公开(公告)号：US11166023B2

公开(公告)日：2021-11-02

申请号：US16495812

申请日：2018-03-21

Applicant: Dolby Laboratories Licensing Corporation

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

IPC: H04N19/124 ,  H04N19/186

Abstract: Methods for quantization parameter (QP) prediction are presented. In a coded bitstream that includes QP values, instead of simply embedding all delta QP values in the bitstream, the bitstream may include QP-related syntax elements that allow a decoder to reconstruct the delta QP values using luma-based QP prediction. Encoding and decoding bitstream examples are provided where delta QP values may be predicted using information from just the luminance values of the prediction blocks of the current block or by additional luminance information from its known neighbors (e.g., from the left or above blocks) and a base QP value.

公开(公告)号：US10972756B2

公开(公告)日：2021-04-06

申请号：US16710904

申请日：2019-12-11

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Peng Yin ,  Taoran Lu ,  Fangjun Pu ,  Tao Chen ,  Walter J. Husak

IPC: H04N19/70 ,  H04N19/186 ,  H04N19/30 ,  H04N19/85 ,  G06T5/00

Abstract: In a method to improve the coding efficiency of high-dynamic range (HDR) images, a decoder parses sequence processing set (SPS) data from an input coded bitstream to detect that an HDR extension syntax structure is present in the parsed SPS data. It extracts from the HDR extension syntax structure post-processing information that includes one or more of a color space enabled flag, a color enhancement enabled flag, an adaptive reshaping enabled flag, a dynamic range conversion flag, a color correction enabled flag, or an SDR viewable flag. It decodes the input bitstream to generate a preliminary output decoded signal, and generates a second output signal based on the preliminary output signal and the post-processing information.

公开(公告)号：US20210076079A1

公开(公告)日：2021-03-11

申请号：US17005333

申请日：2020-08-28

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Taoran Lu ,  Peng Yin ,  Fangjun Pu

IPC: H04N19/98 ,  H04N19/187 ,  H04N19/186 ,  H04N19/136 ,  H04N19/46 ,  H04N19/33 ,  H04N19/172

Abstract: Methods, processes, and systems are presented for inter-layer scaling and mapping to perform dynamic-range scalability in video coding using single-loop video decoders. Two approaches are proposed: a) A mapping function is applied to each of the color components, b) a mapping function is applied to the luma component and luma-based scaling is applied to the chroma components. Both schemes may be combined with existing schemes for in-loop reshaping, such as luma mapping and chroma residual scaling employed in the versatile video codec (VVC).

公开(公告)号：US10904524B2

公开(公告)日：2021-01-26

申请号：US16893454

申请日：2020-06-05

Applicant: Dolby Laboratories Licensing Corporation

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

IPC: H04N19/117 ,  H04N19/136 ,  H04N19/82

Abstract: Methods, processes, and systems are presented for adaptive loop filtering in coding and decoding high dynamic range (HDR) video. Given an input image block, its luminance information may be used to adapt one or more parameters of adaptive loop filtering and compute gradient and directionality information, activity information, a classification index, and adaptive-loop-filtering coefficients.

公开(公告)号：US10542289B2

公开(公告)日：2020-01-21

申请号：US15580246

申请日：2016-07-14

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Peng Yin ,  Taoran Lu ,  Fangjun Pu ,  Tao Chen ,  Walter J. Husak

IPC: H04N19/70 ,  H04N19/186 ,  H04N19/85 ,  G06T5/00

Abstract: In a method to improve the coding efficiency of high-dynamic range (HDR) images, a decoder parses sequence processing set (SPS) data from an input coded bitstream to detect that an HDR extension syntax structure is present in the parsed SPS data. It extracts from the HDR extension syntax structure post-processing information that includes one or more of a color space enabled flag, a color enhancement enabled flag, an adaptive reshaping enabled flag, a dynamic range conversion flag, a color correction enabled flag, or an SDR viewable flag. It decodes the input bitstream to generate a preliminary output decoded signal, and generates a second output signal based on the preliminary output signal and the post-processing information.

公开(公告)号：US10382735B2

公开(公告)日：2019-08-13

申请号：US15724009

申请日：2017-10-03

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Walter J. Husak ,  Robin Atkins ,  Peng Yin ,  Taoran Lu ,  Tao Chen

IPC: H04N11/20 ,  H04N9/77 ,  H04N7/08 ,  H04N5/20 ,  H04N9/67

Abstract: Given existing color remapping information (CRI) messaging variables, methods are described to communicate color volume information for a targeted display to a downstream receiver. Bits 7:0 of the 32-bit colour_remap_id are used to extract a first value. If the first value is not a reserved value, then the first value is used as an index to a look-up table to generate a first luminance value for a targeted display, otherwise a second value is generated based on bits 31:9 in the colour_remap_id messaging variable and the first luminance value for a targeted display is generated based on the second value. The methods may be applied to communicate via CRI messaging a minimum luminance value, a maximum luminance value, and color primaries information of the targeted display.

公开(公告)号：US20190141321A1

公开(公告)日：2019-05-09

申请号：US16180775

申请日：2018-11-05

Applicant: Dolby Laboratories Licensing Corporation

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

IPC: H04N19/117 ,  H04N19/136 ,  H04N19/82

CPC classification number: H04N19/117 ,  H04N19/136 ,  H04N19/82

Abstract: Methods, processes, and systems are presented for adaptive loop filtering in coding and decoding high dynamic range (HDR) video. Given an input image block, its luminance information may be used to adapt one or more parameters of adaptive loop filtering and compute gradient and directionality information, activity information, a classification index, and adaptive-loop-filtering coefficients.

公开(公告)号：US10182207B2

公开(公告)日：2019-01-15

申请号：US15544114

申请日：2016-02-16

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Taoran Lu ,  Hariharan Ganapathy-Kathirvelu ,  Peng Yin ,  Glenn N. Dickins ,  Xuejing Sun

IPC: H04N7/15 ,  H04M3/56 ,  H04N7/14 ,  H04L29/06

Abstract: The disclosure relates to handling nuisance in teleconference system. An endpoint device (400) for use in a teleconference includes an acquiring unit (401), a judging unit (402), a controller (403) and a processing unit (404). The acquiring unit acquires a media stream for presentation in the teleconference, and receives information from another device. The information includes a first estimation on whether the media stream is a nuisance to the teleconference. As the nuisance to a teleconference, audio or video signals are perceived by users as actually not relevant to the conference session or causing unpleasant feeling or confusion. The judging unit decides whether the media stream is the nuisance at least based on the information. The controller controls the processing of the media stream to degrade or suppress the presentation of the media stream in case that the media stream is decided as the nuisance. The processing unit processes the media stream under the control of the controller.

公开(公告)号：US10097820B2

公开(公告)日：2018-10-09

申请号：US14348263

申请日：2012-09-27

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Tao Chen ,  Hariharan Ganapathy, I ,  Samir N. Hulyalkar ,  Gopi Lakshminarayanan ,  Peng Yin ,  Taoran Lu ,  Walter J. Husak

IPC: H04N13/00 ,  H04N19/119 ,  H04N13/106 ,  H04N19/597

Abstract: A high resolution 3D image may be encoded into a first multiplexed image frame and a second multiplexed image frame in a base layer (BL) video signal and an enhancement layer (EL) video signal. The first multiplexed image frame may comprise horizontal high resolution image data for both eyes, while the second multiplexed image frame may comprise vertical high resolution image data for both eyes. Encoded symmetric-resolution image data for the 3D image may be distributed to a wide variety of devices for 3D image processing and rendering. A recipient device may reconstruct reduced resolution 3D image from one of the first multiplexed image frame or the second multiplexed image frame. A recipient device may also reconstruct high resolution 3D image by combining high resolution image data from both of the first multiplexed image frame and the second multiplexed image frame.

公开(公告)号：US20180098046A1

公开(公告)日：2018-04-05

申请号：US15724009

申请日：2017-10-03

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Walter J. Husak ,  Robin Atkins ,  Peng Yin ,  Taoran Lu ,  Tao Chen

IPC: H04N11/20 ,  H04N7/08 ,  H04N9/77

CPC classification number: H04N11/20 ,  H04N5/20 ,  H04N7/08 ,  H04N9/67 ,  H04N9/77

Abstract: Given existing color remapping information (CRI) messaging variables, methods are described to communicate color volume information for a targeted display to a downstream receiver. Bits 7:0 of the 32-bit colour_remap_id are used to extract a first value. If the first value is not a reserved value, then the first value is used as an index to a look-up table to generate a first luminance value for a targeted display, otherwise a second value is generated based on bits 31:9 in the colour_remap_id messaging variable and the first luminance value for a targeted display is generated based on the second value. The methods may be applied to communicate via CRI messaging a minimum luminance value, a maximum luminance value, and color primaries information of the targeted display.