US 12,284,350 B2
Method and apparatus for processing image signal conversion, and terminal device
Weiwei Xu, Hangzhou (CN); Quanhe Yu, Beijing (CN); Hu Chen, Munich (DE); Elena Alexandrovna Alshina, Munich (DE); and Rafal Mantiuk, Cambridge (GB)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed on Apr. 15, 2022, as Appl. No. 17/721,561.
Application 17/721,561 is a continuation of application No. PCT/CN2020/114136, filed on Sep. 9, 2020.
Claims priority of application No. 201910999368.6 (CN), filed on Oct. 18, 2019.
Prior Publication US 2022/0256157 A1, Aug. 11, 2022
Int. Cl. H04N 19/126 (2014.01); H04N 19/136 (2014.01); H04N 19/172 (2014.01); H04N 19/186 (2014.01); H04N 19/189 (2014.01)
CPC H04N 19/126 (2014.11) [H04N 19/136 (2014.11); H04N 19/172 (2014.11); H04N 19/186 (2014.11); H04N 19/189 (2014.11)] 17 Claims
OG exemplary drawing
 
1. A method for processing image signal conversion, the method comprising:
obtaining a primary color component of a to-be-processed pixel; and
converting a first value of the primary color component into a second value based on a preset dynamic range conversion model, wherein the dynamic range conversion model is:

OG Complex Work Unit Math
wherein
L is the first value, L is the second value, and k1, k2, k3, a, b, m, n, and p are model parameters, wherein
information about a source image signal comprises an average luminance value of pixels in a to-be-processed frame of the source image signal, and p is obtained according to the following formula:

OG Complex Work Unit Math
wherein
avgL is an average luminance value of the pixels in the to-be-processed frame of the source image signal that is obtained after normalization processing, TPH, TPL, pvalueH, and pvalueL are all preset values, 0≤TPL, TPH≤1, and go is a monotonically increasing function in an interval from 0 to 1.