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 decoder that receives a bitstream indicating how a coding tree unit was partitioned into coding units according to a partitioning structure that allows nodes to be split into coding units according to a partitioning structure that includes a rectangular coding unit, the decoder comprising:
at least one processor that decodes the coding tree units based upon said partitioning structure into coding units including said rectangular coding unit and a plane;
the plane determined by the at least one processor using (1) a first point on a first line and (2) a second point on a second line; where
the processor determines the first line using a first set of samples corresponding to side neighboring samples to one of the coding unit, and determines a second line using a second set of samples corresponding to top neighboring samples of one of the coding unit, where the first line is free from being based upon all of the second set of samples, wherein the second line is free from being based upon all of the first set of samples, and wherein the first line is different than the second line.
2. The decoder of claim 1 where the plane is determined based at least in part on at least one of (1) an intersection of the second line and a first samples plane formed in the z-axis direction through the first line and (2) an intersection of the first line and a second samples plane formed in the z-axis direction through the second line.
3. The decoder of claim 2 where the first line is determined based at least in part on application of a least squares method on the first set of samples.
4. The decoder of claim 3 where the second line is determined based at least in part on application of a least squares method on the second set of samples.
5. The decoder of claim 4 where the plane is determined based at least in part on the intersection of the second line and the first samples plane formed in the z-axis direction through the first line.
6. The decoder of claim 4 where the plane is determined based at least in part on the intersection of the first line and the second samples plane formed in the z-axis direction through the second line.
7. The decoder of claim 1 where the plane is determined based at least in part on an average of (1) said intersection of the second line and the first samples plane formed in the z-axis direction through the first line and (2) the intersection of the first line and the second samples plane formed in the z-axis direction through the second line.
8. The decoder of claim 7 where the first line is determined based at least in part on application of a least squares method on the first set of samples.
9. The decoder of claim 8 where the second line is determined based at least in part on application of a least squares method on the second set of samples.
10. The decoder of claim 9 wherein the coding unit includes entropy coding.