| 摘要 |
Scalable encoding of a digital image into a base layer and at least one enhancement layer comprises an up-sampling step providing at least one part of an enhancement layer (90b), based on a corresponding part of a lower layer (91b) (e.g. base layer) having a lower level than the enhancement layer, the area of said corresponding parts having a scale factor of 4p (p ¥1). The lower layer comprises at least one Largest Coding Unit (LCU) divisible into Q smaller Coding Units, said units being further divisible into K Prediction Units called lower Prediction Units. For a LCU of the lower layer not divided into smaller Coding Units, and having Prediction Units of different sizes, the corresponding portion of the enhancement layer is divided into K subdivisions having substantially equivalent proportions as the Prediction Units of different sizes. The K subdivisions may have the same orientation as the corresponding lower Prediction Units of different sizes. |
