標題: Scalable Video Coding Shown to be State of the Art [打印本頁] 作者: masonchung 時間: 2008-3-17 11:00 PM 標題: Scalable Video Coding Shown to be State of the Art Scalable video coding (SVC) was developed by the Joint Video Team (JVT) of ISO/IEC MPEG &4 L8 P$ t4 @6 `+ [
ITU-T VCEG in a standardization project completed in October 2007. The SVC enhancement of A' T( S1 o' G# W3 d
the AVC core design includes the specification of three scalable profiles (the Scalable Baseline, . }, X2 P5 _/ `& _Scalable High, and Scalable High Intra profiles). It enables the construction of SVC bitstreams that) c$ i' c4 f4 r2 R8 H
contain reduced bit rate substreams. The substreams can be extracted from the complete bitstream, : ]) \; h& J' z1 Gthereby providing scalability in terms of bit rate, decoding complexity, and frame rate, spatial j, U' L: u! P: E/ a( X$ kresolution, or quality. In typical cases, one or more of the substreams of the SVC bitstream will be 2 I6 P0 i' S& f1 X& ^fully compatible with ordinary AVC decoders. Frame rate scalability (also known as temporal 2 J. U" d$ \8 w6 F5 V' kscalability) or spatial scalability refers to the presence of a substream with a lower sampling rate) S" T8 `# ~/ a
than the overall bitstream in terms of time or spatial resolution. Quality scalability refers to the / r% ?( \* @/ s; N0 j4 ipresence of a substream with the same sampling rate as the parent SVC stream, but having a lower" y" ^ U/ R8 L1 u
bit rate with a correspondingly lower quality.: H+ x/ a4 `3 ?& f1 d
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