	US 11,778,226 B2
	Storage of motion information for affine mode
Kai Zhang, San Diego, CA (US); Li 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 Apr. 22, 2021, as Appl. No. 17/237,402.
Application 17/237,402 is a continuation of application No. PCT/IB2019/058991, filed on Oct. 22, 2019.
Claims priority of application No. PCT/CN2018/111176 (WO), filed on Oct. 22, 2018.
Prior Publication US 2021/0243467 A1, Aug. 5, 2021
Int. Cl. H04N 19/52 (2014.01); H04N 19/176 (2014.01); H04N 19/184 (2014.01)

CPC H04N 19/52 (2014.11) [H04N 19/176 (2014.11); H04N 19/184 (2014.11)]

20 Claims

1. A method of processing video data, comprising:

selecting, during a current affine calculation step in a conversion between a current block and a bitstream of the current block, one or more parameters of a set of affine model parameters;

clipping the one or more parameters,

wherein, when one of the one or more parameters, X, is stored with K bits, then X is clipped to Clip3(−2^K-1, 2^K-1−1, X), and wherein K is an integer greater than one;

storing, subsequent to the clipping, the one or more parameters for the current block; and

performing, based on the one or more parameters, the conversion between the current block and the bitstream of the current block,

wherein the one or more parameters are selected depending on at least one of: an inter mode, a merge mode, a block size, or a picture type.