公开(公告)号：US20160358319A1

公开(公告)日：2016-12-08

申请号：US15035477

申请日：2014-11-19

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Ning XU ,  Tao CHEN ,  James E. CRENSHAW ,  Timo KUNKEL ,  Bongsun LEE

IPC: G06T5/00 ,  H04N1/60 ,  G06T5/40 ,  G06T7/40

CPC classification number: G06T5/007 ,  G06T5/40 ,  G06T7/90 ,  G06T2207/20016 ,  G06T2207/20028 ,  G06T2207/20208 ,  H04N1/4072 ,  H04N1/6027

Abstract: Novel methods and systems for inverse tone mapping are disclosed. A scene can be analyzed to obtain highlight detection from bright light sources and specular reflections. An inverse tone mapping curve can be calculated based on the lower dynamic range and higher dynamic range displays. Multi-scale filtering can be applied to reduce noise or artifacts.

Abstract translation: 公开了用于逆色调映射的新颖方法和系统。 可以分析场景，从亮光源和镜面反射中获取高光检测。 可以基于较低的动态范围和较高的动态范围显示来计算逆谱映射曲线。 可以应用多尺度滤波来减少噪声或伪影。

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：US20230164335A1

公开(公告)日：2023-05-25

申请号：US18158417

申请日：2023-01-23

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Peng Yin ,  Taoran LU ,  Tao CHEN

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

CPC classification number: 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：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：US20210150680A1

公开(公告)日：2021-05-20

申请号：US16623326

申请日：2018-06-13

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Neeraj J. GADGIL ,  Guan-Ming SU ,  Tao CHEN ,  Yoon Yung LEE

IPC: G06T5/00 ,  G06T5/40 ,  H04N19/186 ,  H04N19/98

Abstract: A standard dynamic range (SDR) image is received. Composer metadata is generated for mapping the SDR image to an enhanced dynamic range (EDR) image. The composer metadata specifies a backward reshaping mapping that is generated from SDR-EDR image pairs in a training database. The SDR-EDR image pairs comprise SDR images that do not include the SDR image and EDR images that corresponds to the SDR images. The SDR image and the composer metadata are encoded in an output SDR video signal. An EDR display operating with a receiver of the output SDR video signal is caused to render an EDR display image. The EDR display image is derived from a composed EDR image composed from the SDR image based on the composer metadata.

公开(公告)号：US20190320191A1

公开(公告)日：2019-10-17

申请号：US16303028

申请日：2017-05-17

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Qing SONG ,  Guan-Ming SU ,  Qian CHEN ,  Tao CHEN

IPC: H04N19/30 ,  H04N19/124 ,  H04N19/85 ,  H04N19/98 ,  H04N19/136 ,  H04N19/186

Abstract: Methods and systems for adaptive chroma reshaping are discussed. Given an input image, a luma-reshaped image is first generated based on its luma component. For each chroma component of the input image, the range of the pixel values in the luma reshaped image is divided into bins, and for each bin a maximal scale factor is generated based on the chroma pixel values in the input image corresponding to the pixels of the luma reshaped image in the bin. A forward reshaping function is generated based on a reference reshaped function and the maximal scale factors, and reshaped chroma pixel values for the chroma component are generated based on the forward reshaping function and the corresponding pixel values in the luma reshaped image. Implementations options using look-up tables for mobile platforms with limited computational resources are also described.

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.