A novel type of pH-responsive biodegradable copolymer was developed based on methyloxy-poly(ethylene glycol)-block-poly[dopamine-2-(dibutylamino) ethylamine-l-glutamate] (mPEG-b-P(DPA-DE)LG) and applied to act as an intelligent nanocarrier system for magnetic resonance imaging (MRI). The mPEG-b-P(DPA-DE)LG copolymer was synthesized by a typical ring opening polymerization of N-carboxyanhydrides...

termarking of MPEG-1 and MPEG-2 compressed pplied directly in the domain of MPEG-1 system multiplexed streams). Perceptual models are used avoid degradation of the video quality. The waterginal video sequence. A modified correlation-based ear preprocessing before correlation. Experimental d scheme is able to withstand several common atis very fast and therefore, suitable for copyright

In this paper we exploit the possibilities offered by MPEG-4, through XMT-A and XMT-O, by implementing an Impress extension that translates an electronic presentation to XMT-O, so to be finally compiled for MPEG-4 conversion. We have implemented this conversion tool and in this paper we describe our implementation and analyze its results. Key-Words: Data Compression, MPEG, Impress.

Content-based management of three-dimensional data in the framework of the MPEG-7 standard is considered. An overview on MPEG-7 and three-dimensional data is presented. Descriptors and description schemes suitable for three-dimensional data are introduced and their integration in the framework of MPEG-7 is detailed. The shape descriptors are based on cords, wavelet transform and three-dimension...

Multimedia streaming is becoming increasingly popular. The multimedia standard MPEG-4 was designed to support scenes of different levels of complexity and applications with low bandwidth up to very high bandwidth requirements. Scalable video encoding is supported as well. This allows MPEG-4 streaming software to adapt video quality dynamically in the network to currently given QoS conditions. W...

Decoding MPEG-2 video streams imposes hard realtime constraints for consumer devices such as TV sets. The freedom of encoding choices provided by the MPEG-2 standard results in high variability inside streams, in particular with respect to frame structures and their sizes. In this paper, we identify realistic timing constraints demanded by MPEG-2 video decoding. We present results from a study ...

HDTV 60 million households will have at least one wide screen, High-Definition TV display in their home by the end of 2007, according to In-Stat predictions. The ability to produce broadcast quality compressed video in realtime makes 3ivx MPEG-4 5.0 uniquely suited for HDTV production environments. 3ivx produces high quality HD MPEG-4 Video with 5.1 Surround Sound MPEG-4 AAC Audio in less than ...

In this paper, a structure of a hybrid highly scalable video encoder with fine granularity scalability in a scheme based on a modified version of the classic MPEG-2 scalable encoder is proposed. The assumption is that high level of compatibility with the MPEG video coding standards would be ensured. In particular, it is assumed that the low-resolution base layer bitstream is fully compatible wi...

The transcoding of MPEG video streams is important in a variety of situations such as in rate reduction for small bandwidth downstream channels and in extracting a fast visual playback stream for digital video cassette recorders. This paper addresses transcoding of MPEG intra-coded frames by selectively copying DCT AC coefficients from the primary MPEG stream into the secondary MPEG stream. A r...

The MPEG-4 standard describes a multimedia format that allows to combine vector based data with audio and video. This makes it possible to store and transmit lectures created with the E-Chalk system without any loss of semantics. Utilizing the infrastructure already available for MPEG-4 promises the possibility of getting rid of a proprietary lecture format. This article presents the implementa...