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IEEE Canadian Conference on Electrical and computer Engineering

作者： Saif alZahir Faramarz Kashanchi Image Processing and Graphics Lab Computer Science Department UNBC

ISBN: (纸本)9781479900312

Measuring image quality is an interesting and challenging area of research. In this paper we investigate the performance of the statistical functions called copula as image quality measures. These functions are popular for applications where data distributions are unknown. This property motivated some researchers to using these copulas in image processing in general and in detecting image changes and image registration in particular. In this research, we use the Gaussian copula to calculate the mutual information, which is the measure of the association of the reference and the distorted or tampered with images. To test the performance of the proposed method, we implemented our method on LIVE image database and compared our results with three popular image quality measures namely Visual Information Fidelity (VIF), Structural Similarity (SSIM), and Universal Quality Measure (UQI). The results show that our quality measure, obtained similar results to the three methods in 99% of the time, hence the proposed method can be considered as an efficient image quality index.

关键词： Image quality measure VIF SSIM UQI Gaussian copula

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3D Semantic Parameterization for Human Shape Modeling: Application to 3D Animation

3D Semantic Parameterization for Human Shape Modeling: Appli...

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International Conference on 3D Imaging, Modeling, Processing, Visualization and Transmission (3DIMPVT)

作者： Christian Rupprecht Olivier Pauly Christian Theobalt Slobodan Ilic Department of Computer Science CAMP Technische Universität München Germany Technische Universitat Munchen Munchen Bayern DE Graphics Vision & Video Max Planck Institute Germany

Statistical human body models, like SCAPE, capture static 3D human body shapes and poses and are applied to many computer Vision problems. Defined in a statistical context, their parameters do not explicitly capture semantics of the human body shapes such as height, weight, limb length, etc. Having a set of semantic parameters would allow users and automated algorithms to sample the space of possible body shape variations in a more intuitive way. Therefore, in this paper we propose a method for re-parameterization of statistical human body models such that shapes are controlled by a small set of intuitive semantic parameters. These parameters are learned directly from the available statistical human body model. In order to apply any arbitrary animation to our human body shape model we perform retargeting. From any set of 3D scans, a semantic parametrized model can be generated and animated with the presented methods using any animation data. We quantitatively show that our semantic parameterization is more reliable than standard semantic parameterizations, and show a number of animations retargeted to our semantic body shape model.

关键词： Semantics Shape Three-dimensional displays Animation Biological system modeling Bones

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics): Preface

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2013年 7831 LNCS卷 V-VI页

作者： Krawiec, Krzysztof Moraglio, Alberto Hu, Ting Etaner-Uyar, A. Şima Hu, Bin Poznan University of Technology Institute of Computing Science Piotrowo 2 60-965 Poznań Poland University of Birmingham School of Computer Science Edgbaston Birmingham B15 2TT United Kingdom Dartmouth College Geisel School of Medicine Hanover NH 03755 United States Istanbul Technical University Department of Computer Engineering Masla 34469 Istanbul Turkey Vienna University of Technology Institute of Computer Graphics and Algorithms 1040 Vienna Austria

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SphereAvatar: A situated display to represent a remote collaborator 12

SphereAvatar: A situated display to represent a remote colla...

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30th ACM Conference on Human Factors in Computing Systems, CHI 2012

作者： Oyekoya, Oyewole Steptoe, William Steed, Anthony Virtual Environments and Computer Graphics Department of Computer Science University College London United Kingdom

ISBN: (纸本)9781450310154

An emerging form of telecollaboration utilizes situated or mobile displays at a physical destination to virtually represent remote visitors. An example is a personal telepresence robot, which acts as a physical proxy for a remote visitor, and uses cameras and microphones to capture its surroundings, which are transmitted back to the visitor. We propose the use of spherical displays to represent telepresent visitors at a destination. We suggest that the use of such 360° displays in a telepresence system has two key advantages: it is possible to understand the identity of the visitor from any viewpoint;and with suitable graphical representation, it is possible to tell where the visitor is looking from any viewpoint. In this paper, we investigate how to optimally represent a visitor as an avatar on a spherical display by evaluating how varying representations are able to accurately convey head gaze. Copyright 2012 ACM.

关键词： Mixed reality

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A virtual touchscreen with depth recognition

A virtual touchscreen with depth recognition

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13th Australasian User Interface Conference, AUIC 2012

作者： Hartmann, Gabriel Wünsche, Burkhard C. Graphics Group Department of Computer Science University of Auckland New Zealand

ISBN: (纸本)9781921770074

While touch interfaces have become more popular, they are still mostly conned to mobile platforms such as smart phones and notebooks. Mouse interfaces still dominate desktop platforms due to their portability, ergonomic design and large number of possible interactions. In this paper we present a prototype for a new interface based on cheap consumer-level hardware, which combines advantages of the mouse and touch interface, but additionally allows the detection of 3D depth values. This is achieved by using a web cam and point light source and detecting hand and shadow gestures in order to compute 3D nger tip positions. Our evaluation shows that the concept is feasible and more powerful interactions than with traditional interfaces can be achieved. Limitations include a reduced input precision, insucient stability of the utilised computer vision algorithms, and the requirement of a stable lighting environment. © 2012, Australian computer Society, Inc.

关键词： Stereo vision

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A robust color image watermarking scheme

A robust color image watermarking scheme

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IASTED International Conference on Visualization, Imaging and Image Processing, VIIP 2012

作者： Wahedul Islam, Md. Alzahir, Saif Computer Science Department Image Processing and Graphics Lab UNBC BC Canada

ISBN: (纸本)9780889869264

In this paper, we present an image watermarking scheme based on discrete wavelet transform and singular value decomposition (SVD) for color Images. This scheme embeds the watermark into the luminance (Y) channel of YC bCR color space of the host image. The luminance image is decomposed up to four DWT levels. SVD is applied on the HL1-4 and LH1-4sub-bands of each level and pseudo random number (PRN) sequence is added to the singular values of their coefficients to produce what we call modified singular values. To obtain the modified HL and LH coefficients, we take the inverse of the SVD of the modified SVs. Finally, we perform the IDWT on the modified HL & LH coefficients as well as HH and LL coefficients to produce the watermarked Y channel image. Then, the modified luminance, Cb and Cr are combined to get the watermarked color image. Simulation results show that our watermark is robust against high JPEG compression, filtering, Gaussian-noise, resizing and other image processing attacks. In addition, this watermark is not susceptible to any false positive or detection of false reference watermark.

关键词： Image watermarking

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Research of colorde image digital watermark

Research of colorde image digital watermark

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computer science and Information Engineering, CSIE 2012

作者： Shang, Cun Yang, Peng Service Computer Technology and Graphics Lab. Department of Computer Science and Technology Xinyang Agricultural College Xinyang Henan 464000 China

ISBN: (纸本)9783642302220

Digital watermarking is one of the effective technology which can protect the copyright of digital product and data security. For the encoding technology of color image, this paper proposed a method for embedding the watermarking using HSI color model. this paper propose an algorithm based on wavelet analysis, a colored watermark is embedded in a carrier, It embedded the image, which is disordered through ARNOLD transformation into the I space of the carrier image transformed. The results indicate that the watermarking technology proposed by this paper is secure and robust at resistance to compression and resistance to filtering. © 2012 Springer-Verlag GmbH.

关键词： Digital watermarking

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Design and evaluation of multifield visualisation techniques for 2D vector fields

Design and evaluation of multifield visualisation techniques...

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27th Image and Vision Computing New Zealand Conference, IVCNZ 2012

作者： Van Egmond, Chris C. Botha, Charl P. Wünsche, Burkhard C. Graphics Group Department of Computer Science University of Auckland Auckland New Zealand Graphics Group Department of Mediamatics TU Delft Delft Netherlands

ISBN: (纸本)9781450314732

The visualisation of vector fields is essential for many applications in science, engineering and biomedicine. A large number of vector icons has been developed, but little research has been done on their effectiveness, especially when visualising multiple vector fields simultaneously. We apply research in visualisation and cognitive science to identify four classes of post-processing techniques for visualising two 2D vector fields simultaneously: blending, overlay, bump mapping, and masking. We apply these four post-processing methods to Line Integral Convolution (LIC) textures and thus develop several novel multi-field visualisation techniques. We evaluate their effectiveness with a user study requiring participants to locate and classify singularities, and to rate each method on its effectiveness and aesthetic value. The results of the study suggest that blending is the most effective technique to combine multiple vector field visualisation textures, while masking performs worst. There is some evidence that visualisations with smooth colour changes are perceived as visually more attractive, and that aesthetics increases the perceived effectiveness of a visualisation technique. © 2012 ACM.

关键词： Visualization

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Visually guided mesh smoothing for medical applications

Visually guided mesh smoothing for medical applications

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3rd Eurographics Workshop on VisualComputing in Biology and Medicine, EG VCBM 2012

作者： Moench, Tobias Kubisch, Christoph Lawonn, Kai Westermann, Ruediger Preim, Bernhard Department of Simulation and Graphics University of Magdeburg Germany Computer Science Department Technische Universitaet Muenchen Germany

ISBN: (纸本)9783905674385

Surface models derived from medical image data often exhibit artifacts, such as noise and staircases, which can be reduced by applying mesh smoothing filters. Usually, an iterative adaption of smoothing parameters to the specific data and continuous re-evaluation of accuracy and curvature is required. Depending on the number of vertices and the filter algorithm, computation time may vary strongly and interfere with an interactive mesh generation procedure. In this paper, we present an approach to improve the handling of mesh smoothing filters. Based on a GPU mesh smoothing implementation, model quality is evaluated in real-time and provided to the user as quality graphs to support the mental optimization of input parameters. Moreover, this framework is used to find optimal smoothing parameters automatically and to provide data-specific parameter suggestions. © The Eurographics Association 2012.

关键词： Mesh generation

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Controlling in-vehicle systems with a commercial EEG headset: Performance and cognitive load

Controlling in-vehicle systems with a commercial EEG headset...

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International Research and Training Group 1131 Workshop on Visualization of Large and Unstructured Data Sets: Applications in Geospatial Planning, Modeling and Engineering, VLUDS 2011

作者： Cernea, Daniel Olech, Peter-Scott Ebert, Achim Kerren, Andreas Computer Graphics and HCI Group University of Kaiserslautern Germany Computer Science Department ISOVIS Group Linnaeus University Växjö Sweden

ISBN: (纸本)9783939897460

Humans have dreamed for centuries to control their surroundings solely by the power of their minds. These aspirations have been captured by multiple science fiction creations, such as the Neuromancer novel by William Gibson or the Brainstorm cinematic movie, to name just a few. Nowadays, these dreams are slowly becoming reality due to a variety of brain-computer interfaces (BCI) that detect neural activation patterns and support the control of devices by brain signals. An important field in which BCIs are being successfully integrated is the interaction with vehicular systems. In this paper, we evaluate the performance of BCIs, more specifically a commercial electroencephalographic (EEG) headset in combination with vehicle dashboard systems, and highlight the advantages and limitations of this approach. Further, we investigate the cognitive load that drivers experience when interacting with secondary in-vehicle devices via touch controls or a BCI headset. As in-vehicle systems are increasingly versatile and complex, it becomes vital to capture the level of distraction and errors that controlling these secondary systems might introduce to the primary driving process. Our results suggest that the control with the EEG headset introduces less distraction to the driver, probably as it allows the eyes of the driver to remain focused on the road. Still, the control of the vehicle dashboard by EEG is efficient only for a limited number of functions, after which increasing the number of in-vehicle controls amplifies the detection of false commands.

关键词： Brain computer interface

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