System and method for constructing a plane for planar prediction
A system and method of defining a plane for planar coding in JVET in which first and second lines can be defined based upon pixels in left-adjacent and top-adjacent coding units. In some embodiments, the least squares method can be employed to define the relevant lines. One point along each of the lines can then be identified and the y-intercepts of the two lines can be averaged to obtain a third point. The three points can then be used to identify and define a plane for planar coding in JVET.
1. A method for encoding a bitstream by an encoder comprising one or more processors, the method comprising:
providing said bitstream indicating how a coding tree unit is partitioned into coding units according to a partitioning structure that allows nodes to be split according to a partitioning technique;
selecting a first set of pixels corresponding to side neighboring pixels to said coding unit;
selecting a second set of pixels corresponding to top neighboring pixels of said coding unit;
determining a first line based at least in part on said first set of pixels;
determining a second line based at least in part on said second set of pixels, wherein said first line is free from being based upon all of said second set of pixels, wherein said second line is free from being based upon all of said first set of pixels, and wherein said first line is different than said second line;
determining a plane based at least in part on (1) a first point on said first line, (2) a second point on said second line, and (3) a third point based upon at least one of said first line and said second line;
encoding said coding unit based upon pixels of said coding unit and said plane.
2. The method for encoding said bitstream by said encoder of claim 1 wherein said step of determining said plane is based at least in part on at least one of (1) an intersection of said second line and a first pixel plane formed in the z-axis direction through said first line and (1) an intersection of said first line and a second pixel plane formed in the z-axis direction through said second line.
3. The method for encoding said bitstream by said encoder of claim 2 wherein said step of determining said first line is based at least in part on application of the least squares method on said first set of pixels.
4. The method for encoding said bitstream by said encoder of claim 3 wherein said step of determining said second line is based at least in part on application of the least squares method on said second set of pixels.
5. The method for encoding said bitstream by said encoder of claim 4 wherein said step of determining said plane is based at least in part on said intersection of said second line and said first pixel plane formed in the z-axis direction through said first line.
6. The method for encoding said bitstream by said encoder of claim 4 wherein said step of determining said plane is based at least in part on said intersection of said first line and said second pixel plane formed in the z-axis direction through said second line.
7. The method for encoding said bitstream by said encoder of claim 1 wherein said step of determining said plane is based at least in part on an average of (1) said intersection of said second line and said first pixel plane formed in the z-axis direction through said first line and (1) said intersection of said first line and said second pixel plane formed in the z-axis direction through said second line.
8. The method for encoding said bitstream by said encoder of claim 7 wherein said step of determining said first line is based at least in part on application of the least squares method on said first set of pixels.
9. The method for encoding said bitstream by said encoder of claim 8 wherein said step of determining said second line is based at least in part on application of the least squares method on said second set of pixels.
10. The method for encoding said bitstream by said encoder of claim 9 wherein said encoding said coding unit includes entropy coding.