US 11,949,868 B2
Method and device for selecting context model of quantization coefficient end flag bit
Ronggang Wang, Shenzhen (CN); Zhenyu Wang, Shenzhen (CN); and Wen Gao, Shenzhen (CN)
Assigned to PEKING UNIVERSITY SHENZHEN GRADUATE SCHOOL, Shenzhen (CN)
Appl. No. 17/422,297
Filed by PEKING UNIVERSITY SHENZHEN GRADUATE SCHOOL, Shenzhen (CN)
PCT Filed Mar. 7, 2019, PCT No. PCT/CN2019/077278
§ 371(c)(1), (2) Date Jul. 12, 2021,
PCT Pub. No. WO2020/172907, PCT Pub. Date Sep. 3, 2020.
Claims priority of application No. 201910145192.8 (CN), filed on Feb. 27, 2019.
Prior Publication US 2022/0078425 A1, Mar. 10, 2022
Int. Cl. H04N 7/12 (2006.01); H04N 19/105 (2014.01); H04N 19/124 (2014.01); H04N 19/129 (2014.01); H04N 19/176 (2014.01); H04N 19/61 (2014.01); H04N 19/80 (2014.01); H04N 19/86 (2014.01)
CPC H04N 19/124 (2014.11) [H04N 19/105 (2014.11); H04N 19/129 (2014.11); H04N 19/176 (2014.11); H04N 19/61 (2014.11); H04N 19/80 (2014.11); H04N 19/86 (2014.11)] 13 Claims
OG exemplary drawing
 
1. A method for selecting a context model of a quantized coefficient end flag, comprising:
obtaining a scanning position POS of a non-zero coefficient corresponding to current quantized coefficient end flag in a specific scanning order; wherein the scanning position POS is a subscript of the non-zero coefficient in the scanning order;
configuring a first context model array, and using a fixed value as the base to calculate the logarithmic value of the value of the scanning position POS plus 1, and according to the logarithmic value, selecting a first context model from the first context model array; and using the first context model to encode or decode a binary symbol of the current quantized coefficient end flag.