公开(公告)号：US20240388738A1

公开(公告)日：2024-11-21

申请号：US18787909

申请日：2024-07-29

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Tao CHEN ,  Peng YIN ,  Taoran LU ,  Walter J. HUSAK

IPC: H04N19/70 ,  H04N19/14 ,  H04N19/186 ,  H04N19/20

Abstract: Methods are described to communicate source color volume information in a coded bitstream using SEI messaging. Such data include at least the minimum, maximum, and average luminance values in the source data plus optional data that may include the color volume x and y chromaticity coordinates for the input color primaries (e.g., red, green, and blue) of the source data, and the color x and y chromaticity coordinates for the color primaries corresponding to the minimum, average, and maximum luminance values in the source data. Messaging data signaling an active region in each picture may also be included.

公开(公告)号：US20230171434A1

公开(公告)日：2023-06-01

申请号：US18162492

申请日：2023-01-31

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Tao CHEN ,  Peng YIN ,  Taoran LU ,  Walter J. HUSAK

IPC: H04N19/70 ,  H04N19/14 ,  H04N19/186 ,  H04N19/20

CPC classification number: H04N19/70 ,  H04N19/14 ,  H04N19/186 ,  H04N19/20

Abstract: Methods are described to communicate source color volume information in a coded bitstream using SEI messaging. Such data include at least the minimum, maximum, and average luminance values in the source data plus optional data that may include the color volume x and y chromaticity coordinates for the input color primaries (e.g., red, green, and blue) of the source data, and the color x and y chromaticity coordinates for the color primaries corresponding to the minimum, average, and maximum luminance values in the source data. Messaging data signaling an active region in each picture may also be included.

公开(公告)号：US20210289212A1

公开(公告)日：2021-09-16

申请号：US17334631

申请日：2021-05-28

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Peng YIN ,  Guan-Ming SU ,  Taoran LU ,  Tao CHEN ,  Walter J. HUSAK

IPC: H04N19/167 ,  H04N19/117 ,  H04N19/124 ,  H04N19/17 ,  H04N19/132 ,  H04N19/182 ,  H04N19/60 ,  H04N19/70 ,  H04L12/26

Abstract: Sample data and metadata related to spatial regions in images may be received from a coded video signal. It is determined whether specific spatial regions in the images correspond to a specific region of luminance levels. In response to determining the specific spatial regions correspond to the specific region of luminance levels, signal processing and video compression operations are performed on sets of samples in the specific spatial regions. The signal processing and video compression operations are at least partially dependent on the specific region of luminance levels.

公开(公告)号：US20200045340A1

公开(公告)日：2020-02-06

申请号：US16339992

申请日：2017-10-03

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Tao CHEN ,  Peng YIN ,  Taoran LU ,  Walter J. HUSAK

IPC: H04N19/70 ,  H04N19/186 ,  H04N19/14 ,  H04N19/20

Abstract: Methods are described to communicate source color volume information in a coded bitstream using SEI messaging. Such data include at least the minimum, maximum, and average luminance values in the source data plus optional data that may include the color volume x and y chromaticity coordinates for the input color primaries (e.g., red, green, and blue) of the source data, and the color x and y chromaticity coordinates for the color primaries corresponding to the Messaging data signaling an active region in each picture may also be included.

公开(公告)号：US20200029078A1

公开(公告)日：2020-01-23

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：US20200021825A1

公开(公告)日：2020-01-16

申请号：US16580820

申请日：2019-09-24

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Peng YIN ,  Taoran LU ,  Tao CHEN

IPC: H04N19/33 ,  H04N19/80 ,  H04N19/59 ,  H04N19/105

Abstract: The precision of up-sampling operations in a layered coding system is preserved when operating on video data with high bit-depth. In response to bit-depth requirements of the video coding or decoding system, scaling and rounding parameters are determined for a separable up-scaling filter. Input data are first filtered across a first spatial direction using a first rounding parameter to generate first up-sampled data. First intermediate data are generated by scaling the first up-sampled data using a first shift parameter. The intermediate data are then filtered across a second spatial direction using a second rounding parameter to generate second up-sampled data. Second intermediate data are generated by scaling the second up-sampled data using a second shift parameter. Final up-sampled data may be generated by clipping the second intermediate data.

公开(公告)号：US20190045181A1

公开(公告)日：2019-02-07

申请号：US16053643

申请日：2018-08-02

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Timo KUNKEL ,  Robin ATKINS ,  Tao CHEN

IPC: H04N17/02 ,  H04N9/64 ,  G06T7/90 ,  G06K7/14 ,  G06K19/06

Abstract: In some embodiments, a display device is disclosed to optically communicating display parameters. The device receives input image data. Embedded in the input image data is a code value identifying a request for a portion of a display parameter of the display device. The device decodes the embedded code value. The device generates an optical image based on the request and transmits the generated optical image to an output of the display device to communicate the requested portion of the requested display parameter.

公开(公告)号：US20180103253A1

公开(公告)日：2018-04-12

申请号：US15728939

申请日：2017-10-10

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Taoran LU ,  Fangjun PU ,  Peng YIN ,  Tao CHEN

IPC: H04N19/124 ,  H04N19/186 ,  H04N19/59

CPC classification number: H04N19/124 ,  H04N19/126 ,  H04N19/147 ,  H04N19/157 ,  H04N19/186 ,  H04N19/59

Abstract: Methods to improve the quality of coding high-dynamic range (HDR) signals are presented. Instead of using a single chroma quantization table for all color formats, a video encoder may adaptively use separate tables for each one, and transmit the table's ID to a decoder. Examples for chroma quantization tables for video content encoded in the YCbCr (PQ) and ICtCp (PQ) color formats under a variety of color gamut containers are provided.

公开(公告)号：US20170244983A1

公开(公告)日：2017-08-24

申请号：US15521597

申请日：2015-10-26

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Robin ATKINS ,  Guan-Ming SU ,  Tao CHEN

IPC: H04N19/98 ,  H04N19/30 ,  G06T5/00 ,  H04N19/85

CPC classification number: H04N19/98 ,  G06T5/009 ,  H04N19/30 ,  H04N19/85

Abstract: In high-dynamic range (HDR) coding, content mapping translates an HDR signal to a signal of lower dynamic range. Coding and prediction in layered coding of HDR signals is improved if content mapping utilizes signal color ranges beyond those defined by a traditional electro-optical Transfer function (EOTF) or its inverse (IEOTF or OETF). Extended EOTF and IEOTF functions are derived based on their mirror points. Examples of extended EOTFs are given for ITU BT. 1886 and SMPTE ST 2084.

公开(公告)号：US20170214916A1

公开(公告)日：2017-07-27

申请号：US15410563

申请日：2017-01-19

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Taoran LU ,  Fangjun PU ,  Peng YIN ,  Tao CHEN ,  Walter J. HUSAK

IPC: H04N19/124 ,  G06T5/00 ,  H04N19/182 ,  H04N19/169 ,  H04N19/186 ,  H04N19/17

CPC classification number: H04N19/124 ,  G06T5/007 ,  G06T2207/20208 ,  H04N19/17 ,  H04N19/182 ,  H04N19/186 ,  H04N19/1887 ,  H04N19/30 ,  H04N19/85 ,  H04N19/98

Abstract: A processor for forward reshaping to a target bit depth receives an input image with an input bit depth. The input luminance range is divided into luminance bands and each band is assigned a visual importance index. The output codewords at the target bit depth are divided into codeword bins and each bin is assigned to one of the luminance bands. Each codeword bin is assigned the visual importance index of the luminance band it belongs. Each bin is allocated a number of reshaped codewords according to its visual importance index and a codeword mapping function, where bins with the highest importance index are allocated more codewords than the other bins. A signal reshaping function is generated based on the allocation of codewords, and the reshaping function is applied to the input image to generate an output image in the target bit depth.