公开(公告)号：US20240430455A1

公开(公告)日：2024-12-26

申请号：US18341720

申请日：2023-06-26

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

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

IPC: H04N19/186 ,  H04N19/117 ,  H04N19/136 ,  H04N19/176 ,  H04N19/196

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：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.

公开(公告)号：US20240163485A1

公开(公告)日：2024-05-16

申请号：US18548137

申请日：2022-03-24

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Arunkumar MOHANANCHETTIAR ,  Jay Nitin SHINGALA ,  Peng YIN ,  Sean Thomas MCCARTHY

IPC: H04N19/70 ,  H04N19/136 ,  H04N19/42 ,  H04N19/91

CPC classification number: H04N19/70 ,  H04N19/136 ,  H04N19/42 ,  H04N19/91

Abstract: Methods, systems, and bitstream syntax are described for the entropy modeling of latent features in image and video coding using a combination of probability density functions. Using high-level syntax elements, an encoder may signal to compliant decoders the multi-distribution entropy model using: the number of one or more PDFs being used, an identifier of each PDF being used among a list of available PDFs, the number of PDF parameters in each PDF, and syntax elements indicating which PDF parameters across two or more PDFs being used are being shared.

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：US20210281866A1

公开(公告)日：2021-09-09

申请号：US17206843

申请日：2021-03-19

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Peng YIN ,  Taoran LU ,  Tao CHEN

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

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：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：US20190058892A1

公开(公告)日：2019-02-21

申请号：US16168644

申请日：2018-10-23

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Peng YIN ,  Taoran LU ,  Tao CHEN

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

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：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.