Constrained position dependent intra prediction combination (PDPC)

An apparatus for encoding video data in a bitstream using an encoder comprising:

• (a) providing a bitstream indicating how a coding tree unit was partitioned into coding units according to a partitioning structure that allows nodes to be split according to a partitioning technique, where the partitioning technique allows a node to be partitioned with quadtree partitioning technique, where said partitioning technique allows nodes to be partitioned with binary partitioning that splits a node in half in either a horizontal direction or a vertical direction resulting in two blocks that together are the same size as child nodes;
• (b) wherein said bitstream is configured for parsing to generate at least one predictor based on an intra prediction mode signaled in the bitstream, the intra prediction mode selected from a plurality of intra prediction modes for calculating a prediction pixel P[x,y] at coordinate x,y for the coding unit, where at least one of said coding units is rectangular;
• (c) wherein the prediction pixel is calculated based upon a value where said value is determined based upon, a vertical pixel value being based upon at least one reconstructed pixel value of the next adjacent row above the coding unit, a horizontal pixel value being based upon at least one reconstructed pixel value of the next adjacent column left the coding unit, said vertical pixel value having an associated vertical weight, said horizontal pixel value having an associated horizontal weight, a summation of (i) said vertical pixel value multiplied by said vertical weight (ii) said horizontal pixel value multiplied by said horizontal weight, (iii) an adjustment value based upon said vertical weight and said horizontal weight, and a value based upon said summation shifted by a bit shift operation to the right;
• (d) wherein the calculation is based upon reconstructed pixels of one or more above neighboring blocks and reconstructed pixels of one or more left neighboring blocks as the predictions for the pixels within the coding unit.

A computer readable storage device storing a bitstream of compressed video data for decoding by a decoder, the bitstream comprising:

• (a) said bitstream indicating how a coding tree unit was partitioned into coding units according to a partitioning structure that allows nodes to be split according to a partitioning technique, where the partitioning technique allows a node to be partitioned with quadtree partitioning technique, where said partitioning technique allows nodes to be partitioned with binary partitioning that splits a node in half in either a horizontal direction or a vertical direction resulting in two blocks that together are the same size as child nodes;
• (b) said bitstream configured for parsing to generate at least one predictor based on an intra prediction mode signaled in the bitstream, the intra prediction mode selected from a plurality of intra prediction modes for calculating a prediction pixel P[x,y] at coordinate x,y for the coding unit, where at least one of said coding units is rectangular;
• (c) wherein the prediction pixel is calculated based upon a value where said value is determined based upon, a vertical pixel value being based upon at least one reconstructed pixel value of the next adjacent row above the coding unit, a horizontal pixel value being based upon at least one reconstructed pixel value of the next adjacent column left the coding unit, said vertical pixel value having an associated vertical weight, said horizontal pixel value having an associated horizontal weight, a summation of (i) said vertical pixel value multiplied by said vertical weight (ii) said horizontal pixel value multiplied by said horizontal weight, (iii) an adjustment value based upon said vertical weight and said horizontal weight, and a value based upon said summation shifted by a bit shift operation to the right;
• (d) wherein the calculation is based upon reconstructed pixels of one or more above neighboring blocks and reconstructed pixels of one or more left neighboring blocks as the predictions for the pixels within the coding unit.