Abstract
Rate control plays an important role in the rapid development of high-fidelity video services. As the High Efficiency Video Coding (HEVC) standard has been finalized, many rate control algorithms are being developed to promote its commercial use. The HEVC encoder adopts a new R-lambda based rate control model to reduce the bit estimation error. However, the R-lambda model fails to consider the frame-content complexity that ultimately degrades the performance of the bit rate control. In this letter, a gradient based R-lambda (GRL) model is proposed for the intra frame rate control, where the gradient can effectively measure the frame-content complexity and enhance the performance of the traditional R-lambda method. In addition, a new coding tree unit (CTU) level bit allocation method is developed. The simulation results show that the proposed GRL method can reduce the bit estimation error and improve the video quality in HEVC all intra frame coding.
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