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公开(公告)号：US11803948B2
公开(公告)日：2023-10-31
申请号：US17605557
申请日：2020-04-16
Applicant: Dolby Laboratories Licensing Corporation
Inventor： Robin Atkins , Jaclyn Anne Pytlarz , Elizabeth G. Pieri
IPC: G06T5/00 , G06T11/00 , G06T7/00 , G09G5/02 , G09G5/10 , G09G5/30 , H04N1/60 , H04N5/57 , H04N9/73 , H04N9/77 , H04N23/741
CPC classification number: G06T5/009 , G06T2207/10024 , G06T2207/20016 , G06T2207/20208
Abstract: Methods and systems for the display management of HDR video signals are presented. The mapping is based on tone mapping and color volume mapping which map an input signal with an input dynamic range and color volume to a target display with a target dynamic range and color volume. Both a global tone-mapping and precision-mapping methods using pyramid filtering are presented.
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公开(公告)号：US11785263B2
公开(公告)日：2023-10-10
申请号：US17992603
申请日：2022-11-22
Applicant: DOLBY LABORATORIES LICENSING CORPORATION
Inventor： Robin Atkins , Peng Yin , Taoran Lu , Jaclyn Anne Pytlarz
CPC classification number: H04N19/87 , H04N1/6058 , H04N19/46 , H04N19/85 , H04N19/98 , G09G2320/06 , G09G2340/06
Abstract: In a method to improve backwards compatibility when decoding high-dynamic range images coded in a wide color gamut (WCG) space which may not be compatible with legacy color spaces, hue and/or saturation values of images in an image database are computed for both a legacy color space (say, YCbCr-gamma) and a preferred WCG color space (say, IPT-PQ). Based on a cost function, a reshaped color space is computed so that the distance between the hue values in the legacy color space and rotated hue values in the preferred color space is minimized HDR images are coded in the reshaped color space. Legacy devices can still decode standard dynamic range images assuming they are coded in the legacy color space, while updated devices can use color reshaping information to decode HDR images in the preferred color space at full dynamic range.
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公开(公告)号：US11776099B2
公开(公告)日：2023-10-03
申请号：US17344843
申请日：2021-06-10
Applicant: Dolby Laboratories Licensing Corporation
Inventor： Robert Wanat , Robin Atkins , Anustup Kumar Atanu Choudhury , Scott Daly , Jaclyn Anne Pytlarz
CPC classification number: G06T7/0002 , G06T5/002 , G06T5/50 , G06T7/97 , G06T2207/10024 , G06T2207/20024 , G06T2207/20224 , G06T2207/30168
Abstract: Methods and systems for generating an image quality metric are described. A reference and a test image are first converted to the ITP color space. After calculating difference images ΔI, ΔT, and ΔP, using the color channels of the two images, the difference images are convolved with low pass filters, one for the I channel and one for the chroma channels (I or P). The image quality metric is computed as a function of the sum of squares of filtered ΔI, ΔT, and ΔP values. The chroma low-pass filter is designed to maximize matching the image quality metric with subjective results.
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公开(公告)号：US20230169930A1
公开(公告)日：2023-06-01
申请号：US17920115
申请日：2021-04-27
Applicant: Dolby Laboratories Licensing Corporation
Inventor： Jaclyn Anne Pytlarz
IPC: G09G3/34
CPC classification number: G09G3/3406 , G09G2320/0626 , G09G2360/16 , G09G2320/0646 , G09G2320/066 , G09G2320/0238
Abstract: Methods and systems to adjust differently brightness and contrast for dark and bright pictures on a display are provided. Given a tone-mapping curve mapping an input dynamic range to a display comprising a minimum and maximum display luminance value, the maximum display luminance value is lowered to an adjusted luminance value according to user defined parameters. The input dynamic range is tone-mapped to the display dynamic range using the adjusted luminance value. For brightness control, the tone mapped image is stretched linearly back to the maximum display luminance value. For contrast control, a gamma or power EOTF of the display is adjusted according to the adjusted luminance. For displays with global backlight control, the global backlight is adjusted only when contrast is adjusted.
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Patent Agency Ranking
公开(公告)号：US11570480B2
公开(公告)日：2023-01-31
申请号：US17234816
申请日：2021-04-20
Applicant: Dolby Laboratories Licensing Corporation
Inventor： Robin Atkins , Peng Yin , Taoran Lu , Jaclyn Anne Pytlarz
Abstract: In a method to improve backwards compatibility when decoding high-dynamic range images coded in a wide color gamut (WCG) space which may not be compatible with legacy color spaces, hue and/or saturation values of images in an image database are computed for both a legacy color space (say, YCbCr-gamma) and a preferred WCG color space (say, IPT-PQ). Based on a cost function, a reshaped color space is computed so that the distance between the hue values in the legacy color space and rotated hue values in the preferred color space is minimized HDR images are coded in the reshaped color space. Legacy devices can still decode standard dynamic range images assuming they are coded in the legacy color space, while updated devices can use color reshaping information to decode HDR images in the preferred color space at full dynamic range.
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公开(公告)号：US11019302B2
公开(公告)日：2021-05-25
申请号：US16650821
申请日：2018-09-27
Applicant: Dolby Laboratories Licensing Corporation
Inventor： Jaclyn Anne Pytlarz , Robin Atkins , Elizabeth G. Pieri , Alexandre Chapiro , Scott Daly
IPC: H04N7/01
Abstract: Methods for encoding and decoding high-dynamic range signals are presented. The signals are encoded in a high frame rate and are accompanied by frame-rate conversion metadata defining a preferred set of frame-rate down-conversion parameters, which are determined according to the maximum luminance of a target display, display playback priority modes, or judder control modes. A decoder uses the frame-rate conversion metadata to apply frame-rate down-conversion to the input high-frame-rate signal according to at least the maximum luminance of the target display and/or the characteristics of the signal itself. Frame-based and pixel-based frame-rate conversions, and judder models for judder control via metadata are also discussed.
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公开(公告)号：US20190304379A1
公开(公告)日：2019-10-03
申请号：US16345192
申请日：2017-12-20
Applicant: Dolby Laboratories Licensing Corporation
Inventor： Jaclyn Anne Pytlarz , Robin Atkins , Gopi Lakshminarayanan , Hariharan Ganapathy Kathirvelu
IPC: G09G3/34
Abstract: Methods are disclosed for ambient light-adaptive display management. Given an input image, image metadata, an ambient-light signal, and parameters characterizing a target display, a processor generates an ambient-light adjustment function which maps input luminance values in a reference viewing environment to output luminance values in a target viewing environment, wherein the target viewing environment is determined based on the ambient-light signal. The ambient-light adjustment function is applied to the input image and the input metadata to generate a virtual image and new metadata. A tone-mapping function based on the new metadata and target display parameters is applied to the virtual image to generate an output image. The parameters for the target display are computed based on the ambient-light signal, global dimming metadata, and the luminance characteristics of the target display.
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公开(公告)号：US09230338B2
公开(公告)日：2016-01-05
申请号：US14631950
申请日：2015-02-26
Applicant: Dolby Laboratories Licensing Corporation
Inventor： Timo Kunkel , Robin Atkins , Tao Chen , Samir N. Hulyalkar , Jaclyn Anne Pytlarz
CPC classification number: G06T7/408 , G06T5/00 , G06T11/60 , H04N5/44504 , H04N21/42653
Abstract: A method for merging graphics and high dynamic range video data is disclosed. In a video receiver, a display management process uses metadata to map input video data from a first dynamic range into the dynamic range of available graphics data. The remapped video signal is blended with the graphics data to generate a video composite signal. An inverse display management process uses the metadata to map the video composite signal to an output video signal with the first dynamic range. To alleviate perceptual tone-mapping jumps during video scene changes, a metadata transformer transforms the metadata to transformed so that on a television (TV) receiver metadata values transition smoothly between consecutive scenes. The TV receiver receives the output video signal and the transformed metadata to generate video data mapped to the dynamic range of the TV's display.
Abstract translation: 公开了一种用于合并图形和高动态范围视频数据的方法。 在视频接收机中，显示管理过程使用元数据将来自第一动态范围的输入视频数据映射到可用图形数据的动态范围。 重新映射的视频信号与图形数据混合以产生视频复合信号。 反向显示管理过程使用元数据将视频合成信号映射到具有第一动态范围的输出视频信号。 为了减轻视频场景变化期间的感知色调映射跳跃，元数据变换器将元数据转换为转换，使得在电视（TV）接收机上的元数据值在连续场景之间平滑地转换。 TV接收机接收输出视频信号和变换后的元数据，生成映射到TV显示器的动态范围的视频数据。
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公开(公告)号：US20150256860A1
公开(公告)日：2015-09-10
申请号：US14631950
申请日：2015-02-26
Applicant: Dolby Laboratories Licensing Corporation
Inventor： Timo Kunkel , Robin Atkins , Tao Chen , Samir N. Hulyalkar , Jaclyn Anne Pytlarz
IPC: H04N21/2365 , G06T11/60 , G06T7/40 , G06T5/00
CPC classification number: G06T7/408 , G06T5/00 , G06T11/60 , H04N5/44504 , H04N21/42653
Abstract: A method for merging graphics and high dynamic range video data is disclosed. In a video receiver, a display management process uses metadata to map input video data from a first dynamic range into the dynamic range of available graphics data. The remapped video signal is blended with the graphics data to generate a video composite signal. An inverse display management process uses the metadata to map the video composite signal to an output video signal with the first dynamic range. To alleviate perceptual tone-mapping jumps during video scene changes, a metadata transformer transforms the metadata to transformed so that on a television (TV) receiver metadata values transition smoothly between consecutive scenes. The TV receiver receives the output video signal and the transformed metadata to generate video data mapped to the dynamic range of the TV's display.
Abstract translation: 公开了一种用于合并图形和高动态范围视频数据的方法。 在视频接收机中，显示管理过程使用元数据将来自第一动态范围的输入视频数据映射到可用图形数据的动态范围。 重新映射的视频信号与图形数据混合以产生视频复合信号。 反向显示管理过程使用元数据将视频合成信号映射到具有第一动态范围的输出视频信号。 为了减轻视频场景变化期间的感知色调映射跳跃，元数据变换器将元数据转换为转换，使得在电视（TV）接收机上元数据值在连续场景之间平滑地转换。 TV接收机接收输出视频信号和变换后的元数据，生成映射到TV显示器的动态范围的视频数据。
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