Recent developments in perceptual video coding

Video coding plays a more and more important role when vast amount of multimedia data are emerging. Traditional video compression methods take into account the statistical redundancy among pixels when encoding videos. Since the human eyes are the ultimate receivers of visual information, considering the perception of the human visual system (HVS) may help to reach higher compression ratio. Perceptual video coding, which aims to remove the perceptual redundancy of encoded videos, has attracted more and more awareness. In this paper, recent developments in perceptual video coding are reviewed, The current perceptual-based approaches are classified into five categories, each with the principle of the methods, the applications as well as the problems. Key-issues are then discussed, which indicate that there remains much potential to exploit in perceptual video coding.