Compressed domain transcoding solutions for MPEG-4 visual simple profile and H.263 baseline videos in 3GPP services and applications

To provide basic video services and applications in 3G wireless networks, two video coding formats, H.263 baseline and MPEG-4 visual simple profile, are commonly adopted in different forms for various usage scenarios. To ensure interoperability between these cases, we propose efficient compressed domain algorithms for transcoding between MPEG-4 visual simple profile and H.263 baseline, and among MPEG-4 visual simple profile coding modes. Experimental results show that our suggested algorithms provide significant complexity reduction and quality improvement, in terms of PSNR, compared to the spatial domain approach. Being the first complete work on transcoding between all kinds of MPEG-4 visual simple profile and H.263 baseline bit streams, we believe this work provides valuable solutions for various 3GPP (3rd generation partnership project) compliant video services and applications).