公开(公告)号：US20230140259A1

公开(公告)日：2023-05-04

申请号：US18053156

申请日：2022-11-07

Applicant: Huawei Technologies Co., Ltd.

Inventor： Yichuan WANG ,  Quanhe YU ,  Hu CHEN ,  Weiwei XU ,  Elena Alexandrovna ALSHINA

IPC: G06T5/00 ,  G06T3/40

Abstract: This application provides an image dynamic range processing method and apparatus. The method includes: obtaining a first coordinate value of a first interpolation point and a first coordinate value of a third interpolation point related to a first cubic spline curve; and determining, based on histogram information of a first luminance interval of a to-be-processed image, a first coordinate value of a second interpolation point related to the first cubic spline curve. The first luminance interval is an interval between the first coordinate value of the first interpolation point and the first coordinate value of the third interpolation point. The first coordinate value of the first interpolation point, the first coordinate value of the second interpolation point, and the first coordinate value of the third interpolation point are used to determine a function of the first cubic spline curve.

公开(公告)号：US20230042923A1

公开(公告)日：2023-02-09

申请号：US17976426

申请日：2022-10-28

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Weiwei XU ,  Quanhe YU ,  Hu CHEN ,  Yichuan WANG

IPC: H04N9/77 ,  G06T5/00

Abstract: A mapping curve parameter obtaining method and apparatus are described. The method includes obtaining a first mapping curve parameter set and first maximum target system display luminance, and obtaining a display luminance parameter set, where the display luminance parameter set includes maximum display luminance and/or minimum display luminance of a display device. The method also includes obtaining an adjustment coefficient set, where the adjustment coefficient set includes one or more adjustment coefficients, and the one or more adjustment coefficients correspond to one or more parameters in the first mapping curve parameter set. Furthermore, the method includes adjusting the one or more parameters in the first mapping curve parameter set based on the display luminance parameter set, the first maximum target system display luminance, and the adjustment coefficient set to obtain a second mapping curve parameter set, where the second mapping curve parameter set includes one or more adjusted parameters.

公开(公告)号：US20220256157A1

公开(公告)日：2022-08-11

申请号：US17721561

申请日：2022-04-15

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Weiwei XU ,  Quanhe YU ,  Hu CHEN ,  Elena Alexandrovna ALSHINA ,  Rafal MANTIUK

IPC: H04N19/126 ,  H04N19/186 ,  H04N19/136 ,  H04N19/172 ,  H04N19/189

Abstract: Embodiments of this application provide a method for processing image signal conversion, including: 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, where the dynamic range conversion model is: L ′ = F ⁡ ( L ) = a × ( p × L n ( k 1 × p - k 2 ) × L n + k 3 ) m + b , where L is the first value, L′ is the second value, and k1, k2, k3, a, b, m, n, and p are model parameters.

公开(公告)号：US20220237754A1

公开(公告)日：2022-07-28

申请号：US17721602

申请日：2022-04-15

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Quanhe YU ,  Weiwei XU ,  Hu CHEN ,  Dongsheng WU ,  Le YUAN

IPC: G06T5/00

Abstract: This application provides an image processing method, including: adaptively determining at least one interpolation point based on feature information or dynamic metadata of a to-be-processed image, and determining the at least one interpolation point and a modified spline curve that passes through the at least one interpolation point, where the modified spline curve includes at least one of a linear spline curve or a cubic spline curve; and performing tone mapping on the to-be-processed image based on a modified tone mapping curve, where the modified tone mapping curve includes at least a part of an initial tone mapping curve and the modified spline curve. According to the method provided in this application, the tone mapping curve can be adaptively modified based on a scene requirement, so that images in various scenes can have a good display effect.