Firstly, the principle and implementation of temporal Scalability, spatial Scalability, SNR Coarse-grain Scalability (CGS) and SNR Fine-grain Scalability (FGS) Video Coding are introduced in detail.

首先，详细介绍了它支持的时域、空域、SNR粗粒度可分级(CGS)和SNR精细粒度可分级(FGS)编码的原理和实现；最后，对视频可分级编码技术的应用前景进行了总结。

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