US 12,225,230 B2
Image prediction method and apparatus for performing intra prediction
Sunmi Yoo, Seoul (KR); and Jin Heo, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Oct. 31, 2023, as Appl. No. 18/385,897.
Application 18/385,897 is a continuation of application No. 17/876,402, filed on Jul. 28, 2022, granted, now 11,843,801.
Application 17/876,402 is a continuation of application No. 17/276,026, granted, now 11,445,216, previously published as PCT/KR2019/011913, filed on Sep. 16, 2019.
Claims priority of provisional application 62/731,143, filed on Sep. 14, 2018.
Prior Publication US 2024/0073451 A1, Feb. 29, 2024
Int. Cl. H04N 19/593 (2014.01); H04N 19/11 (2014.01); H04N 19/117 (2014.01); H04N 19/132 (2014.01); H04N 19/136 (2014.01); H04N 19/176 (2014.01)
CPC H04N 19/593 (2014.11) [H04N 19/11 (2014.11); H04N 19/117 (2014.11); H04N 19/132 (2014.11); H04N 19/136 (2014.11); H04N 19/176 (2014.11)] 9 Claims
OG exemplary drawing
 
1. A decoding apparatus for an image decoding, the decoding apparatus comprising:
a memory; and
at least one processor connected to the memory, the at least one processor configured to:
derive an intra prediction mode for a current block;
derive reference samples contiguous to the current block;
generate a prediction sample for the current block based on the intra prediction mode and the reference samples; and
generate a reconstructed picture for the current block based on the prediction sample,
wherein the generating of the prediction sample for the current block includes:
deriving an interpolation filter to be applied to the reference samples based on a prediction mode of the current block or a size of the current block; and
generating the prediction sample by applying the derived interpolation filter to the reference samples,
wherein the deriving of the interpolation filter includes:
comparing a distance between the prediction sample and the reference samples with a predetermined threshold value; and
deriving the interpolation filter as a Gaussian filter based on the distance exceeding the predetermined threshold value or as a cubic filter based on the distance being less than or equal to the predetermined threshold value,
wherein the distance is derived based on the prediction mode of the current block, and the predetermined threshold value is derived based on the size of the current block.