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Publicações

Publicações por Paula Viana

2023

A Dataset for User Visual Behaviour with Multi-View Video Content

Autores
da Costa, TS; Andrade, MT; Viana, P; Silva, NC;

Publicação
PROCEEDINGS OF THE 2023 PROCEEDINGS OF THE 14TH ACM MULTIMEDIA SYSTEMS CONFERENCE, MMSYS 2023

Abstract
Immersive video applications impose unpractical bandwidth requirements for best-effort networks. With Multi-View(MV) streaming, these can be minimized by resorting to view prediction techniques. SmoothMV is a multi-view system that uses a non-intrusive head tracking mechanism to detect the viewer's interest and select appropriate views. By coupling Neural Networks (NNs) to anticipate the viewer's interest, a reduction of view-switching latency is likely to be obtained. The objective of this paper is twofold: 1) Present a solution for acquisition of gaze data from users when viewing MV content; 2) Describe a dataset, collected with a large-scale testbed, capable of being used to train NNs to predict the user's viewing interest. Tracking data from head movements was obtained from 45 participants using an Intel Realsense F200 camera, with 7 video playlists, each being viewed a minimum of 17 times. This dataset is publicly available to the research community and constitutes an important contribution to reducing the current scarcity of such data. Tools to obtain saliency/heat maps and generate complementary plots are also provided as an open-source software package.

1993

PC-BASED ARCHITECTURE TO ACCESS REMOTE IMAGE DATABASES

Autores
LEAL, F; OLIVEIRA, C; SILVA, J; VIANA, P; CARRAPATOSO, E;

Publicação
VIDEO COMMUNICATIONS AND PACS FOR MEDICAL APPLICATIONS

Abstract
This contribution describes a Videotex terminal with photographic capabilities based on a personal computer (PC). This system takes advantage of a recently available support - the Integrated Services Digital Network (ISDN) - which represents a significant improvement in the performance of communication systems, and is intended to offer a new and practical service while maintaining compatibility with the Alphamosaic Videotex.

1993

<title>PC-based architecture to access remote image databases</title>

Autores
Leal, F; Oliveira, C; Silva, JA; Viana, P; Carrapatoso, E;

Publicação
Video Communications and PACS for Medical Applications

Abstract

1997

The unification of OMT, SDL and IDL for service creation

Autores
Loftus, C; Sherratt, E; Inocencio, E; Viana, P;

Publicação
SDL '97 - TIME FOR TESTING: SDL, MSC AND TRENDS

Abstract
Like many other subjects, SDL is embroiled in the fusion of the Telecom and Information systems worlds. This represents a shift from the predominant use of SDL in relatively closed Telecom areas to the more and more widely used open distributed processing environments. ACTS project AC227, SCREEN, is working to improve the creation of distributed telematic services. This paper presents some of the issues and challenges that these new environments present to SDL language, and the rationale for combing SDL with OMT and the targeting to CORBA compliant environments.

2000

<title>Case study on the use of agent technology for the management of networked multimedia systems</title>

Autores
Viana, P; Alves, AP;

Publicação
Internet Multimedia Management Systems

Abstract

1997

Code generation strategy for CORBA-based internet applications

Autores
Loftus, CW; Olsen, A; Inocencio, E; Viana, P;

Publicação
Proceedings of the International Enterprise Distributed Object Computing Workshop, EDOC

Abstract
We present an integrated approach (practices) to object-oriented, distributed, application development that covers all phases of software development: requirements capture, analysis, design (structural and behavioural), simulation and targeting to CORBA-based distributed processing environments. We focus on a code generation strategy that addresses and supports all phases of the practices. We highlight code generation objectives including support for multiple paths through the practices, reuse of existing tool-sets and support for traceability. We describe one path in more detail and present an example of design OMT to SDL translation based on labelling in OMT. We describe two development environments used in the project and analyse them with respect to their support for our code generation objectives. Our tool adaptation work is addressing identified weaknesses. This includes an SDL to Java/CORBA code generator, the generation of CORBA-to-SDL-mapping C++ wrappers for C code generated by existing tools and the use of CORBA to integrate development tools and support traceability.

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