Enhanced inter prediction with localized weighted prediction in HEVC

Inter prediction plays an important role in most video encoding systems since it could significantly improve coding performance. The more accurate the prediction of the current block, the smaller the residual, and the higher coding efficiency could be achieved accordingly. In this paper, a localized weighted prediction method is proposed to improve inter prediction accuracy. The linear regression improvement model is employed to modify the prediction pixel values. The weighting parameters are estimated in both encoder and decoder, no additional bits are required to be transmitted. The proposed method shows better coding performance than previous methods, including the explicit weighted prediction method in High Efficiency Video Coding (HEVC). Experimental results show that the BD bit rate saving of the proposed method is up to 7.4% compared to HM12.0, while the decoding complexity is almost the same.