| JCTVC-B117 [P. Tao, D. Li, W. Wu, J. Wen (Tsinghua Univ.)] Intra prediction using localized horizontal spatial prediction (LATE)
This document proposed using localized horizontal spatial prediction in the intra block prediction. In the proposed algorithm, a region of size 32x16 is divided into two 16x16 MBs, consisting of the samples from the even-numbered columns and the odd-numbered columns (termed the even MB or EMB and the odd MB or OMB) respectively. The EMB is encoded using conventional intra coding techniques and then its reconstruction is used for the prediction of the OMB. Experimental results reportedly show that with CABAC coding, an average of 0.9% bit rate savings can reportedly be achieved for all sequences, with 1.2% for HD sequences for all-intra coding. Somewhat more gain was shown with CAVLC coding.
Similar in spirit to field coding, rotated. It was remarked that coding the data using one coded field followed by another coded field that uses inter prediction from the first field might actually work better.
Testing was in the JM (all-intra) context. Testing in the TMuC context seems desirable.
It was remarked that the upsampling filter would extend beyond the MB boundaries.
Division of 32x16 MB into two vertically interleaved blocks ("even MB and odd MB") EMB is intra coded, six-tap filter interpolation applied for prediction of OMB. Average BR reduction over classes A-D in all-intra coding is 2.9% for CAVLC coding and 0.9% for CABAC (1.2% for HD).
Further study – somewhat surprising that it gives (little) gain at all. Would that be transferable to TMuC? Further, how is the 6-tap upsampling filter working at the block boundaries? It should not use samples from neighbored MBs.
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