Antonio Navarro

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The main purpose of this paper is to show that once the video source coding is dependent on the channel characteristics, better performance can be achieved in terms of reconstructed video quality. Our study considers a fixed overall bit rate transmission of 64 kbit/s over error prone memoryless binary channels and the source coder is the ITU-T H.263 video(More)
The GMF4iTV project (Generic Media Framework for Interactive Television) is an IST European project that developed an end−to−end broadcasting platform providing interactivity on heterogeneous multimedia devices such as Set−Top−Boxes, PCs and PDAs according to the Multimedia Home Platform (MHP) part of the DVB standard. The developed platform allows the(More)
In this paper we propose a fast method to convert H.264/AVC Integer Transform (IT) coefficients to Discrete Cosine Transform (DCT) coefficients for applications in video transcoding. We derive the transform kernel matrix for converting, in the transform domain, four IT coefficient blocks into one 8 8 × DCT block of coefficients. By exploiting the symmetry(More)
Unlike in data communications, multimedia communications through heterogeneous networks is still far away of being achieved due to lacking of solutions at all protocol layers. The main objective of this research work is to evaluate the performance of a high frequency (HF) wireless network for transporting multimedia services. Beyond of allowing(More)
Rapid growth of emerging medical applications such as e-health and tele-medicine requires fast, low cost, and often lossless access to massive amount of medical images and data over bandlimited channels. In this paper, we first show that significant amount of correlation and redundancy exist across different medical images. Such a correlation can be(More)