AN ENCODING APPARATUS FOR SIGNALING AN EXTENSION DIRECTIONAL INTRA-PREDICTION MODE WITHIN A SET OF DIRECTIONAL INTRA-PREDICTION MODES

The invention relates to an encoding apparatus (100) for signaling an extension directional intra-prediction mode within a set of directional intra-prediction modes, the set of directional intra-prediction modes comprising predetermined directional intra-prediction modes and the extension directional intra-prediction mode. The encoding apparatus (100) comprises a mode mapping unit (101) configured to select a predetermined directional intra-prediction mode, the selected predetermined directional intra-prediction mode being associated with an intra mode index, and to map the extension directional intra-prediction mode onto the selected predetermined directional intra-prediction mode, a signaling unit (103) configured to generate a signaling indicator comprising at least one of the intra mode index and a flag value, an intra-prediction unit (105) configured to intra-predict pixel values of pixels of a rectangular video coding block on the basis of the extension directional intra-prediction mode for providing a predicted rectangular video coding block, and an encoding unit (107) configured to encode the rectangular video coding block on the basis of the predicted rectangular video coding block.