US 11,930,173 B2
Transform parameter derivation based on block partition
Li Zhang, San Diego, CA (US); Kai Zhang, San Diego, CA (US); Hongbin Liu, Beijing (CN); and Yue Wang, Beijing (CN)
Assigned to BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD, Beijing (CN); and BYTEDANCE INC., Los Angeles, CA (US)
Filed by Beijing Bytedance Network Technology Co., Ltd., Beijing (CN); and Bytedance Inc., Los Angeles, CA (US)
Filed on Aug. 13, 2021, as Appl. No. 17/401,479.
Application 17/401,479 is a continuation of application No. PCT/CN2020/075562, filed on Feb. 17, 2020.
Claims priority of application No. PCT/CN2019/075170 (WO), filed on Feb. 15, 2019.
Prior Publication US 2021/0377531 A1, Dec. 2, 2021
Int. Cl. H04N 19/119 (2014.01); H04N 19/176 (2014.01); H04N 19/46 (2014.01); H04N 19/96 (2014.01)
CPC H04N 19/119 (2014.11) [H04N 19/176 (2014.11); H04N 19/46 (2014.11); H04N 19/96 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method of video processing, comprising:
splitting a first block of video into multiple child blocks which comprises a first child block, wherein at least one of a width (Wi) or a height (Hi) of a block size of the first child block is a non-power-of-two integer;
determining, for a conversion between the first child block and a bitstream representation of the first child block, transform parameters associated with a transform block for the first child block, wherein one or more of a width (TWi) and a height (THi) of a block size of the transform block being smaller than the width (Wi) and height (THi) of the first child block and at least one of the width (TWi) or the height (THi) is a power of two, and wherein settings of TWi and/or THi and/or transform matrices of the transform block depend on the block size of the first child block or available transform matrices, and wherein TWi is set to pow(2, floor(log 2(Wi)) and/or THi is set to pow(2, floor(log 2(Hi)), where floor (x) is a function that returns a greatest integer less than or equal to x, and where pow (x, y) is a function that returns y power of x; and
performing the conversion by using the transform parameters,
wherein the transform parameters include a fixed offset (OffsetX, OffsetY), which is applied to locate a top-left position within a region where transform is to be applied to with the transform parameters, where coordinates of a left-top corner of the first child block is (0, 0).