| JCTVC-B039 [H. Yang, J, Zhou, H. Yu (Huawei)] Simplified MDDT (SMDDT) for intra prediction residual
Combined with the directional intra prediction technique in AVC, MDDT (Mode Dependent Directional Transform) has been proven to be an efficient tool to enhance the coding efficiency by exploiting the redundancy in the intra prediction residuals. Based on the symmetry among all intra prediction directions, the number of transform matrices can be significantly reduced by the proposed SMDDT (Simplified MDDT) while the coding performance is kept unchanged. We suggest that a joint intra prediction and transform TE/CE is established, and various joint directional prediction and transform techniques for intra coding can be studied together.
Use same transform matrices and scan orders for different directions, instead of 16 transform bases and 8 scan orders only 5 transform matrices and 3 scan orders are used
Roughly 0.1-0.3% bit rate decrease compared to the KLT MDDT.
Saves memory, but does not save computational power compared to the KLT MDDT.
However, the approach does require additional matrix transposition.
For training, CIF and 720p sequences outside of the test set were used.
Comparison againt the MDDT of TMuC would be necessary to assess advantages.
Recommendation: TE
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