By Wu F.
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Extra info for Advances in visual data compression and communication
MPEG-2 also defines a method of temporal scalability, which allows prediction of additional inserted pictures either from the base layer sequence or from an enhancement layer sequence. 4 MPEG-4 MPEG-4 is an innovative video standard. It tries to make a breakthrough on the hybrid video coding framework by considering video contents. The most famous concept introduced by MPEG-4 is object-based coding, although it has never been adopted by the industry. MPEG-1 and MPEG-2 are only able to encode rectangular video pictures.
So it is called hybrid video coding. The temporal redundancies among video frames are exploited by motion estimation (ME) and motion compensation (MC). In the hybrid coding framework, every coded picture has to be reconstructed at both the encoder and the decoder. Furthermore, the reconstructed picture is required to be exactly the same at both the encoder and the decoder. It is an important assumption in hybrid video coding. 1 will find the most matched block in the reconstructed picture and record the motion vector (MV).
A rate distortion region for a source is the closure of the set of achievable rate distortion pairs (R, D). The rate distortion function R(D) is the infimum of rates R such that (R, D) is in the rate distortion region of the source for a given distortion D. The distortion rate function D(R) is the infimum of all distortions D such that (R, D) is in the rate distortion region of the source for a given rate R. 2. d. source Sn with distribution p(sn ) and bounded distortion function d(sn , sˆn ) is equal to the associated information rate distortion function.
Advances in visual data compression and communication by Wu F.