In this proposal, modified horizontal and vertical planar prediction methods are suggested. Specifically, the additional two modes are considered as horizontal and vertical prediction modes during the reference sample construction and transform processes. In addition, a context-coded flag to indicate the direction between horizontal and vertical is bypass-coded. Further, the directional flag is inferred either horizontal planar or vertical planar mode based on the DIMD mode. If the DIMD first mode is less than 34, the intra mode of the current block is inferred to be a horizontal planar mode. Otherwise, the intra mode of the current block is set to be a vertical planar mode. The experimental results of the proposed methods are shown below: