公开(公告)号：US20240007678A1

公开(公告)日：2024-01-04

申请号：US18470353

申请日：2023-09-19

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

CPC classification number: H04N19/70 ,  H04N19/186 ,  H04N19/30 ,  H04N19/85 ,  G06T5/007 ,  G06T2207/20208

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：US20220166991A1

公开(公告)日：2022-05-26

申请号：US17666887

申请日：2022-02-08

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Robin Atkins ,  Peng YIN ,  Taoran LU ,  Fangjun PU ,  Sean Thomas MCCARTHY ,  Walter J. HUSAK ,  Tao CHEN ,  Guan-Ming SU

IPC: H04N19/31 ,  H04N19/187 ,  H04N19/172 ,  H04N19/30 ,  H04N19/46 ,  H04N19/70

Abstract: Methods and systems for frame rate scalability are described. Support is provided for input and output video sequences with variable frame rate and variable shutter angle across scenes, or for input video sequences with fixed input frame rate and input shutter angle, but allowing a decoder to generate a video output at a different output frame rate and shutter angle than the corresponding input values. Techniques allowing a decoder to decode more computationally-efficiently a specific backward compatible target frame rate and shutter angle among those allowed are also presented.

公开(公告)号：US20190124367A1

公开(公告)日：2019-04-25

申请号：US16091078

申请日：2017-05-09

Applicant: Dolby Laboratories Licensing Corporation

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

IPC: H04N19/98 ,  H04N19/186 ,  H04N19/85

CPC classification number: H04N19/98 ,  H04N19/117 ,  H04N19/186 ,  H04N19/46 ,  H04N19/85

Abstract: Methods for the chroma reshaping of high-dynamic range (HDR) signals are presented. For each input pixel, a first scaler is generated based on the pixel luminance and a luma-based chroma reshaping (LCR) function. A second scaler is generated based on a saturation-based chroma reshaping (SCR) function and the saturation value of the pixel. A cascaded scaler is generated by multiplying the first scaler with the second scaler. Reshaped chroma values are generated by multiplying the input chroma values with the cascaded scaler. The characteristics of preferred LCR and SCR functions are discussed. Inverse decoding methods based on chroma-reshaping metadata that define the LCR and SCR functions are also described.

公开(公告)号：US20240305791A1

公开(公告)日：2024-09-12

申请号：US18666734

申请日：2024-05-16

Applicant: Dolby Laboratories Licensing Corporation

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

IPC: H04N19/159 ,  H04N19/124 ,  H04N19/182 ,  H04N19/44

CPC classification number: H04N19/159 ,  H04N19/124 ,  H04N19/182 ,  H04N19/45

Abstract: Given a sequence of images in a first codeword representation, methods, processes, and systems are presented for integrating reshaping into a next generation video codec for encoding and decoding the images, wherein reshaping allows part of the images to be coded in a second codeword representation which allows more efficient compression than using the first codeword representation. A variety of architectures are discussed, including: an out-of-loop reshaping architecture, an in-loop-for intra pictures only reshaping architecture, an in-loop architecture for prediction residuals, and a hybrid in-loop reshaping architecture. Syntax methods for signaling reshaping parameters, and image-encoding methods optimized with respect to reshaping are also presented.

公开(公告)号：US20230171417A1

公开(公告)日：2023-06-01

申请号：US18096425

申请日：2023-01-12

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Robin Atkins ,  Peng YIN ,  Taoran LU ,  Fangjun PU ,  Sean Thomas MCCARTHY ,  Walter J. HUSAK ,  Tao CHEN ,  Guan-Ming SU

IPC: H04N19/31 ,  H04N19/187 ,  H04N19/172 ,  H04N19/30 ,  H04N19/46 ,  H04N19/70

CPC classification number: H04N19/31 ,  H04N19/187 ,  H04N19/172 ,  H04N19/30 ,  H04N19/46 ,  H04N19/70

Abstract: Methods and systems for frame rate scalability are described. Support is provided for input and output video sequences with variable frame rate and variable shutter angle across scenes, or for input video sequences with fixed input frame rate and input shutter angle, but allowing a decoder to generate a video output at a different output frame rate and shutter angle than the corresponding input values. Techniques allowing a decoder to decode more computationally-efficiently a specific backward compatible target frame rate and shutter angle among those allowed are also presented.

公开(公告)号：US20220279210A1

公开(公告)日：2022-09-01

申请号：US17613801

申请日：2020-05-27

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Fangjun PU ,  Toaran LU ,  Peng Yin ,  Sean Thomas MCCARTHY

IPC: H04N19/70 ,  H04N19/46 ,  H04N19/186 ,  H04N19/172

Abstract: A quantization parameter signalling mechanism for both SDR and HDR content in video coding is described using two approaches. The first approach is to send the user-defined Qpc table directly in high level syntax. This leads to more flexible and efficient QP control for future codec development and video content coding. The second approach is to signal luma and chroma QPs independently. This approach eliminates the need for Qpc tables and removes the dependency of chroma quantization parameter on luma QP.

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：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：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.

公开(公告)号：US20240422345A1

公开(公告)日：2024-12-19

申请号：US18687768

申请日：2022-08-05

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Peng YIN ,  Fangjun PU ,  Taoran LU ,  Arjun ARORA ,  Guan-Ming SU ,  Tao CHEN ,  Sean Thomas MCCARTHY ,  Walter J. HUSAK

IPC: H04N19/517 ,  H04N19/117 ,  H04N19/82

Abstract: An input image represented in an input domain is received from an input video signal. Forward reshaping is performed on the input image to generate a forward reshaped image represented in a reshaped image domain. Non-reshaping encoding operations are performed to encode the reshaped image into an encoded video signal. At least one of the non-reshaping encoding operations is implemented with an ML model that has been previously trained with training images in one or more training datasets in a preceding training stage. A recipient device of the encoded video signal is caused to generate a reconstructed image from the forward reshaped image.