EGMM: EG Multimedia Workshop

Permanent URI for this community

https://diglib.eg.org/handle/10.2312/350

Browse

Now showing 1 - 20 of 41

2BeOn - Interactive Television Supporting Interpersonal Communication
(The Eurographics Association, 2001) Abreu, Jorge; Almeida, Pedro; Branco, Vasco; J.A.Jorge and N.M.Correia and H.Jones and M.B.Kamegai
Interpersonal communication mediated by computer services supports the reinforcement and emergence of new communities brought together by leisure or work interests. This paper presents a workbench system that aims to study how the same principle can be applied in interactive television. The main objective is to allow TV users to be online (2BeOn) through the integration of basic and advanced communication services, enabling them to reinforce their interpersonal communication. The 2BeOn system is based on four core components: user tracking, communication services, interface engine and collaboration content/interaction tracing. In addition to the social and behavioural context of the system, its conceptualisation, prototyping and evaluation are addressed.
3D-dvshop: a 3D Dynamic Virtual Shop
(The Eurographics Association, 2001) Sann, A.; Montrucchio, B.; Montuschi, P.; Demartini, C.; J.A.Jorge and N.M.Correia and H.Jones and M.B.Kamegai
In recent years, virtual rality has shown all its potential in a large spectrum of applications: training, simulation, CAD, and so on. Although existing technologies allow the creation of immersive virtual reality browsing experiences, little has been devoted to applying this new tool to electronic commerce (e-commerce) since almost all e-commerce web sites present products in a 2D on-line catalog. In this paper we present 3D-dvshop, a dynamic 3D virtual shop: a user can build his or her own shop, choosing a set of products that will be dynamically placed in a collection of specially created 'rooms'. The use of technologies such as VRML and Java allows full 3D interaction with products. In this way, the browsing experience can be more natural, attractive, realistic, and fun.
Abstractions in Multimedia Authoring: The MAVA Approach
(The Eurographics Association, 2001) Hauser, Juergen; Tian, Jing; J.A.Jorge and N.M.Correia and H.Jones and M.B.Kamegai
The support of abstractions in authoring systems increases the efficiency of the specification of multimedia documents. Authoring based on a very low abstraction, for example script programming, is very complex and time consuming. In addition, authoring systems supporting a high abstraction are so far restricted to one specific application area. This paper presents an extensible approach that supports abstractions in different application areas (such as computer- based training or a travel guide). In this approach a meta document model and the corresponding presentation and authoring system are developed. During conception of the authoring system, different concepts (e.g. templates or application specific views) have been realized to introduce further abstractions.
Adaptive Visualization of Distributed 3D Documents Using Image Streaming Techniques
(The Eurographics Association, 2001) Loeffler, Jobst; Fellner, Dieter W.; J.A.Jorge and N.M.Correia and H.Jones and M.B.Kamegai
With the emergence of open information spaces such as digital libraries, advanced techniques for interactive visualization of complex and protected 3D documents are needed. This paper presents a new visualization concept which deals with the problems of complexity and security of digital 3D documents in open information spaces. A dynamic combination of remote and local 3D rendering is used to allow scaling of the information quantity on the client side. The software architecture SCA3D (3D Scalable Scenes Architecture), which provides functionality for adaptive visualization and protection of intellectual property rights, is presented.
Analysis of Inter-Frame Coding Without Intra Modes in H.264
(The Eurographics Association, 2004) Cheng, Yun; Wang, Zhiying; Dai, Kui; Guo, Jianjun; N. Correia and J. Jorge and T. Chambel and Z. Pan
H.264/AVC is a new international standard for video coding which has great advantage of coding efficiency com-pared with other standards. It can save about 50% bit-rate compared with that of the successful prior coding stan-dards under the same reconstructed picture quality. But the high coding efficiency is acquired by heavily computa-tion. In this paper, the coding mode and algorithm for mode decision are introduced firstly, then transform and quantization are analyzed and experiments on inter-frame coding with or without intra modes are performed. The experiment results illustrate that the encoding method without intra modes in inter-frame coding will decrease the encoding time from 76.03% to 50.09% compared with that of the standard encoding method, while the PSNR-Y will change from -0.45dB to +0.20dB (most cases are ±0.10dB) at the same bit-rates.
Animating Peer-Level Annotations Within Web-Based Multimedia
(The Eurographics Association, 2004) Bulterman, Dick; N. Correia and J. Jorge and T. Chambel and Z. Pan
The TabletPC is an example of a new generation of user interface device where pen-based manipulation of information is integrated directly into a user s workflow. Using the TabletPC's existing pen and electronic ink systems, a wide range of static documents can be created or annotated. While the facilities of the TabletPC are useful for creating virtual images containing ink that can be overlaid on text or picture context, there is little support for creating annotations of time-based content such as video. This article describes an annotation authoring model and interface for creating peer-level annotations to video media. Peer-level annotations allow existing content to be enriched with additional content annotations that can be co-presented with the original media. A system for creating a SMIL language document containing SVG-based annotations that exist along-side the visual content is described, along with a discussion of the needs and limitations of supporting video markup in a web context. An example using peer-level annotations in a medical context is provided.
Authentication of Volume Data Using Wavelet-Based Foveation
(The Eurographics Association, 2001) Kankanhalli, M. S.; Chang, E.-C.; Guan, X.; Huang, Z.; Wu, Y.; J.A.Jorge and N.M.Correia and H.Jones and M.B.Kamegai
3D volume data has been increasingly used in many appli- cations. The digital nature of the data allows easy creation, copying and distribution. However, it also allows ease of manipulation which can enable wilful or inadvertent misrepresentation of the content. For an ap- plication like medical imaging, this can have serious diagnostic and legal implications. Thus there is a strong need to establish the integrity of a particular volume data-set. We argue that the traditional data authenti- cation mechanisms like digital signatures or cryptographic methods are not very useful in this context due to their extreme fragility. What is required is a method that can detect the integrity for allowable content- preserving manipulations.We have developed a novel authentication pro- cedure which is robust against benign content manipulation. The volume data can be robustly authenticated under normal operations such as scal- ing, resampling and additive Gaussian noise. On the other hand, it offers protection against any malefic or unintentional data manipulation which significantly changes the content of the volume data-set. Such manipu- lations include cropping, changing of voxel values etc. Our method uses segmentation, wavelet-based foveation, and encryption to achieve this. We have implemented the method and tested its robustness for several manipulations.
Buoy Indexing of Metric Feature Spaces for Fast Approximate Image Queries
(The Eurographics Association, 2001) Volmer, Stephan; J.A.Jorge and N.M.Correia and H.Jones and M.B.Kamegai
A novel indexing scheme for solving the problem of nearest neighbor queries in generic metric feature spaces for content-based image retrieval is proposed to break the 'dimensionality curse.' The basis for the proposed method is the partitioning of the feature dataset into clusters that are represented by single buoys. Upon submission of a query request, only a small number of clusters whose buoys are close to the query object are considered for the approximate query result, effectively cutting down the amount of data to be processed enormously. Results concerning the retrieval accuracy from extensive experimentation with a real image archive are given. The influence of control parameters is investigated with respect to the tradeoff between retrieval accuracy and computational cost.
A Chinese Remainder Theorem Oriented Information Hiding Scheme
(The Eurographics Association, 2004) Chang, Chin-Chen; Lu, Tzu-Chuen; N. Correia and J. Jorge and T. Chambel and Z. Pan
Steganography is an information hiding technique that conveys secret information in a host signal using a secret method. Only the receivers and senders know the secret information. Many researchers have proposed their own steganographic techniques to hide information in various host signals, such as audios, videos, images, and so on. Nevertheless, most of the methods degrade the visual quality of the image when more information is hidden in the image. Therefore, this paper proposes a new steganographic scheme, which is based on the Chinese Remainder Theorem. The abbreviation of the scheme is CRTIH, and it not only conceals a larger amount of information in a hidden image but also upgrades the visual quality of the image.
A Component-based Authoring Environment for Creating Multimedia-RichMixed Reality
(The Eurographics Association, 2004) Abawi, Daniel; Dörner, Ralf; Grimm, Paul; N. Correia and J. Jorge and T. Chambel and Z. Pan
Applications that seek to combine multimedia with Mixed Reality (MR) technologies in order to create multimediarich MR environments pose a challenge to authors who need to provide content for such applications. Founded on a component-based authoring paradigm, production processes as well as tools that serve as a supportive authoring environment for these authors are presented in this paper. For this, not only requirements that stem from multimedia authoring or MR authoring alone have been identified but also authoring tasks that are only present in the creation of multimedia-rich MR content. Concepts for supporting these tasks within a componentbased authoring framework (e.g. the specification of phantom objects) are presented. The resulting authoring tools are discussed - one of their main advantages is that they provide a direct preview of the content for the author. This allows multimedia authors who are not familiar with MR methodologies to quickly gain experience with multimedia-rich MR content creation.
Content Based Image Public Watermarking
(The Eurographics Association, 2004) Hengfu, Yang; Zihua, Yang; Mingfang, Jiang; N. Correia and J. Jorge and T. Chambel and Z. Pan
In this paper, a content based image public watermarking technique which operates in DCT domain is proposed. First, the 8×8 DCT sub-blocks of the host image are rearranged into a Hilbert sequence in Hilbert scanning order, then two neighboring sub-blocks in the Hilbert sequence is pseudo-randomly selected by using chaotic sequences. Then a watermark with visually recognizable pattern is embedded into the original image by changing the polarity of the corresponding middle-frequency coefficients in the two chosen neighboring sub-blocks, and the watermark is adapted to the image by exploiting the masking characteristics of the human visual system (HVS), thus ensuring the watermark invisibility, and the watermark don't need the original image. The experimental results show that the proposed algorithm in this paper is robust to common signal processing techniques and some geometric distortions, such as cropping, scaling and rotation. Especially, it achieves high robustness under signal enhancement operations, such as sharpening, contrast enhancement, edge enhancement and histogram equalization.
Content Based Retrieval of VRML Objects - An Iterative and Interactive Approach
(The Eurographics Association, 2001) Elad, Michael; Tal, Ayellet; Ar, Sigal; J.A.Jorge and N.M.Correia and H.Jones and M.B.Kamegai
We examine the problem of searching a database of three-dimensional objects (given in VRML) for objects similar to a given object. We introduce an algorithm which is both iterative and interactive. Rather than base the search solely on geometric feature similarity, we propose letting the user influence future search results by marking some of the results of the current search as 'relevant' or 'irrelevant', thus indicating personal preferences. A novel approach, based on SVM, is used for the adaptation of the distant measure consistently with these markings, which brings the 'relevant' objects closer and pushes the 'irrelevant' objects farther. We show that in practice very few iterations are needed for the system to cenverge well on what the user 'had in mind'.
Door Access Control Using Human Face and Height
(The Eurographics Association, 2004) Zhang, H. X.; Ma, R. H.; Huang, W. M.; Huang, Z.; N. Correia and J. Jorge and T. Chambel and Z. Pan
Access control has much attracted research interest recently. In this paper, we propose a method using human face and height as human trait to recognize a person. We observe that eye location extracted from a human face is sta-ble to be used to compute his/her height to the ground. Using it together with face recognition can increase the ac-curacy of the access control. We have implemented the method on a PC installed with a stereo camera. The design criteria, techniques, implementation details, and performance testing are presented. Keywords: 3D reconstruction, gradient descent method, biometric fusion, application.
DynaVideo - A Dynamic Video Distribution Service
(The Eurographics Association, 2001) Leite, Luiz Eduardo; Alves, Renata; Lemos, Guido; Batista, Thais; J.A.Jorge and N.M.Correia and H.Jones and M.B.Kamegai
Most solutions proposed to implement audio and video distribution services have been designed for specific infrastructures or have been tailored to specific application requirements, such as stream and clients types which will be supported by the service. Other important aspect in this context is that the performance of distributed services is becoming increasingly variable due to changing load patterns and user mobility. This paper presents the Dynamic Video Distribution Service - DynaVideo. The service may be designed to distribute video in a way that is independent of the video format and to interact with different types of clients. The main feature of DynaVideo is the ability to configure the service dynamically to a specific demand.
Effective Exercise Instruction System Using Virtual Human
(The Eurographics Association, 2001) Itami, Yoshikazu; Yoshida, Norimasa; Kitajima, Katsuhiro; J.A.Jorge and N.M.Correia and H.Jones and M.B.Kamegai
This study aims at developing an aerobics exercise instruction software for personal use by introducing an instruction program best fit to the physical conditions of respective exerciser. The software uses the combination of virtual instructor (virtual human) and Karvonen method in order to develop a comprehensive personal aerobics exercise instruction software. Karvonen method is an algorithm of relationship between the movement of the virtual human and exercise intensity. In this study, its effectiveness is verified and confirmed. The study is mainly focused on the development of synchronization technique between the speed of animation figures' movement for controlling exercise intensity and speed of the sound output, which is the most important technique in the application of the study result into practical use.
Estimating Traffic Density Using Sounds of Moving Vehicles
(The Eurographics Association, 2004) Kato, Jien; Hiramatsu, Yoshitaka; Watanabe, Toyohide; N. Correia and J. Jorge and T. Chambel and Z. Pan
This paper proposed a method for automatically estimating traffic density by using sounds of moving vehicles. The approach is based on the idea of recognition of the temporal variations that appear on the power signals when vehicles pass through an observation point. The local temporal variations in small periods of time are extracted by wavelet transformation and are used as an observation sequence for a hidden Markov model, which models the global temporal variations of the power signal. The passages of vehicles are detected based on the state transitions of the HMM. The occlusion problem due to the overlapping of the sounds of moving vehicles are dealt with by corresponding two set of information from a stereo microphone. Experimental results show that with some restrictions, the passages of vehicles are able to be detected from road traffic sounds in good accuracy, by the proposed method.
Extended Format Definition and Quality-driven Format Negotiation in Multimedia Systems
(The Eurographics Association, 2001) Lohse, Marcos; Slusallek, Philipp; Wambach, Patrick; J.A.Jorge and N.M.Correia and H.Jones and M.B.Kamegai
Multimedia middleware needs to support a wide variety of devices together with their respective data formats. This becomes increasingly relevant and difficult in a distributed environment where new devices and formats can become available at any time and must be taken into account when deciding how to set up a flowgraph of distributed multimedia components. In this paper we present an automatic algorithm for configuring and connecting a high-level flowgraph of multimedia components. Given this abstract flowgraph of participating devices and key components, the algorithm automatically selects necessary additional components, chooses suitable formats, and connects the flowgraph, while trying to achieve the best possible quality.
Image-based Rendering of the AnisotropicBRDF ofWoven Fabrics
(The Eurographics Association, 2004) Takeda, Yuki; Viet, Huynh Quang Huy; Tanaka, Hiromi T.; N. Correia and J. Jorge and T. Chambel and Z. Pan
The reflectance of fabric surface is commonly represented by a 4D bidirectional reflectance distribution function (BRDF). To generate the BRDF from measured data by a gonioreflectometer with 2 degrees of freedom of the light source and 2 degrees of freedom of the observing direction, it requires an enormous amount of measurements. In this paper, we propose an efficient image-based method for rendering the anisotropic BRDF of woven fabrics based on the micro facet surface geometry determined by the cross-sectional shape of fibers, twist of yarns, and type of weave. At first, we examine the relationship between the reflectance properties and the micro facet surface geometry of a type of woven fabric such as silk-like synthesized fabric. Next, we develop an image-based method for generating the BRDF of woven fabrics from measurement of the reflectances caused by the incident light only in the direction perpendicular to the fabric s surface. The simulation results on arbitrarily colored dresses show the performance of the proposed approach.
Interactive, Evolutionary Textured Sound Composition
(The Eurographics Association, 2001) Fels, Sidney; Manzolli, Jonatas; J.A.Jorge and N.M.Correia and H.Jones and M.B.Kamegai
We describe a system that maps the interaction between two people to control a genetic process for generating music. We start with a population of melodies encoded genetically. This population is allowed to breed every biological cycle creating new members of the population based upon the semantics of the spatial relationship between two people moving in a large, physical space. A pre-specified hidden melody is used to select a melody from the population to play every musical cycle. The overlapping of selected melodies provides an intriguing textured musical space.
LIVE@WEB.COM Using CBIR Technology in InteractiveWeb-TV
(The Eurographics Association, 2001) Morsdorf, Felix; Volmer, Stephan; J.A.Jorge and N.M.Correia and H.Jones and M.B.Kamegai
The increasing amount of internet based television broadcasts has lead to new approachs to interactivity in TV programs. We developed a system which is able to supply the viewer of the program upon interaction with information relating to the program, only based on the low-level visual content of the scene. This aim is achieved by comparing signatures describing the visual content of single frames of the video with a remote database of signatures derived from known videos. The database actually links the visual information contained in the signatures to some second-level information interesting for the user. Two main problems in extending CBIR technology to videos must be overcome, one is the extraction of the visual information out of the highly redundant video material, and the other is reducing the matching time of the system enough to allow for web-based interactivity.

Browse

Browsing EGMM: EG Multimedia Workshop by Title

Results Per Page

Sort Options