JVET-AC0069 Non-EE2: Intra Template-Matching Prediction Fusion [L. Zhang, F. Wang, Y. Yu, H. Yu, D. Wang (OPPO)]

This contribution proposes an Intra Template-Matching Prediction fusion method that blends multiple matched blocks derived from intra template matching process. The proposed method is implemented on top of ECM-7.0 software, it shows coding performance gains as follows:

Test a (IntraTMP fusion with SAD-based weights):

AI { -0.15% Y, -0.16% U, -0.18% V, 100% EncT, 100% DecT }

RA {xx% Y, xx% U, xx% V, xx% EncT, xx% DecT }

Test b (IntraTMP fusion with fixed weights):

AI { -0.15 % Y, -0.18 % U, -0.29 % V, 100 % EncT, 101 % DecT }

RA {xx% Y, xx% U, xx% V, xx% EncT, xx% DecT }

Test c (IntraTMP fusion with SAD-based weights and enlarged search range):

AI {-0.28% Y, -0.33% U, -0.32% V, 104% EncT, 106% DecT }

RA {-0.10% Y, -0.10% U, -0.16% V, 101% EncT, 100% DecT }

This has the same modified search procedure as in JVET-AC0068 (which selects one candidate and signals by index). Here, no signalling is used and fusion is done with up to 3 candidates. It is determined by a threshold how many are used.

It was agreed to investigate this in an EE – see notes under JVET-AC0068.