公开(公告)号：US20250133241A1

公开(公告)日：2025-04-24

申请号：US18688315

申请日：2022-09-08

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Harshad Kadu ,  Guan-Ming Su ,  Sheng Qu ,  Per Jonas Andreas Klittmark ,  Hariharan Ganapathy Kathirvelu

IPC: H04N19/98 ,  G06T5/90 ,  H04N19/186 ,  H04N19/46

Abstract: Tensor-Product B-splines (TPB) have been shown to improve video quality when used to represent reshaping functions to map reshaped standard dynamic range content into high dynamic range (HDR) content; however, TPB prediction is computationally intensive and may not be supported by legacy devices. Methods and systems for backwards-compatible signaling of TPB-related metadata and a fast TPB prediction method are presented to overcome both of these limitations. Computation overhead for a TPB-based 3D look-up table is reduced by using temporary two-dimensional arrays. A remapping of the most significant bits of a legacy bit-depth parameter allows for backwards compatibility.

公开(公告)号：US12149753B2

公开(公告)日：2024-11-19

申请号：US17920391

申请日：2021-04-21

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Guan-Ming Su ,  Harshad Kadu

IPC: H04N19/98 ,  G06T5/90 ,  H04N19/186 ,  H04N23/741

Abstract: A method, for generating (a) a forward reshaping function for compressing an input high-dynamic range (HDR) image into a reshaped standard-dynamic-range (SDR) image and (b) a backward reshaping function for decompressing the reshaped SDR image into a reconstructed HDR image, includes (i) optimizing the forward reshaping function to minimize a deviation between the reshaped SDR image and an input SDR image corresponding to the input HDR image, (ii) optimizing the backward reshaping function to minimize a deviation between the reconstructed HDR image and the input HDR image, and (iii) until a termination condition is met, applying a correction to the input SDR image and reiterating, based on the input SDR image as corrected, the steps of optimizing the forward and backward reshaping functions.

公开(公告)号：US12108060B2

公开(公告)日：2024-10-01

申请号：US18477511

申请日：2023-09-28

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 ,  H04N19/172 ,  H04N19/187 ,  H04N19/30 ,  H04N19/46 ,  H04N19/70

CPC classification number: H04N19/31 ,  H04N19/172 ,  H04N19/187 ,  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：US12003746B2

公开(公告)日：2024-06-04

申请号：US17800886

申请日：2021-02-17

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Guan-Ming Su

IPC: H04N19/436 ,  H04N19/119 ,  H04N19/136 ,  H04N19/186

CPC classification number: H04N19/436 ,  H04N19/119 ,  H04N19/136 ,  H04N19/186

Abstract: A source color grade and a destination color grade may be received by an end-to-end image mapping pipeline comprising forward and backward paths. Forward neural networks in the forward path may be applied to generate, from the source color grade, a forward reshaped color grade corresponding to the destination color grade. Backward neural networks in the backward path may be applied to generate, from the forward reshaped color grade, a backward reshaped color grade corresponding to the source color grade. An overall neural network cost function may be specified for the forward path and the backward path to generate a cost that may be used as a basis for determining operational parameters for the forward and backward neural networks.

公开(公告)号：US11991380B2

公开(公告)日：2024-05-21

申请号：US18009846

申请日：2021-06-30

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Robin Atkins ,  Guan-Ming Su ,  Gopi Lakshminarayanan

IPC: H04N19/46 ,  G06T7/90 ,  H04N19/30

CPC classification number: H04N19/46 ,  G06T7/90 ,  H04N19/30 ,  G06T2207/10024 ,  G06T2207/20208

Abstract: A method for distributing High Dynamic Range (HDR) content to playback devices for displaying images where the HDR content is encoded to an HDR bitstream and the HDR bitstream is subsequently decoded by a playback device. The HDR bitstream contains auxiliary metadata packets that are based upon the processing capability of the playback device.

公开(公告)号：US11936888B1

公开(公告)日：2024-03-19

申请号：US18506758

申请日：2023-11-10

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

CPC classification number: H04N19/31 ,  H04N19/172 ,  H04N19/187 ,  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：US20240015315A1

公开(公告)日：2024-01-11

申请号：US18334306

申请日：2023-06-13

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：US11871015B2

公开(公告)日：2024-01-09

申请号：US17950087

申请日：2022-09-21

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 ,  H04N19/172 ,  H04N19/187 ,  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：US20230005243A1

公开(公告)日：2023-01-05

申请号：US17780279

申请日：2020-12-02

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Amirhossein KHALILIAN-GOURTANI ,  Neeraj J. GADGIL ,  Guan-Ming Su

IPC: G06V10/762 ,  G06V10/764 ,  G06V10/26 ,  G06V10/28 ,  G06V10/34 ,  G06V10/56

Abstract: A method for image segmentation includes (a) clustering, based upon k-means clustering, pixels of an image into first clusters, (b) outputting a cluster map of the first clusters (c) re-clustering the pixels into a new plurality of non-disjoint pixel-clusters, and (d) classifying the non-disjoint pixel-clusters in categories, according to a user-indicated classification. Another method for image segmentation includes (a) forming a graph with each node of the graph corresponding to a first respective non-disjoint pixel-cluster of the image and connected to each terminal of the graph and to all other nodes corresponding to other respective non-disjoint pixel-clusters that, in the image, are within a neighborhood of the first respective non-disjoint pixel-cluster, (b) setting weights of connections of the graph according to a user-indicated classification in categories respectively associated with the terminals, and (c) segmenting the image into the categories by cutting the graph based upon the weights.

公开(公告)号：US11388408B2

公开(公告)日：2022-07-12

申请号：US17299743

申请日：2019-11-27

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Harshad Kadu ,  Qing Song ,  Guan-Ming Su

IPC: H04N19/132 ,  H04N19/182 ,  H04N19/169 ,  H04N19/98

Abstract: Methods and systems for generating an interpolated reshaping function for the efficient coding of high-dynamic range images are provided. The interpolated reshaping function is constructed based on a set of pre-computed basis reshaping functions. Interpolation schemes are derived for pre-computed basis reshaping functions represented as look-up tables, multi-segment polynomials, or matrices of coefficients in a multivariate, multi-regression representation. Encoders and decoders using asymmetric reshaping and interpolated reshaping functions for mobile applications are also presented.