Optimizing the Lagrange multiplier in perceptually-friendly high efficiency video coding for mobile applications
In mobile applications, the amount of memory and bandwidth is restricted. Efficient compression of video is essential to provide better quality streaming on a mobile device. High efficiency video coding (HEVC) standard provide substantial bitrate savings compared with the previous standards. The compression efficiency of HEVC has been improved by integration of a perceptual video quality metric inside the encoder. In the rate distortion optimization process, PSNR-HVS has been used to measure distortion for the coding unit mode selection. In this paper, we find the optimal Lagrange multiplier based on the quantization parameter. Experimental results for various test sequences show the compression efficiency of the perceptual HEVC will be improved by finding the optimal Lagrange multiplier.