公开(公告)号：US11025961B2

公开(公告)日：2021-06-01

申请号：US16532924

申请日：2019-08-06

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Robin Atkins ,  Peng Yin ,  Taoran Lu ,  Jaclyn Anne Pytlarz

IPC: H04N19/87 ,  H04N19/46 ,  H04N19/98 ,  H04N19/85 ,  H04N1/60

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.

公开(公告)号：US10659790B2

公开(公告)日：2020-05-19

申请号：US16094201

申请日：2017-04-19

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Taoran Lu ,  Fangjun Pu ,  Peng Yin ,  Tao Chen

IPC: H04N19/149 ,  H04N19/124 ,  H04N19/186 ,  H04N19/115 ,  H04N19/12

Abstract: Methods to improve the quality of coding high-dynamic range (HDR) signals in the ICtCp color space are presented. Techniques are described to a) generate optimum chroma Offset and scaling parameters, b) compute chroma mode decisions by optimizing mode selection distortion metrics based on chroma saturation and hue angle values, and c) preserving iso-luminance by maintaining in-gamut values during chroma down-sampling and chroma up-sampling operations.

公开(公告)号：US10587897B2

公开(公告)日：2020-03-10

申请号：US15434699

申请日：2017-02-16

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Sheng Qu ,  Peng Yin ,  Yan Ye ,  Yuwen He ,  Walter Gish ,  Guan-Ming Su ,  Yufei Yuan ,  Samir Hulyalkar

IPC: H04N19/70 ,  H04N19/159 ,  H04N19/30 ,  H04N19/50 ,  H04N19/597 ,  H04N19/98 ,  H04L29/06

Abstract: Coding syntaxes in compliance with same or different VDR specifications may be signaled by upstream coding devices such as VDR encoders to downstream coding devices such as VDR decoders in a common vehicle in the form of RPU data units. VDR coding operations and operational parameters may be specified as sequence level, frame level, or partition level syntax elements in a coding syntax. Syntax elements in a coding syntax may be coded directly in one or more current RPU data units under a current RPU ID, predicted from other partitions/segments/ranges previously sent with the same current RPU ID, or predicted from other frame level or sequence level syntax elements previously sent with a previous RPU ID. A downstream device may perform decoding operations on multi-layered input image data based on received coding syntaxes to construct VDR images.

公开(公告)号：US10432977B2

公开(公告)日：2019-10-01

申请号：US15749231

申请日：2016-08-03

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Robin Atkins ,  Peng Yin ,  Taoran Lu ,  Jaclyn Anne Pytlarz

IPC: H04N19/46 ,  H04N1/60 ,  H04N19/87 ,  H04N19/85 ,  H04N19/98

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.

公开(公告)号：US10136133B2

公开(公告)日：2018-11-20

申请号：US14933679

申请日：2015-11-05

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Taoran Lu ,  Peng Yin ,  Tao Chen ,  Guan-Ming Su

IPC: H04N19/146 ,  H04N19/124 ,  H04N19/172 ,  H04N19/186 ,  H04N19/65 ,  H04N19/147 ,  H04N19/126 ,  H04N19/136

Abstract: A high dynamic range input video signal characterized by either a gamma-based or a perceptually-quantized (PQ) source electro-optical transfer function (EOTF) is to be compressed. Given a luminance range for an image-region in the input, for a gamma-coded input signal, a rate-control adaptation method in the encoder adjusts a region-based quantization parameter (QP) so that it increases in highlight regions and decreases in dark regions, otherwise, for a PQ-coded input, the region-based QP increases in the dark areas and decreases in the highlight areas.

公开(公告)号：US09936199B2

公开(公告)日：2018-04-03

申请号：US15513928

申请日：2015-09-24

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Jan Froehlich ,  Robin Atkins ,  Qiuwei Wang ,  Guan-Ming Su ,  Peng Yin

IPC: H04N19/186 ,  H04N19/124 ,  H04N9/67

CPC classification number: H04N19/124 ,  H04N9/67 ,  H04N9/68 ,  H04N19/186 ,  H04N19/60 ,  H04N19/85

Abstract: Compared to traditional gamma-coded video, perceptually quantized video provides greater flexibility for the transmission and display management of high-dynamic range video, but it does not compresses as efficiently using existing standard codecs. Techniques are described to improve the coding efficiency of perceptually coded video by applying a color cross-talk transformation after the RGB/XYZ to LMS transformation. Such a transform increases luma and chroma correlation for color appearance models, but improves perceptual uniformity and overall coding efficiency for wide color gamut, HDR, signals.

公开(公告)号：US09838705B2

公开(公告)日：2017-12-05

申请号：US15600338

申请日：2017-05-19

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Purvin Bibhas Pandit ,  Peng Yin ,  Dong Tian

IPC: H04N19/00 ,  H04N19/46 ,  H04N19/597 ,  H04N19/70 ,  H04N19/172 ,  H04N13/00 ,  H04N19/182 ,  H04N19/61

CPC classification number: H04N19/46 ,  H04N13/111 ,  H04N13/161 ,  H04N13/194 ,  H04N19/172 ,  H04N19/182 ,  H04N19/597 ,  H04N19/61 ,  H04N19/70 ,  H04N2213/003

Abstract: Implementations are provided that relate, for example, to view tiling in video encoding and decoding. A particular method includes accessing a video picture that includes multiple pictures combined into a single picture (826), accessing information indicating how the multiple pictures in the accessed video picture are combined (806, 808, 822), decoding the video picture to provide a decoded representation of at least one of the multiple pictures (824, 826), and providing the accessed information and the decoded video picture as output (824, 826). Some other implementations format or process the information that indicates how multiple pictures included in a single video picture are combined into the single video picture, and format or process an encoded representation of the combined multiple pictures.

公开(公告)号：US09641852B2

公开(公告)日：2017-05-02

申请号：US14960295

申请日：2015-12-04

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Taoran Lu ,  Peng Yin ,  Yuwen He

IPC: H04N19/176 ,  H04N19/187 ,  H04N19/30 ,  H04N19/103 ,  H04N19/156 ,  H04N19/172 ,  H04N19/50 ,  H04N19/117 ,  H04N19/12 ,  H04N19/132

CPC classification number: H04N19/187 ,  H04N19/103 ,  H04N19/117 ,  H04N19/12 ,  H04N19/132 ,  H04N19/156 ,  H04N19/172 ,  H04N19/30 ,  H04N19/50

Abstract: A multi-layer video system has a first layer encoder that encodes a first layer of video information, at least one second layer encoder that encodes at least one second layer of video information, and an encoder side reference processing unit (RPU) that estimates one or more of an optimal filter or an optimal process that applies on a reference picture that is reconstructed from the first video information layer, and processes a current picture of the second video information layer, based on a correlation between the first layer reconstructed reference picture. The correlation relates to a complexity characteristic that scaleably corresponds to the first video information layer reconstructed reference picture and the second video information layer current picture. A scalable video bitstream is outputted, which may be decoded by a compatible decoder. A decoder side RPU and the encoder side RPU function as an RPU pair.

公开(公告)号：US09497475B2

公开(公告)日：2016-11-15

申请号：US14687534

申请日：2015-04-15

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Guan-Ming Su ,  Sheng Qu ,  Peng Yin

IPC: H04N7/12 ,  G06F11/30 ,  H04N19/44 ,  H04N19/503 ,  H04N19/105 ,  H04N19/14 ,  H04N19/186 ,  H04N19/154 ,  H04N19/182 ,  H04N19/33

CPC classification number: H04N19/33 ,  H04N19/105 ,  H04N19/14 ,  H04N19/154 ,  H04N19/182 ,  H04N19/186 ,  H04N19/44 ,  H04N19/503

Abstract: A sequence of visual dynamic range (VDR) images is encoded using a standard dynamic range (SDR) base layer and one or more enhancement layers. A predicted VDR image is generated from an SDR input by using a weighted, multi-band, cross-color channel prediction model. Exponential weights with an adaptable decay parameter for each band are also presented.

Abstract translation: 使用标准动态范围（SDR）基础层和一个或多个增强层对视觉动态范围（VDR）图像序列进行编码。 通过使用加权的多频带交叉颜色信道预测模型从SDR输入生成预测的VDR图像。 还给出了每个频带具有适应衰减参数的指数权重。

公开(公告)号：US20160134870A1

公开(公告)日：2016-05-12

申请号：US14933679

申请日：2015-11-05

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Taoran Lu ,  Peng Yin ,  Tao Chen ,  Guan-Ming Su

IPC: H04N19/124 ,  H04N19/186 ,  H04N19/65 ,  H04N19/172

CPC classification number: H04N19/124 ,  H04N19/126 ,  H04N19/136 ,  H04N19/147 ,  H04N19/172 ,  H04N19/186 ,  H04N19/65

Abstract: A high dynamic range input video signal characterized by either a gamma-based or a perceptually-quantized (PQ) source electro-optical transfer function (EOTF) is to be compressed. Given a luminance range for an image-region in the input, for a gamma-coded input signal, a rate-control adaptation method in the encoder adjusts a region-based quantization parameter (QP) so that it increases in highlight regions and decreases in dark regions, otherwise, for a PQ-coded input, the region-based QP increases in the dark areas and decreases in the highlight areas.

Abstract translation: 要压缩以伽马或感知量化（PQ）源电光传递函数（EOTF）为特征的高动态范围输入视频信号。 给定输入中的图像区域的亮度范围，对于伽马编码的输入信号，编码器中的速率控制适配方法调整基于区域的量化参数（QP），使得其在高亮区域增加并减小 暗区域，否则，对于PQ编码的输入，基于区域的QP在暗区域增加并且在高亮区域中减小。