US 12,010,301 B2
Systems and methods for performing intra prediction coding in video coding
Frank Bossen, Vancouver, WA (US)
Assigned to SHAR KABUSHIKI KAISHA, Sakai (JP)
Appl. No. 17/621,583
Filed by Sharp Kabushiki Kaisha, Sakai (JP)
PCT Filed Jun. 24, 2020, PCT No. PCT/JP2020/024852
§ 371(c)(1), (2) Date Dec. 21, 2021,
PCT Pub. No. WO2020/262470, PCT Pub. Date Dec. 30, 2020.
Claims priority of provisional application 62/868,276, filed on Jun. 28, 2019.
Claims priority of provisional application 62/865,661, filed on Jun. 24, 2019.
Prior Publication US 2022/0360774 A1, Nov. 10, 2022
Int. Cl. H04N 19/117 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/82 (2014.01)
CPC H04N 19/117 (2014.11) [H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/82 (2014.11)] 5 Claims
OG exemplary drawing
 
1. A method of coding video data, the method comprising:
deriving an intra prediction angle parameter specified by an intra prediction mode based on a mapping table;
deriving an inverse angle parameter by dividing 16,384 by the intra prediction angle parameter;
for a prediction mode included in a defined set of prediction modes in a range of 2 to 17, setting a value of a scale variable to:
Min(2,Log 2(nTbW)−Floor(Log 2(3*invAngle−2))+8), and
for a prediction mode included in a defined set of prediction modes in a range of 51 to 80, setting the value of the scale variable to:
Min(2,Log 2(nTbH)−Floor(Log 2(3*invAngle−2))+8),
where invAngle is the derived inverse angle, nTbW is a transform block width, and nTbH is a transform block height; and
performing a position-dependent intra prediction sample filtering process modifying prediction samples by using reference samples and weights based on the value of the scale variable.