2015/2016
Multi-Lambda Search for Improved Rate-Distortion Optimization of H.265/HEVC
2015 10th International Conference on Information, Communications and Signal Processing, ICICS 2015,
| 作者 | Sio-Kei Im
Ka-Hou Chan |
|---|---|
| 摘要 | Lagrangian Rate Distortion Optimization (RDO) is widely employed in modern video encoders such as H.265/HEVC for mode decision. For each encoding stage, this approach involves minimizing a cost, which is a function of rate, distortion and a multiplier called lambda. This paper explores multi-lambda search and its impact on RDO by using more than one value of lambda. Simulations show an average bit rate saving up to 13.0% can be achieved for the H.265/HEVC codec. Moreover, the extra added complexity is contained to a certain level and is also adjustable according the processing resources available. |