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MPEG video coding with adaptive motion compensation and bit allocation based on perception criteria

University of British Columbia

Picture quality and bandwidth are the two most important issues in digital video communications. A new method that guarantees consistent picture quality throughout each frame and each group of pictures (GOP) and also improves encoding efficiency of all versions of MPEG standard is proposed in this thesis. Addressing the bandwidth problem, we develop a unique Frame Partitioning technique that significantly improves the exploitation of temporal redundancies amongst video frames. This new technique works is used to modify the standard MPEG motion compensation strategy to allow for different temporal resolution within a single frame, thus improvinl compression. To further improve picture quality, we propose an original bit allocation and rate control algorithm complementing our motion compensation technique. We base our approach to bit allocation on macroblock distortion measurements, ensuring the consistency of quality on a frame and a GOP level. For the same picture quality, frame partitioning alone yields an additional increase of up to 20 percent or more in the encoding efficiency. Within a single frame, the use of our bit allocation and rate control algorithm can decreases the fluctuations in picture quality by as much as 70 percent. The combination of both techniques proposed in this thesis, allows an even greater improvement in either overall visual quality or bandwidth.

Thesis/Dissertation

application/pdf

2009-05-28

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http://hdl.handle.net/2429/8422

Electrical and Computer Engineering

University of British Columbia

UBCV

DSpace