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Research of colorde image digital watermark

Research of colorde image digital watermark

引用

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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Classification of gothic and baroque architectural elements

Classification of gothic and baroque architectural elements

引用

2012 19th International Conference on Systems, Signals and Image Processing, IWSSIP 2012

作者： Shalunts, Gayane Haxhimusa, Yll Sablatnig, Robert Institute of Computer Aided Automation Computer Vision Lab. Vienna University of Technology Austria Institute of Computer Graphics and Algorithms Pattern Recognition and Image Processing Lab. Vienna University of Technology Austria

ISBN: (纸本)9783200023284

Architectural elements are the components and details of buildings. Their unique set, combination, design, construction technique form the architectural style of buildings. Building facade classification by architectural styles is viewed as a task of classifying separate architectural structural elements. In the scope of building facade architectural style classification the current paper targets the problem of classification of Gothic and Baroque architectural elements called tracery, pediment and balustrade. Since certain gradient directions dominate on the shape of each architectural element, discrimination between dominating gradients means classification of architectural elements and thus architectural styles. We use local features to describe gradient directions. Our approach is based on clustering and learning of local features and yields a high classification rate. © 2012 Institute of Telecommunica.

关键词： Classification (of information)

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Practical spectral photography

Practical spectral photography

引用

33rd Annual Conference on European Association for computer graphics, EUROgraphics 2012

作者： Habel, Ralf Kudenov, Michael Wimmer, Michael Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Optical Detection Lab. University of Arizona United States

We introduce a low-cost and compact spectral imaging camera design based on unmodified consumer cameras and a custom camera objective. The device can be used in a high-resolution configuration that measures the spectrum of a column of an imaged scene with up to 0.8 nm spectral resolution, rivalling commercial non-imaging spectrometers, and a mid-resolution hyperspectral mode that allows the spectral measurement of a whole image, with up to 5 nm spectral resolution and 120×120 spatial resolution. We develop the necessary calibration methods based on halogen/fluorescent lamps and laser pointers to acquire all necessary information about the optical system. We also derive the mathematical methods to interpret and reconstruct spectra directly from the Bayer array images of a standard RGGB camera. This objective design introduces accurate spectral remote sensing to computational photography, with numerous applications in color theory, colorimetry, vision and rendering, making the acquisition of a spectral image as simple as taking a high-dynamic-range image. © 2012 The Author(s).

关键词： Cameras

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BurnAR: Feel the heat

BurnAR: Feel the heat

引用

11th IEEE and ACM International Symposium on Mixed and Augmented Reality, ISMAR 2012

作者： Weir, Peter Sandor, Christian Swoboda, Matt Nguyen, Thanh Eck, Ulrich Reitmayr, Gerhard Dey, Arindam Magic Vision Lab. University of South Australia Adelaide SA Australia Fairlight Graz University of Technology Graz Austria Institute of Computer Graphics and Vision Graz University of Technology Graz Austria

ISBN: (纸本)9781467346603

Augmented Reality systems that run interactively and in real time, using high quality graphical displays and sensational cues, can create the illusion of virtual objects appearing to be real. This paper presents the design and implementation of BurnAR, a demonstration which enables users to experience the illusion of seeing their own hands burning, which we achieve by overlaying virtual flames and smoke on their hands. Surprisingly, some users reported an involuntary warming sensation of their hands. © 2012 IEEE.

关键词： Smoke

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Evaluation of fast 2D and 3D medical image retrieval approaches based on image miniatures

Evaluation of fast 2D and 3D medical image retrieval approac...

引用

2nd MICCAI International Workshop on Medical Content-Based Retrieval for Clinical Decision Support, MCBR-CDS 2011

作者： Donner, René Haas, Sebastian Burner, Andreas Holzer, Markus Bischof, Horst Langs, Georg Computational Image Analysis and Radiology Lab. Department of Radiology Medical University of Vienna Austria Institute for Computer Graphics and Vision Graz University of Technology Austria Computer Science and Artificial Intelligence Laboratory Massachusetts Institute of Technology Cambridge MA United States

ISBN: (纸本)9783642284595

The present work evaluates four medical image retrieval approaches based on features derived from image miniatures. We argue that due to the restricted domain of medical image data, the standardized acquisition protocols and the absence of a potentially cluttered background a holistic image description is sufficient to capture high-level image similarities. We compare four different miniature 2D and 3D descriptors and corresponding metrics, in terms of their retrieval performance: (A) plain miniatures together with euclidean distances in a k Nearest Neighbor based retrieval backed by kD-trees;(B) correlations of rigidly aligned miniatures, initialized using the kD-tree;(C) distribution fields together with the l1-norm;(D) SIFT-like histogram of gradients using the χ2-distance. We evaluate the approaches on two data sets: the ImageClef 2009 benchmark of 2D radiographs with the aim to categorize the images and a large set of 3D-CTs representing a realistic sample in a hospital PACS with the objective to estimate the location of the query volume. © 2012 Springer-Verlag.

关键词： Medical imaging

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HeartPad: Real-time visual guidance for cardiac ultrasound

HeartPad: Real-time visual guidance for cardiac ultrasound

引用

Workshop at SIGGRAPH Asia 2012, WASA 2012

作者： Ford, Steven T. Viola, Ivan Bruckner, Stefan Torp, Hans Kiss, Gabriel Norwegian University of Science and Technology MI Lab. Department of Circulation and Medical Imaging Trondheim Norway Høgskolen I Nord-Trøndelag Norway University of Bergen Norway Christian Michelsen Research Norway Institute of Computer Graphics and Algorithms Vienna University of Technology Austria St. Olavs Hospital Trondheim Norway

ISBN: (纸本)9781450318358

Medical ultrasound is a challenging modality when it comes to image interpretation. The goal we address in this work is to assist the ultrasound examiner and partially alleviate the burden of interpretation. We propose to address this goal with visualization that provides clear cues on the orientation and the correspondence between anatomy and the data being imaged. Our system analyzes the stream of 3D ultrasound data and in real-time identifies distinct features that are basis for a dynamically deformed mesh model of the heart. The heart mesh is composited with the original ultrasound data to create the data-to-anatomy correspondence. The visualization is broadcasted over the internet allowing, among other opportunities, a direct visualization on the patient on a tablet computer. The examiner interacts with the transducer and with the visualization parameters on the tablet. Our system has been characterized by domain specialist as useful in medical training and for navigating occasional ultrasound users. © 2012 ACM.

关键词： Visualization

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3D reconstruction of urban areas

3D reconstruction of urban areas

引用

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

作者： Poullis, Charalambos You, Suya Cyprus University of Technology Immersive and Creative Technologies Lab. Limassol Cyprus University of Southern California Computer Graphics and Immersive Technologies Lab. Los Angeles United States

ISBN: (纸本)9780769543697

Virtual representations of real world areas are increasingly being employed in a variety of different applications such as urban planning, personnel training, simulations, etc. Despite the increasing demand for such realistic 3D representations, it still remains a very hard and often manual process. In this paper, we address the problem of creating photorealistic 3D scene models for large-scale areas and present a complete system. The proposed system comprises of two main components: (1) A reconstruction pipeline which employs a fully automatic technique for extracting and producing high-fidelity geometric models directly from Light Detection and Ranging (LiDAR) data and (2) A flexible texture blending technique for generating high-quality photorealistic textures by fusing information from multiple optical sensor resources. The result is a photorealistic 3D representation of large-scale areas(city-size) of the real-world. We have tested the proposed system extensively with many city-size datasets which confirms the validity and robustness of the approach. The reported results verify that the system is a consistent work flow that allows non-expert and non-artists to rapidly fuse aerial LiDAR and imagery to construct photorealistic 3D scene models. © 2011 IEEE.

关键词： Optical radar

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Architectural style classification of building facade windows

Architectural style classification of building facade window...

引用

7th International Symposium on Visual Computing, ISVC 2011

作者： Shalunts, Gayane Haxhimusa, Yll Sablatnig, Robert Institute of Computer Aided Automation Computer Vision Lab. Vienna University of Technology Austria Institute of Computer Graphics and Algorithms Pattern Recongition and Image Processing Lab. Vienna University of Technology Austria

Building facade classification by architectural styles allows categorization of large databases of building images into semantic categories belonging to certain historic periods, regions and cultural influences. Image databases sorted by architectural styles permit effective and fast image search for the purposes of content-based image retrieval, 3D reconstruction, 3D city-modeling, virtual tourism and indexing of cultural heritage buildings. Building facade classification is viewed as a task of classifying separate architectural structural elements, like windows, domes, towers, columns, etc, as every architectural style applies certain rules and characteristic forms for the design and construction of the structural parts mentioned. In the context of building facade architectural style classification the current paper objective is to classify the architectural style of facade windows. Typical windows belonging to Romanesque, Gothic and Renaissance/Baroque European main architectural periods are classified. The approach is based on clustering and learning of local features, applying intelligence that architects use to classify windows of the mentioned architectural styles in the training stage. © 2011 Springer-Verlag.

关键词： Semantics

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An interactive augmented reality coloring book 11

An interactive augmented reality coloring book

引用

SIGGRAPH Asia 2011 Emerging Technologies, SA'11

作者： Clark, Adrian Dünser, Andreas Grasset, Raphaël HIT Lab. NZ University of Canterbury Christchurch New Zealand Institute for Computer Graphics and Vision Graz University of Technology Austria

Creating entertaining and educational books not only requires providing visually stimulating content but also means for students to interact, create, and express themselves.

ISBN: (纸本)9781450311366

Creating entertaining and educational books not only requires providing visually stimulating content but also means for students to interact, create, and express themselves.

关键词： Interactive computer graphics

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Importance-driven compositing window management 11

Importance-driven compositing window management

引用

Proceedings of the SIGCHI Conference on Human Factors in Computing Systems

作者： Waldner, Manuela Steinberger, Markus Grasset, Raphael Schmalstieg, Dieter Institute for Computer Graphics and Vision Graz University of Technology Graz Austria HIT Lab. NZ University of Canterbury Christchurch New Zealand

ISBN: (纸本)9781450302289

In this paper we present importance-driven compositing window management, which considers windows not only as basic rectangular shapes but also integrates the importance of the windows' content using a bottom-up visual attention model. Based on this information, importance-driven compositing optimizes the spatial window layout for maximum visibility and interactivity of occluded content in combination with see-through windows. We employ this technique for emerging window manager functions to minimize information overlap caused by popping up windows or floating toolbars and to improve the access to occluded window content. An initial user study indicates that our technique provides a more effective and satisfactory access to occluded information than the well-adopted Alt+Tab window switching technique and see-through windows without optimized spatial layout. Copyright 2011 ACM.

关键词： Behavioral research

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