JVET-AC0108 Non-EE2: Extend search area in Intra Template Matching Prediction (IntraTMP) [J.-Y. Huo, H.-Q. Du, H.-L. Zhang, Z.-Y. Zhang, W.-H. Qiao, Y.-Z. Ma, F.-Z. Yang (Xidian Univ.)]

In ECM7.0, IntraTMP uses the template to search the most similar template in predefined search area and uses its corresponding reference block as the prediction block. IntraTMP divides the search area into four rectangular regions, i.e. R1, R2 , R3, and R4. This contribution proposes to modify two of the four rectangular regions which lets the adjacent neighbouring region of the coding block being checked. On top of ECM-7.0, simulation results are reported as follows:

AI(Y/U/V): -0.13%/-0.13%/-0.18%, EncT 100%, DecT 100%

RA(Y/U/V): -0.xx%/-0.xx%/-0.xx%, EncT xx%, DecT xx%

The number of comparisons in search is slightly increased by the modification.

It was asked why the encoding time is largely varying over classes. Proponents express that the measurement was unreliable.

This proposal is asserted to give gain that could be additive with other IntraTMP proposals.

It was agreed to investigate this in an EE. JVET-AC0068 also enlarges the search range, should be investigated together.