抄録
Recerltly, the concept of object scalability that also takes the contents of pictures into account unlike conventional scalability, has been proposed in MPEG-4. Object scalability in MPEG-4, however, assumes a VOP which requires the definition of shapes, so that it is not applicable to conventional coding schemes such as MPEG-2. This paper proposes a method of object scalable coding that can be adopted in these conventional block-based coding schemes. This method is based on SNR scalability, and it realizes scalability by differently controlling quantization on prioritized and non-prioritized parts. The bit-stream is compatible with SNR scalability, and for the enhancement layer picture, a similar SN ratio to that in normal SNR scalability can be obtained.
