Compressed Domain Spatial Adaptation of H264 Videos

Title: Compressed Domain Spatial Adaptation of H264 Videos
Authors: Shahabuddin, Sharmeen
Date: 2010
Abstract: A gigantic amount of multimedia contents is readily available for an ever growing consumer base at present due to advances in video coding technology and standardization along with rapid improvements of storage capacity and computing power. However, today's pervasive media environment which includes heterogeneous terminals and networks presents a serious obstacle in achieving seamless access to these contents. Storing individual content in several formats taking into account a wide variety of possible user preferences and resource constraints or adapting the content on the fly by cascaded decoding/re-encoding is not at all suitable for real-time applications. In this thesis, an innovative spatial adaptation technique for H.264/AVC videos is presented that adapts videos in the compressed domain without decoding/re-encoding them. The proposed adaptation strategy encodes each video frame into several slices according to the proposed slicing strategies. The adaptation process can reduce video size by cropping individual frames by dropping the undesired slices prior to transmitting that video to the clients. In order to ensure codec independence, structured metadata-based adaptation utilizing MPEG21 generic Bitstream Syntax Description (gBSD) is used to perform adaptation operations. The adaptation process is completely transparent to the client as the adapted video-stream is H.264 standard compliant. A prototype is developed for the proposed scheme. The performance results of the prototype are presented in this thesis. The results show that the proposed spatial adaptation scheme is very suitable and effective for adaptation of both pre-recorded and live video streams.
CollectionTh├Ęses, 1910 - 2010 // Theses, 1910 - 2010
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