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公开(公告)号：US20240331117A1
公开(公告)日：2024-10-03
申请号：US18743607
申请日：2024-06-14
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Weiwei XU , Haitao YANG , Quanhe YU , Hu CHEN , Yichuan WANG
Abstract: A dynamic range mapping method and apparatus for a panoramic video that relate to the field of video image processing are provided. The method includes: splitting a two-dimensional panoramic projection image corresponding to any frame of three-dimensional panoramic image in a panoramic video, to obtain a plurality of regions of the two-dimensional panoramic projection image; obtaining metadata of the two-dimensional panoramic projection image, where the metadata includes metadata information elements separately corresponding to the plurality of regions, and a metadata information element corresponding to one region includes dynamic mapping information of the region; determining dynamic mapping information of each pixel in a current angle of view range based on respective dynamic mapping information of the plurality of regions; and performing dynamic range mapping on each pixel in the current angle of view range, to obtain a two-dimensional panoramic projection image that is used for display or subsequent processing.
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Patent Agency Ranking
公开(公告)号：US20230054046A1
公开(公告)日：2023-02-23
申请号：US17975893
申请日：2022-10-28
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Weiwei XU , Quanhe YU , Hu CHEN , Yichuan WANG
Abstract: This application provides a dynamic range mapping method and apparatus. The dynamic range mapping method includes: obtaining a display parameter of a terminal device; obtaining feature information of image data; obtaining a first parameter of a first tone mapping curve of the image data; when a preset condition is met, obtaining a second parameter of a second tone mapping curve based on the first parameter, the display parameter of the terminal device, and the feature information of the image data, where output luminance at a first point on the second tone mapping curve is not greater than input luminance at the first point on the second tone mapping curve; and performing dynamic range mapping on the image data based on the second parameter of the second tone mapping curve.
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公开(公告)号：US20240221136A1
公开(公告)日：2024-07-04
申请号：US18604784
申请日：2024-03-14
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Weiwei XU , Jinsong WEN , Lei WU , Zhongke MA , Yanbing JIA , Quanhe YU , Zizhong WANG , Yichuan WANG , Hu CHEN
CPC classification number: G06T5/92 , G06T7/11 , G06T2207/10016 , G06T2207/10024 , G06T2207/20208
Abstract: This application provides a tone mapping method including: obtaining a to-be-displayed image frame and metadata which includes at least one metadata information unit; segmenting the to-be-displayed image frame into a plurality of segmentation regions in a target segmentation manner, and determining a correspondence between the plurality of segmentation regions and the at least one metadata information unit; and for an ith pixel: determining, for a plurality of pixels included in a preset region, at least one related segmentation region to which the plurality of pixels belong, and determining a related metadata information unit corresponding to each related segmentation region; obtaining a tone mapping subvalue corresponding to the related segmentation region, and allocating a corresponding weighting factor to the related segmentation region; obtaining a tone mapping value based on the tone mapping subvalue and the weighting factor; and performing tone mapping based on the tone mapping value.
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公开(公告)号：US20240153051A1
公开(公告)日：2024-05-09
申请号：US18411529
申请日：2024-01-12
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Weiwei XU , Quanhe YU , Hu CHEN , Yichuan WANG
CPC classification number: G06T5/92 , G06T3/16 , G06T5/50 , G06T7/11 , G06T2207/10016 , G06T2207/20208
Abstract: This application provides a tone mapping method and apparatus for a panoramic image. The tone mapping method includes: determining one or more target metadata information units of a first pixel from a plurality of metadata information units, where the plurality of metadata information units are obtained by parsing a bitstream, the first pixel is any pixel in a to-be-processed panoramic video two-dimensional planar projection, the plurality of metadata information units correspond to a plurality of segmented regions included in a panoramic video three-dimensional spherical representation panoramic image, and there is a mapping relationship between the panoramic video two-dimensional planar projection and the panoramic video three-dimensional spherical representation panoramic image; and performing tone mapping on a pixel value of the first pixel based on the one or more target metadata information units, to obtain a target tone mapping value of the first pixel.
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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
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.
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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
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.
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