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)
HEVC is the latest video coding standard aimed to compress double to that of its predecessor standard H.264/AVC at the cost of increased coding complexity. Motion Estimation (ME) is one of its critical tools in the encoder whose complexity drastically increases due to the increase in coding block size to 64×64 and due to the introduction of(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)
– Video transcoding is assuming an important role in modern video communication systems in order to allow in-teroperability between different equipment and standards. So far most effort has been spent in transcoding from older standards to the most recent ones. However, as new standards reach higher levels of compression efficiency, the diversity of(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)