公开(公告)号：US20240080489A1

公开(公告)日：2024-03-07

申请号：US18506828

申请日：2023-11-10

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Fangjun PU ,  Taoran LU ,  Peng YIN ,  Sean Thomas MCCARTHY

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

CPC classification number: H04N19/70 ,  H04N19/172 ,  H04N19/186 ,  H04N19/46

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：US20220286667A1

公开(公告)日：2022-09-08

申请号：US17422710

申请日：2020-03-11

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Taoran LU ,  Fangjun PU ,  Peng YIN ,  Sean Thomas McCarthy ,  Tao CHEN

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/174 ,  H04N19/46 ,  H04N19/70

Abstract: Methods, systems, and bitstream syntax are described for canvas size, single layer or multi-layer, sealable decoding, with support for regions of interest (ROI). using a decoder supporting reference picture resampling. Offset parameters for a region of interest in a current picture and offset parameters for an ROI in a reference picture are taken into consideration when computing scaling factors to apply reference picture resampling Syntax elements for supporting ROI regions under reference picture resampling arc also presented.

公开(公告)号：US20220150548A1

公开(公告)日：2022-05-12

申请号：US17581827

申请日：2022-01-21

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：US20190098317A1

公开(公告)日：2019-03-28

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 ,  H04N19/12

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：US20180131938A1

公开(公告)日：2018-05-10

申请号：US15564185

申请日：2016-04-19

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

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

IPC: H04N19/126 ,  H04N19/186 ,  H04N19/85 ,  G06T5/00

CPC classification number: H04N19/126 ,  G06T5/009 ,  G06T2207/20208 ,  H04N9/67 ,  H04N19/186 ,  H04N19/85

Abstract: In a method to improve the coding efficiency of high-dynamic range images coded in a perceptually quantized IPT color space (IPT-PQ), the values of the chroma components (P/T) of an input signal in IPT-PQ color space are divided by a factor of two before being encoded with standard-based encoders, such as AVC or HEVC; thus better matching the covariance characteristics of YCbCr signals. In addition, the order of the P and T chroma components may be swapped and the sign of the T chroma component may be inverted. Color transformation matrices for efficient forward and backward reshaping in the IPT-PQ color space are provided.

公开(公告)号：US20240357112A1

公开(公告)日：2024-10-24

申请号：US18685319

申请日：2022-08-03

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Arunkumar MOHANANCHETTIAR ,  Jay Nitin SHINGALA ,  Pankaj SHARMA ,  Nijil KOLLERI ,  Peng YIN ,  Arjun ARORA ,  Fangjun PU ,  Taoran LU ,  Sean Thomas MCCARTHY ,  Walter J. HUSAK

IPC: H04N19/124 ,  G06V10/771 ,  G06V10/80 ,  H04N19/46 ,  H04N19/59 ,  H04N19/70

CPC classification number: H04N19/124 ,  G06V10/771 ,  G06V10/803 ,  H04N19/46 ,  H04N19/59 ,  H04N19/70

Abstract: Methods, systems, and bitstream syntax are described for the fusion of latent features in multi-level, end-to-end, neural networks used in image and video compression. The fused architecture may be static or dynamic based on image characteristics (e.g., natural images versus screen content images) or other coding parameters, such as bitrate constrains or rate-distortion optimization. A variety of multi-level fusion architectures are discussed.

公开(公告)号：US20230021624A1

公开(公告)日：2023-01-26

申请号：US17940819

申请日：2022-09-08

Applicant: Dolby Laboratories Licensing Corporation

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

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

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：US20220385935A1

公开(公告)日：2022-12-01

申请号：US17629093

申请日：2020-08-05

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Taoran LU ,  Fangjun PU ,  Peng YIN ,  Sean Thomas MCCARTHY ,  Tao CHEN

IPC: H04N19/513 ,  H04N19/33 ,  H04N19/105 ,  H04N19/172

Abstract: Methods and systems for canvas size scalability across the same or different bitstream layers of a video coded bitstream are described. Offset parameters for a conformance window, a reference region of interest (ROI) in a reference layer, and a current ROI in a current layer are received. The width and height of a current ROI and a reference ROI are computed based on the offset parameters and they are used to generate a width and height scaling factor to be used by a reference picture resampling unit to generate an output picture based on the current ROI and the reference ROI.

公开(公告)号：US20210274222A1

公开(公告)日：2021-09-02

申请号：US17203698

申请日：2021-03-16

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：US20200267392A1

公开(公告)日：2020-08-20

申请号：US16619074

申请日：2018-06-29

Applicant: Dolby Laboratories Licensing Corporation

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

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

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.