US 12,137,236 B2
Encoder, decoder, encoding method, and decoding method
Virginie Drugeon, Darmstadt (DE); Tadamasa Toma, Osaka (JP); Takahiro Nishi, Nara (JP); Kiyofumi Abe, Osaka (JP); and Ryuichi Kanoh, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA, Torrance, CA (US)
Filed by Panasonic Intellectual Property Corporation of America, Torrance, CA (US)
Filed on Aug. 21, 2023, as Appl. No. 18/235,960.
Application 18/235,960 is a continuation of application No. 17/825,061, filed on May 26, 2022, granted, now 11,778,207.
Application 17/825,061 is a continuation of application No. 16/902,559, filed on Jun. 16, 2020, granted, now 11,375,214, issued on Jun. 28, 2022.
Application 16/902,559 is a continuation of application No. PCT/JP2018/045835, filed on Dec. 13, 2018.
Claims priority of provisional application 62/607,047, filed on Dec. 18, 2017.
Prior Publication US 2023/0403402 A1, Dec. 14, 2023
Int. Cl. H04N 19/189 (2014.01); H04N 19/105 (2014.01); H04N 19/132 (2014.01); H04N 19/159 (2014.01); H04N 19/182 (2014.01)
CPC H04N 19/189 (2014.11) [H04N 19/105 (2014.11); H04N 19/132 (2014.11); H04N 19/159 (2014.11); H04N 19/182 (2014.11)] 1 Claim
OG exemplary drawing
 
1. A non-transitory computer readable medium storing a bitstream, the bitstream including an encoded signal and syntax information according to which a decoder performs a method comprising:
deriving a one-dimensional array of a plurality of reference samples for intra prediction by projecting a value of at least one first decoded pixel located on a first line onto a second line to derive the one-dimensional array of the plurality of reference samples, the second line being perpendicular to the first line and including values of a plurality of second decoded pixels, and the plurality of reference samples of the one-dimensional array being located on the second line and including the value of the at least one first decoded pixel projected on the second line and the values of the plurality of second decoded pixels;
after deriving the one-dimensional array of the plurality of reference samples, performing smoothing on the derived one-dimensional array of the plurality of reference samples; and
after performing smoothing on the derived one-dimensional array of the plurality of reference samples, generating a prediction image using the plurality of reference samples upon which the smoothing has been performed,
wherein the smoothing on the derived one-dimensional array of the plurality of reference samples is performed according to the following:
smoothed_ref[x]=(ref[x−1]+2+ref[x]+ref[x+1])>>2,
where ref[x] is a reference sample at index x from among the derived one-dimensional array of the plurality of reference samples not including the minimum value of the indexes of the derived one-dimensional array of the plurality of reference samples and the maximum value of the indexes of the derived one-dimensional array of the plurality of reference samples, and
where smoothed_ref[x] is a smoothed reference sample at index x from among the plurality of reference samples upon which the smoothing has been performed.