| 摘要 |
This disclosure describes techniques for coding an enhancement layer in a scalable video coding (SVC) scheme. The techniques involve run-length codin g of significant coefficients and refinement coefficients of the enhancement layer. Rather than performing two different run-length passes to separately code the significant coefficients and refinement coefficients, the techniqu es of this disclosure perform run-length coding of the significant coefficie nts and refinement coefficients together. Therefore, run values of the run-l ength coding codes the significant coefficients with the refinement coeffici ents. Additional techniques are also described, which can eliminate the need to send sign information for some of the refinement coefficients. Instead, this sign information for some of the refinement coefficients may be derived at the decoder based on the sign values of corresponding coefficients of pr eviously encoded layers of the SVC scheme, which can further improve compres sion efficiency. |
