Simplification of mode dependent intra smoothing

A system for intra-frame prediction comprising:

• a memory device comprising a mode dependent Intra smoothing lookup table (MDIS LUT) and instructions;
• a processor coupled to the memory device that executes the instructions to:
• generates a respective filtered reference samples for each of a plurality of prediction unit (PU) blocks by applying a smoothing filter to the PU block;
• obtain filtering switch data for each of the PU blocks from the MDIS LUT based on a size and a prediction mode of the PU block, wherein the filtering switch data for PU blocks of size 8×8 and planar prediction mode indicates that an unfiltered reference sample should be used;
• select, for each of the PU blocks, one of the filtered reference sample for the PU block or an unfiltered reference sample for the PU block based on the filtering switch data for the PU block;
• and
• perform intra-frame prediction based on the selected samples, wherein a Bjontegaard Distortion rate that results from performing the prediction is approximately 0.00% change on luma (Y), approximately 0.02% gain on blue-difference chroma (Cb), approximately 0.01% gain on red-difference chroma (Cr) for the high efficiency case and approximately 0.05% loss on luma (Y), approximately 0.03% gain on blue-difference chroma (Cb), and approximately 0.02% loss on red-difference chroma (Cr) for the low complexity case.