to removing temporal redundancy by means of motion estimation and compensation can be successfully used to compress still images. If all polyphase components of an image are identified with correlated video frames, only one of them needs to be intra-coded, as the rest can be encoded using mainly bidirectional prediction. Using the H.264 reference software, it has been experimentally verified that the approach offers compression comparable to intra-coding the whole image as a single video frame, the common way of applying the H.264 standard to still pictures. As the H.264 encoder is not optimized for processing polyphase components, the results suggest that, based on the presented idea, it is possible to develop a new image codec that could compete with the state-of-art algorithms.

关键词： Image coding PSNR Transform coding Standards Encoding Bit rate Video sequences

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Variable Neighborhood Search for Solving the Balanced Location Problem

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Electronic Notes in Discrete Mathematics 2012年 39卷 21-28页

作者： Kratica, Jozef Leitner, Markus Ljubić, Ivana Mathematical Institute Serbian Academy of Sciences and Arts 11 000 Belgrade Kneza Mihaila 36/III Serbia Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Department of Statistics and Operations Research University of Vienna Austria

In this paper we propose a general variable neighborhood search approach for the balanced location problem. Next to large shaking neighborhoods, the embedded variable neighborhood descent utilizes three neighborhood structures that focus on different solution aspects. By a computational study, we show that this VNS outperforms existing methods with respect to average solution quality and stability. © 2012 Elsevier B.V.

关键词： Balanced allocation of clients Discrete location Variable neighborhood search

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Volume visualization in the clinical practice

Volume visualization in the clinical practice

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6th International Workshop on Augmented Environments for computer-Assisted Interventions, AE-CAI 2011, Held in Conjunction with the Medical Image Computing and computer-Assisted Interventions, MICCAI 2011

作者： Kainz, Bernhard Portugaller, Rupert H. Seider, Daniel Moche, Michael Stiegler, Philipp Schmalstieg, Dieter Institute for Computer Graphics and Vision Graz University of Technology Austria Department of Interventional Radiology Division of Transplantation Surgery Medical University Graz Austria Department of Interventional Radiology University Hospital Leipzig Germany

ISBN: (纸本)9783642326295

Volumetric data is common in medicine, geology and engineering, but the O(n 3) complexity in data and algorithms has prevented the widespread use of volume graphics. Recently, 3D image processing and visualization algorithms have been parallelized and ported to graphics processing units. Today, medical diagnostics highly depends on volumetric imaging methods that must be visualized in real-time. However, daily clinical practice shows that physicians still prefer simple 2D multi-planar reconstructions over 3D visualizations for intervention planning. Therefore, a very basic question in this context is, if real-time 3D image synthesis is necessary at all. This paper makes four main observations in a clinical context, which are evaluated with 24 independent physicians from three different European hospitals. © 2012 Springer-Verlag.

关键词： Visualization

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DENSE APPEARANCE MODELING AND EFFICIENT LEARNING OF CAMERA TRANSITIONS FOR PERSON RE-IDENTIFICATION

DENSE APPEARANCE MODELING AND EFFICIENT LEARNING OF CAMERA T...

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IEEE International Conference on Image Processing

作者： Martin Hirzer Csaba Beleznai Martin Kostinger Peter M. Roth Horst Bischof Institute for Computer Graphics and Vision Graz University of Technology Austria Austrian Institute of Technology GmbH Austria

One central task in many visual surveillance scenarios is person re-identification, i.e., recognizing an individual person across a network of spatially disjoint cameras. Most successful recognition approaches are either based on direct modeling of the human appearance or on machine learning. In this work, we aim at taking advantage of both directions of research. On the one hand side, we compute a descriptive appearance representation encoding the vertical color structure of pedestrians. To improve the classification results, we additionally estimate the transition between two cameras using a pair-wisely estimated metric. In particular, we introduce 4D spatial color histograms and adopt Large Margin Nearest Neighbor (LMNN) metric learning. The approach is demonstrated for two publicly available datasets, showing competitive results, however, on lower computational costs.

关键词： Measurement Cameras Image color analysis Visualization Histograms Probes Training

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The effect of emotional colour on creating realistic expression of avatar

The effect of emotional colour on creating realistic express...

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11th ACM SIGGRAPH International Conference on Virtual-Reality Continuum and Its Applications in Industry, VRCAI 2012

作者： Alkawaz, Mohammed Hazim Basori, Ahmad Hoirul Faculty of Computer Science and Information Systems Universiti Teknologi Malaysia Malaysia Department of Graphics and Multimedia Faculty of Computer Science and Information Systems Universiti Teknologi Malaysia Johor Malaysia Department of Informatics Faculty of Information Technology Institut Teknologi Sepuluh Nopember Surabaya Indonesia

ISBN: (纸本)9781450318259

The research on facial animation has grown very fast and become more realistic in term of 3D facial data since the laser scan and advance 3D tools can support creating complex facial model. However, that approaches still lacking in term of facial expression based on emotional condition. Facial skin color is one parameter that is contributing on augmenting the realism of facial expression, because it's closely related to the emotion which happens inside the human. This paper provides a new technique for facial animation to change the colour of facial skin based on linear interpolation. © 2012 ACM.

关键词： Color

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Automating transfer function design with valley cell-based clustering of 2D density plots

Automating transfer function design with valley cell-based c...

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14th Eurographics Conference on Visualization 2012, EuroVis 2012

作者： Wang, Yunhai Zhang, Jian Lehmann, Dirk J. Theisel, Holger Chi, Xuebin Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences China Computer Network Information Center Chinese Academy of Sciences China Department of Simulation and Graphics University of Magdeburg Germany

Two-dimensional transfer functions are an effective and well-accepted tool in volume classification. The design of them mostly depends on the user's experience and thus remains a challenge. Therefore, we present an approach in this paper to automate the transfer function design based on 2D density plots. By exploiting their smoothness, we adopted the Morse theory to automatically decompose the feature space into a set of valley cells. We design a simplification process based on cell separability to eliminate cells which are mainly caused by noise in the original volume data. Boundary persistence is first introduced to measure the separability between adjacent cells and to suitably merge them. Afterward, a reasonable classification result is achieved where each cell represents a potential feature in the volume data. This classification procedure is automatic and facilitates an arbitrary number and shape of features in the feature space. The opacity of each feature is determined by its persistence and size. To further incorporate the user's prior knowledge, a hierarchical feature representation is created by successive merging of the cells. With this representation, the user is allowed to merge or split features of interest and set opacity and color freely. Experiments on various volumetric data sets demonstrate the effectiveness and usefulness of our approach in transfer function generation. © 2012 The Author(s).

关键词： Cells

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