Directional samples reordering for intra residual transform

In this paper, a directional samples reordering (DSR) based algorithm was proposed for intra residual data transform. To make the residual more suitable for discrete cosine transform, the diagonal edge in arbitrary size of intra prediction block can be rotated to a regular horizontal edge by reordering the samples in the block. The intra residual data will be used to implement 2D discrete cosine transform after DSR procedure. Experimental results show that up to 0.5967 dB and on average 0.4372 dB gain can be achieved for CIF sequence in high bitrate with the proposed algorithm at high complexity mode than H.264 intra coding.