We present a novel error-concealment method for MPEG-2 video decoders. Imperfect transmission of block-based compressed images may result in the loss of blocks, degrading the quality of the received video signal. Since an I-picture is used as a reference picture for forward and backward predictions of neighbouring pictures, transmission errors in an I-picture are propagated both spatially in th...

During the online edition of video material for television over data networks a major concern is the accumulation of delay over the production chain. Before a video signal of a camera arrives at a remote studio to be edited live, it travels over video adapters and analog/digital converters to codecs which in turn compress the signal to comply with small bandwidth constraints. This technical pro...

Mobile Ad hoc NETworks (MANETs) are becoming more essential to wireless communications due to growing popularity of mobile devices. However, MANETs do not seem to effectively support multimedia applications and especially video transmission. In this work, we propose a cross-layer design that aims to improve the performance of video transmission using TCP Friendly Rate Control (TFRC). Our design...

A video communication system based on combined source-channel coding is proposed. The proposed system uses a hybrid subband video coder structure in combination with power-constrained channel-optimized vector quantization (PCCOVQ) to achieve eecient and robust transmission of the video signal over a channel with multidimensional PAM signaling. The error-sensitive side information parameters are...

FACULTY OF ENGINEERING, SCIENCE AND MATHEMATICS SCHOOL OF ELECTRONICS AND COMPUTER SCIENCE Doctor of Philosophy Irregular Variable Length Coding by Robert G. Maunder In this thesis, we introduce Irregular Variable Length Coding (IrVLC) and investigate its applications, characteristics and performance in the context of digital multimedia broadcast telecommunications. During IrVLC encoding, the m...

In this paper, a rate controller for a H.261 based video encoder is proposed. The rate controller adaptively chooses the optimal channel matched quantizer using a stochastic learning automaton. The automaton learns the channel characteristics based on a one bit feedback from the decoder. The rate control algorithm is shown to converge to the optimal choice of the quantizer very quickly for vari...

This work describes systems for detecting semantic categories present in news video. The multimedia data was processed in three ways: the audio signal was converted to a sequence of acoustic features, automatic speech recognition provided a word-level transcription, and image features were computed for selected frames of the video signal. Primary acoustic, speech, and vision systems were traine...

Rapid development in technology has facilitated easy access to data in various domains. Security has hence become a subject of major concern. The paper brings forth a novel approach to embed a robust visible and invisible watermark into video frames, such that the authenticity of the original signal is maintained. Through Digital watermarking scheme, additional information is embedded in the vi...

ABSTRACT: For analyzing non-linear and non-stationary signals Empirical Mode Decomposition (EMD) is introduced as an adaptive method like wavelet packet best basis decomposition. Huang et. al introduced the empirical mode decomposition (EMD) in signal processing in 1998. In this communication we investigated the performance of video denoising using bi-dimensional EMD along with wavelet threshol...