The sum of squared differences(SSD) is used as the distortion metric for inter mode decision in traditional audio video coding standard(AVS) rate distortion optimization(RDO),but it is not consistent with human vision system(HVS) quite well after a lot of investigations.Compared with the other methods,the structural similarity(SSIM) proposed recently for assessing image quality accords with HVS much more well.Therefore,in order to improve coding efficiency,the SSIM is introduced into Lagrangian ...