LOW BIT-RATE VIDEO CODING USING
Soonho Song, Gunho Lee, Sanghoon Sull, Sung-Jea Ko · 2000
Most discrete cosine transform (DCT) based video coding suffer from blocking artifacts where boundaries of 8 X 8 DCT blocks become visible on decoded images. The blocking artifacts become more prominent as the bit rate is lowered. In this paper, we present a new dequantization technique for discrete cosine transform (DCT) based encoding to sharply reduce the blocking artifacts. Our proposed dequantization scheme, through regularization, sharply reduces blocking artifacts in decoded images. The performance the proposed algorithm is compared to that of the currently specified H.263+ Annex J deblocking filter. The comparison will show visual improvements as well as numerical improvements in terms of the peak-signal-to-noise ratio (PSNR) and the blockiness measure (BM) to be defined.