Controlador dinâmico de energia para o codificador HEVC baseado em frentes de pareto

Abstract

Nowadays, the manipulation of digital videos represents an important research challenge. The fast increase on the demand for higher resolutions and performance leads to the development of the next-generation video coding standard, the High Efficiency Video Coding (HEVC). The HEVC became the new state of the art and brings many innovations as a way to improve the coding efficiency. However, the improvement on performance also brought higher computational effort (complexity) and energy consumption. Commonly, the videos are handled by embedded systems, which are dedicated systems that have a restricted functionality to meet a specific task, and are, typically, portable and battery powered. Onboard computers, digital cameras and drones are examples of embedded systems. This way, the balance between memory usage, video quality, performance and energy consumption is strongly desirable. Thereby, the usage of energy control techniques is mandatory, once such control allows the adaption of the energy consumption according to the system availability and data behavior. This work presents the development of a dynamic energy controller for the HEVC video coding standard based on Pareto Fronts and supported by an analysis that relates energy consumption to coding parameters variation, using the RAPL (Running Average Power Limit) tool. The developed controller allows adapting the encoder to 20% of its original energy consumption, and, for a 30% energy consumption reduction, presents around 5% increase on bit-rate.