A hybrid object-oriented very low bit rate video codec

International Journal of Computational Vision and Robotics, 2011

MPEG4 is an ISO/IEC standard developed by moving picture experts group (MPEG). The standard video MPEG-4 visual (part 2) introduces the notion of video objects (VO). Basically, the concept of the MPEG-4 compression relies on contents. On the other hand, the standard MPEG-4 AVC/H.264 (part 10) relies on the same architecture used in MPEG-2, which does not introduce the concept of video objects. The performances of these video coders depend mainly on motion estimation.

IEEE Journal on Selected Areas in Communications, 1998

This paper describes a prototype video coding platform 1 meant for the conception and testing of multimedia products such as next-generation videophones. The platform is largely based on ITU-T Recommendation H.263, with a number of additional object-oriented quality enhancement features which make it especially well suited for very low bit-rate coding of "headand-shoulders" video material typical of real-time multimedia applications, video teleconferencing, and video telephony. These features consist of: 1) segmentation into objects of interest, 2) segmentation-based prefiltering, 3) model-assisted rate control, 4) adaptive vector quantization, and finally 5) segmentation-based postfiltering. In the spirit of Recommendation H.263, these enhancements are modular and can be selectively turned on or off, thereby enabling a wide variety of coding modes.

Communications of The ACM, 1991

The Moving Picture Experts Group (MPEG) standard addresses compression of video signals at approximately 1.5M-bits. MPEG is a generic standard and is independent of any particular applications. Applications of compressed video on digital storage media include asymmetric applications such as electronic publishing, games and entertainment. Symmetric applications of digital video include video mail, video conferencing, videotelephone and production of electronic publishing. Design of the MPEG algorithm presents a difficult challenge since quality requirements demand high compression that cannot be achieved with only intraframe coding. The algorithm's random access requirement, however, is best satisfied with pure intraframe coding. MPEG uses predictive and interpolative coding techniques to answer this challenge. Extensive details are presented.

IEEE Transactions on Circuits and Systems for Video Technology, 2000

Multimedia Tools and Applications, 2012

Distributed Video Coding (DVC) is a video coding paradigm in which the computational complexity is shifted from the encoder to the decoder. DVC is based on information theoretic results suggesting that, under ideal conditions, the same rate-distortion performance can be achieved as for traditional video codecs. In practice however, there is still a significant performance gap between the two coding architectures. One of the main reasons for this gap is the lack of multiple coding modes in current DVC solutions. In this paper, we propose a block-based distributed video codec that supports three coding modes: Wyner-Ziv, skip, and intra. The mode decision process is entirely decoder-driven. Skip blocks are selected based on the estimated accuracy of the side information. The choice between intra and Wyner-Ziv coding modes is made on a rate-distortion basis, by selecting the coding mode with the lowest rate while assuring equal distortion for both modes. Experimental results illustrate that the proposed block-based architecture has some advantages over classical bitplane-based approaches. Introducing skip and intra coded blocks yields average bitrate gains of up to 33.7% over our basic configuration supporting Wyner-Ziv mode only, and up to 29.7% over the reference bitplane-based DISCOVER codec. is with the Department of Electronics and Informatics (ETRO) of VUB, and since 2006 he holds a professorship at ETRO. His research interests include scalable still image and video coding, multiresolution image analysis, image and video transmission over networks, video segmentation and indexing, scalable mesh coding, error resilient coding and statistical modeling. He is the author and co-author of more than 180 scientific publications, patent applications and contributions to standards, and has contributed to four books in his areas of interest.

IEEE Signal Processing Magazine, 2000

INFORMATION technology issues & challenges, 2009

The recent development of multimedia applications made them one of the most popular and most demanding types of workloads. To meet the new requirements and to map all new multimedia functionality onto systems with restricted resources a dramatical need of visual data compression standards arose. This paper discusses the performance requirements of the MPEG standards and outlines some approaches to meet these requirements. The focus is on the first representative of the latest generation visual data compression standards-MPEG-4. Its computational requirements and new architectural demands are analyzed. An innovative reconfigurable ¢-architectural approach is presented as a new concept for a flexible and cost-effective implementation of multimedia processors. At the expense of three new instructions, the proposed mechanisms allow instructions, entire pieces of code, or their combination to execute in a reconfigurable manner. These three instructions are proposed as an ISA extension of a super-scalar processor to illustrate the advantages of this new concept.

Proceedings 2003 International Conference on Image Processing (Cat. No.03CH37429), 2003

In this paper we present a novel object based video coder. This coder is based on an analysis-synthesis approach which allows for decoupling shape, motion and texture informations. These informations are then coded using wavelets decomposition and progressive coding allowing to have full scalability (object, SNR, temporal, and bitstream scalabilities). Experimental results show the benefits of proposed scheme providing performances close to state of the art video coders while providing scalability.

IEEE Transactions on Consumer Electronics, 1998

A h t r a c t T h e MPEG-4 specification was developed in response to the growing need for a coding method that can facilitate dynamic access to audiovisual objects for various applications such as digital storage media, internet, various forms of wired or wireless communication etc.. Although the specification is still in the working draft stage, the concepts and technologies of the specification are very encouraging and will inspire a lot of creative works in the multimedia applications. This paper is devoted to the rsoftware implementation of the video part of MPEG4. We develop a prototype of MPEG4-like video encoder and a prototype of Java-based video decoder, which can be executed on Internet, in the client-server model by using Java Applet. The prototype can show us the strong functionality of MPEG-4 that includes user interactivity and object scalability, etc.