US 11,659,174 B2
Image encoding method/device, image decoding method/device and recording medium having bitstream stored therein
Joo Hee Moon, Seoul (KR); Dong Jae Won, Goyang-si (KR); and Sung Won Lim, Seoul (KR)
Assigned to Industry Academy Cooperation Foundation of Sejong University, Seoul (KR)
Filed by Industry Academy Cooperation Foundation of Sejong University, Seoul (KR)
Filed on Mar. 9, 2021, as Appl. No. 17/196,160.
Application 17/196,160 is a continuation of application No. 16/341,830, granted, now 10,979,709, previously published as PCT/KR2017/011215, filed on Oct. 12, 2017.
Claims priority of application No. 10-2016-0133756 (KR), filed on Oct. 14, 2016; and application No. 10-2017-0127941 (KR), filed on Sep. 29, 2017.
Prior Publication US 2021/0195191 A1, Jun. 24, 2021
Int. Cl. H04N 19/119 (2014.01); H04N 19/176 (2014.01); H04N 19/129 (2014.01); H04N 19/159 (2014.01); H04N 19/593 (2014.01); H04N 19/61 (2014.01)
CPC H04N 19/119 (2014.11) [H04N 19/129 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/593 (2014.11); H04N 19/61 (2014.11)] 11 Claims
OG exemplary drawing
1. A method of decoding an image, the method comprising:
determining a secondary transform performing area of a current transform block;
acquiring a current 1-D transform array using a plurality of transform coefficients of the second transform performing area;
performing secondary inverse-transform on the current 1-D transform array; and
performing primary inverse-transform on a primary transform performing area of the current transform block,
wherein the secondary transform performing area is determined based on a low frequency area in a left upper area of the current block, and the secondary inverse-transform is not performed on an area that is not the secondary transform performing area, and
the primary transform performing area is determined equal to an entire area of the current block.