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C O L L A B O R A T I O N S

N E W S

E V E N T S

Time-Frequency Analysis

The algorithms for Multimedia data processing are mostly based and derived from the general signal processing techniques, using standard transforms such as Fourier transform, Discrete cosine transform, Wavelets transform, etc. + more <h3 id="l1naslov"> Time-Frequency Analysis </h3> <p id="l1text"> The algorithms for Multimedia data processing are mostly based and derived from the general signal processing techniques, using standard transforms such as Fourier transform, Discrete cosine transform, Wavelets transform, etc. In order to keep up with the advanced multimedia applications, we focus our research on innovative joined Time-Frequency Analysis fostering highly efficient and comprehensive solutions aiming to provide enhanced performance comparing to the conventional ones. </p>

Compressive Sensing

In order to bring a new perspective into the Multimedia data acquisition, compression and representation, the Compressive sensing theory and its application to Multimedia data is currently one of our most prominent research topic. + more <h3 id="l2naslov"> Compressive Sensing </h3> <p id="l2text"> In order to bring a new perspective into the Multimedia data acquisition, compression and representation, the Compressive sensing theory and its application to Multimedia data is currently one of our most prominent research topic. The compressive sensing represents an alternative to the standard signal acquisition and processing methods, which is based on the fact that the signal under certain assumptions can be reconstructed from far lower number of random samples than it is required by the Shannon-Nyquist sampling theorem. It has been shown that the compressive sensing can be successfully applied to reconstruct images and audio signals from a small number of random measurements. We develop and improve mathematical algorithms for solving the compressive sensing optimization problems, as well as the applications of compressed sensing in various domains. </p>

Digital Watermarking

During the last decade digital watermarking has become an active research area focused on digital data protection. The modern multimedia systems require powerful data protection algorithms. + more <h3 id="l3naslov"> Digital Watermarking </h3> <p id="l3text"> During the last decade digital watermarking has become an active research area focused on digital data protection. The modern multimedia systems require powerful data protection algorithms. Due to the advances in the development of digital data and the modern way of communication, a number of watermarking procedure has been proposed. The watermarking purposes are classified as: ownership protection, protection and proof of copyrights, data authenticity protection, tracking of digital copies, copy and access control. Our research results cover several approaches and algorithms for image and audio watermarking. As an advanced level, the recently developed combined time-frequency watermarking approaches are also considered. </p>

Digital Audio

As one of the basic types of Multimedia data, the audio and speech signals processing is practiced within the Lab. The basic properties of music and speech signals are analyzed, together with the concepts of human speech production and hearing system. + more <h3 id="l4naslov"> Digital Audio </h3> <p id="l4text"> As one of the basic types of Multimedia data, the audio and speech signals processing is practiced within the Lab. The basic properties of music and speech signals are analyzed, together with the concepts of human speech production and hearing system. The main focus is made on the compression algorithms (MUSICAM, MPEG Layer I, II and III, ASPEC) and masking based on the psychoacoustic model. The special purpose techniques for audio signals characterization are considered: time-frequency analysis of audio signals and singular value decomposition of audio signals, voice activity indicators, word endpoints detector. </p>

Digital Image

Different aspects of digital image processing are conducted within our research Lab as well as a part of our professional educational activities: basic mathematical concepts behind common arithmetical, geometrical transforms, filtering and compression. + more <h3 id="l4naslov"> Digital Image </h3> <p id="l4text"> Different aspects of digital image processing are conducted within our research Lab as well as a part of our professional educational activities: the basic mathematical concepts behind the common arithmetical and geometrical image transforms, different image filtering algorithms, image compression algorithms including DCT-based JPEG, progressive and hierarchical JPEG, wavelet-based JPEG2000 algorithm, Fractal image compression, edge detection, image segmentation and texture characterization algorithms. </p>

Digital Video

Video signals, as a specific type of multimedia data require sophisticated processing algorithms. Algorithms for compression of digital video signals are of great importance, not only for multimedia applications, but also for digital video transmission. + more <h3 id="l4naslov"> Digital Video </h3> <p id="l4text"> Video signals, as a specific type of multimedia data require sophisticated processing algorithms. Algorithms for compression of digital video signals are of great importance, not only for multimedia applications, but also for digital video transmission. Generally we focus on MPEG (MPEG-1, MPEG-2 and MPEG-4) and VCEG (H.261, H.263 and H.264) groups. As one of the newest standards, the H.264/MPEG-4 is a topic of extensive study: types of frames, pixel precision in motion estimation, prediction modes, etc. </p>

Storage and Transmission

Important educational segment of our activities is related to the storage and transmission possibilities for managing Multimedia data, with the special attention devoted to CD coding techniques. + more <h3 id="l4naslov"> Storage and Transmission </h3> <p id="l4text"> Important educational segment of our activities is related to the storage and transmission possibilities for managing Multimedia data, with the special attention devoted to CD coding techniques including interleaving, CRC, Reed-Solomon code and EFM. Additionally, dealing with the Fourier transform based realization of transmission concepts such as QPSK modulation and OFDM principles is included as well. </p>

Telemedicine

Telemedicine has been considered as a new and perspective research area which uses the advantages of multimedia systems to provide efficient medical services at the distance. + more <h3 id="l4naslov"> Telemedicine </h3> <p id="l4text"> Telemedicine has been considered as a new and perspective research area which uses the advantages of multimedia systems to provide efficient medical services at the distance. The future hospitals should provide health care services to patients all over the world using multimedia systems in the frame of telemedicine technologies. Signal and image acquisition, signal and image storage, signal and image display and processing are the major components of telemedicine. Aiming to promote the advantages of telemedicine to the multimedia signal processing community, we deals with different aspects of medical practice such as telenursing, teleradiology, telesurgery, telepharmacy, etc. </p>

Web Technologies

We also deal with the practical aspects of data transmission and communications, including a modern web design technologies and information systems design. + more <h3 id="l4naslov"> Web Technologies </h3> <p id="l4text"> We also deal with the practical aspects of data transmission and communications, including a modern web design technologies and information systems design. The multimedia communications include: different types of communications networks and their properties, the concepts of Internet, IP addressing in the frame of IPv4 and IPv6 protocols, transport and higher level protocols. </p>