The Joint Collaborative Team on Video Coding (jct-vc) of itu-t wp3/16 and iso/iec jtc 1/sc 29/wg 11 held its second meeting during 21-28 July, 2010 at the itu-t premises in Geneva, ch


JCTVC-B025 [Y. H. Tan, C. Yeo, Z. Li, S. Rahardja (I2R)] Intra-prediction with adaptive sub-sampling



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JCTVC-B025 [Y. H. Tan, C. Yeo, Z. Li, S. Rahardja (I2R)] Intra-prediction with adaptive sub-sampling

Intra-prediction improves coding performance by reducing inter-pixel redundancy. However, to accommodate the use of block transforms, not all pixels can be predicted from reconstructed pixels that are located close to themselves. This causes prediction performance to suffer as pixel values further apart are less correlated. This proposal presents additional intra-prediction modes designed with the goal of improving prediction performance. Experimental results show an average gain of about 2% when the new modes are incorporated in the current 8x8 prediction modes. Since the new coding modes (8x8) are designed with transform size smaller than coding block size, the modes can also be useful when the prediction unit is larger than the maximum transform size.

Interleaving of prediction blocks where a subset is first encoded and decoded to serve as a predictor for subsequent subsets. Subsampling methods are horizontal and vertical interleaving, and 4 adjacent blocks. Transform is applied on the subsets. Scheme was only implemented on 8x8 prediction units (could be done on larger units also). Currently only 4x4 transform is used. All other prediction modes are still used. Gain reported is 2% on average for intra (implementation based on KTA 2.6r1)

It was remarked that the scheme could be difficult to operate in pipeline systems, because each 4x4 preditiction unit must be reconstructed before the next can be predicted.

Further study was encouraged; this needs implementation for other block sizes before its merits can be assessed.


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