a Department of Gynecology and Obstetrics, hôpital La Conception, 147, boulevard Baille, 13385 Marseille cedex 5, France b Multidisciplinary Center for Prenatal Diagnosis, Children’s Hospital La Timone, 264, rue Saint-Pierre, 13385 Marseille cedex 5, France c Obstetric ultrasound unit, pôle Parents-enfants, hôpital Saint-Joseph—Marseille, 26, boulevard de Louvain, 13285 Marseille cedex 08, Fran...

Mobile-to-mobile video communications is one of the most requested services which operator networks can offer. However, in a framework where one mobile device sends video information to another, both transmitter and receptor should employ video encoders and decoders with low complexity. On the one hand, traditional video codecs, such as H.264, are based on architectures which have encoders with...

To study the requirements for assembly of MHC class I molecules with antigenic peptides in the endoplasmic reticulum (ER), we studied Ag processing in insect cells. Insects lack a class I recognition system, and their cells therefore provide a "blank slate" for identifying the proteins that have evolved to facilitate assembly of class I molecules in vertebrate cells. H-2Kb heavy chain, mouse be...

The mosquitocidal toxin (MTX) from Bacillus sphaericus SSII-1 is a approximately 97-kDa protein sharing sequence homology within the N terminus with the catalytic domains of various bacterial ADP-ribosyltransferases. Here we studied the proteolytic activation of the ADP-ribosyltransferase activity of MTX. Chymotrypsin treatment of the 97-kDa MTX holotoxin (MTX(30-870)) results in a 70-kDa putat...

This paper presents selective intra coding and early inter skip fast mode decision algorithm for H.264/AVC and compares performance of H.264/AVC with prior standards. Video coding standard H.264/AVC provides gains in compression efficiency of up to 50% over a wide range of bit rates and video resolutions compared to previous standards. In order to achieve this, a robust rate-distortion optimiza...

The H.264 video coding standard, owing to its excellent compression efficiency, has become the key technology of many video applications. But the H.264/AVC video is very vulnerable to data errors or packet losses. In this paper, we propose a new H.264 error concealment technique that exploits the depth relevance between spatially or temporally neighboring blocks. The motion vectors gathered fro...

To enable robust video transmission over heterogeneous networks, the hierarchical B-picture prediction structure is employed in the state-of-the-art video coding standard H.264/SVC, aiming to produce scalable bitstreams with various frame rates. However, the exhaustive mode decision process with the hierarchical B-picture structure increases the computational complexity of H.264/SVC encoding dr...

The wide deployment of MPEG-2 video and the extra benefits of the features introduced by the H.264/AVC standard, create a strong need for video transcoding between these standards. In this paper the typical problems for video transcoding between MPEG-2 and H.264/AVC are discussed. One of the most basic problems is the difference between the 8x8 Discrete Cosine Transform as used by MPEG-2, and t...