Bit Allocation of LCU Layer Based on Visual Saliency for High Efficiency Video Coding

The LCU layer bit allocation strategy of High Efficiency Video Coding(HEVC) rate control algorithm does not consider the visual saliency of LCU. Aiming at this problem, this paper proposes a new calculation formula of LCU layer bit allocation weight. The formula takes into account both the visual saliency of LCU and the discrete cosine transform coefficients of the predicted residuals. In addition, according to the different rate distortion characteristics of different frames, this paper also adjusts the update of model parameters. The experimental results show that compared with the rate control algorithm of HM10.1 platform, the rate distortion performance of the proposed algorithm is improved by 1.88% on average, and the rate control accuracy is also higher.