Improve H.264/AVC lossless coding by coefficients reordering

The Entropy coding module in the H.264/advanced video coding (AVC) standard was originally designed for lossy video coding and does not yield adequate performance for lossless video coding. In this paper, we analyze the problem with the current lossless coding scheme and therefore propose a Coefficients Reordering based method for H.264/AVC lossless coding. By reordering the position of zigzag-scanned coefficients, the resultant new sequence fits the H.264/AVC entropy coders better. Experimental results confirm that the proposed method achieves about 2.6% and 2.0% bit saving for intra and inter lossless coding compared with the current H.264/AVC fidelity range extensions high profile.