Transmission of low-bit-rate MPEG-4 video signals over wireless channels
Adam, Evangelos A.
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The objective of this thesis is to study the performance of the MPEG-4 video coding standard in the presence of highly erroneous media, such as a wireless channel. MPEG-4 treats video sequences as a collection of objects rather than a collection of frames. A Matlab encoder that conforms to this approach is built for compressing raw video signals at various compression rates. A two-state Markov channel was used to simulate a wireless channel that introduces errors in the video bitstream and a decoder that utilizes error concealment techniques to hide these errors from the user was used to reconstruct the video sequence. The error resilient tools that the MPEG-4 standard provides to enhance the robustness in the presence of errors were simulated and proven to be advantageous compared to methods used in previous standards (MPEG-2, H.263, etc.). At the decoder, the use of error concealment techniques significantly enhanced the quality of the reconstructed video in high bit error rate environments.
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