The JPEG2000 image compression standard offers scalability features in support of remote browsing applications. In particular Part 9 of the JPEG2000 standard defines a protocol called JPIP for interactivity with JPEG2000 code-streams and files. In client-server application based on JPIP, a client does not directly interact with the compressed file, but formulates requests using a simple syntax which identifies the current "focus window". In this kind of application particularly useful could be a proxy server, that potentially can improve the performance of the system through a better use of the network infrastructure. The aim of this work is to propose a proxy server with JPIP capabilities and shows the benefits that can be brought to remote browsing applications.

In the past decades, most of the research on image and video compression has focused on addressing high bandwidth- constrained environments. However, for high resolution and high quality image and video compression, as in the case of High Definition Television (HDTV) or Digital Cinema (DC), the primary constraints are related to quality and flexibility. This paper presents a comparison between scalable wavelet-based video codecs and the state of the art in single point encoding and it investigates the obtainable compression efficiency when using temporal correlation with respect to pure intra coding

Com a crescente inserção das tecnologias de informação e comunicação (TIC’s) no contexto da sala de aula e, principalmente, no atendimento educacional especializado às pessoas com deficiência visual, percebe-se que para o ensino do Braille ainda são utilizados recursos bem tradicionais, como a reglete. Neste artigo é apresentada uma proposta de inovação, o aplicativo LêBraille, que simula os instrumentos utilizados para o aprendizado em Braille, integrando o processo de aquisição do conhecimento e o mundo digital. Esse sistema possui uma utilização semelhante à reglete, porém o papel utilizado na escrita Braille será substituído por uma tela sensível ao toque, os pontos da célula Braille serão elementos desta tela e a punção corresponderá à pressão exercida pelo dedo do utilizador na tela do dispositivo portátil. Ao capturar as informações puncionadas, ocorrerão manipulações no sistema para reprodução de um retorno perceptível ao usuário, seja por meio de uma saída sonora e/ou tátil.

Adaptation for scalable video is one of the recent challenges in video distribution over modern networks, which are heterogeneous both in terms of available bandwidth and user end terminal capability. Scalable Video Coding offers the possibility to adapt the content following the "quality layer" abstraction. In this work we present a new method to optimally define quality layers using Integer Linear Programming and distortion models. The performances of the proposed approach are comparable with the state-of-the-art methods, but they are obtained with strong complexity reduction and augmented flexibility.