公开(公告)号：US20240244271A1

公开(公告)日：2024-07-18

申请号：US18616959

申请日：2024-03-26

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Robin Atkins ,  Peng Yin ,  Taoran Lu ,  Jaclyn Anne Pytlarz

IPC: H04N19/87 ,  H04N1/60 ,  H04N19/46 ,  H04N19/85 ,  H04N19/98

CPC classification number: H04N19/87 ,  H04N1/6058 ,  H04N19/46 ,  H04N19/85 ,  H04N19/98 ,  G09G2320/06 ,  G09G2340/06

Abstract: In a method to improve backwards compatibility when decoding high-dynamic range images coded in a wide color gamut (WCG) space which may not be compatible with legacy color spaces, hue and/or saturation values of images in an image database are computed for both a legacy color space (say, YCbCr-gamma) and a preferred WCG color space (say, IPT-PQ). Based on a cost function, a reshaped color space is computed so that the distance between the hue values in the legacy color space and rotated hue values in the preferred color space is minimized. HDR images are coded in the reshaped color space. Legacy devices can still decode standard dynamic range images assuming they are coded in the legacy color space, while updated devices can use color reshaping information to decode HDR images in the preferred color space at full dynamic range.

公开(公告)号：US10600166B2

公开(公告)日：2020-03-24

申请号：US16486392

申请日：2018-02-12

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Jaclyn Anne Pytlarz ,  Robin Atkins

IPC: G06T5/00

Abstract: Methods for mapping an image from a first dynamic range to a second dynamic range are presented. The mapping is based on a function that includes two spline polynomials determined using three anchor points and three slopes. The first anchor N point is determined using the black point levels of the input and target output, the second anchor point is determined using the white point levels of the input and target output, and the third anchor point is determined using mid-tones information data for the input and target output. The mid-tones level of the target output is computed adaptively based on an ideal one-to-one mapping and by preserving input contrast in both the blacks and the highlights. An example tone-mapping transfer function based on third order (cubic) Hermite splines is presented.

公开(公告)号：US12200271B1

公开(公告)日：2025-01-14

申请号：US18899400

申请日：2024-09-27

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Robin Atkins ,  Peng Yin ,  Taoran Lu ,  Jaclyn Anne Pytlarz

IPC: H04N19/82 ,  H04N1/60 ,  H04N19/46 ,  H04N19/85 ,  H04N19/87 ,  H04N19/98

Abstract: In a method to improve backwards compatibility when decoding high-dynamic range images coded in a wide color gamut (WCG) space which may not be compatible with legacy color spaces, hue and/or saturation values of images in an image database are computed for both a legacy color space (say, YCbCr-gamma) and a preferred WCG color space (say, IPT-PQ). Based on a cost function, a reshaped color space is computed so that the distance between the hue values in the legacy color space and rotated hue values in the preferred color space is minimized. HDR images are coded in the reshaped color space. Legacy devices can still decode standard dynamic range images assuming they are coded in the legacy color space, while updated devices can use color reshaping information to decode HDR images in the preferred color space at full dynamic range.

公开(公告)号：US20240283983A1

公开(公告)日：2024-08-22

申请号：US18630786

申请日：2024-04-09

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Robin Atkins ,  Peng Yin ,  Taoran Lu ,  Jaclyn Anne Pytlarz

IPC: H04N19/87 ,  H04N1/60 ,  H04N19/46 ,  H04N19/85 ,  H04N19/98

CPC classification number: H04N19/87 ,  H04N1/6058 ,  H04N19/46 ,  H04N19/85 ,  H04N19/98 ,  G09G2320/06 ,  G09G2340/06

Abstract: In a method to improve backwards compatibility when decoding high-dynamic range images coded in a wide color gamut (WCG) space which may not be compatible with legacy color spaces, hue and/or saturation values of images in an image database are computed for both a legacy color space (say, YCbCr-gamma) and a preferred WCG color space (say, IPT-PQ). Based on a cost function, a reshaped color space is computed so that the distance between the hue values in the legacy color space and rotated hue values in the preferred color space is minimized. HDR images are coded in the reshaped color space. Legacy devices can still decode standard dynamic range images assuming they are coded in the legacy color space, while updated devices can use color reshaping information to decode HDR images in the preferred color space at full dynamic range.

公开(公告)号：US20240249701A1

公开(公告)日：2024-07-25

申请号：US18694366

申请日：2022-09-28

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Shruthi Suresh Rotti ,  Jaclyn Anne Pytlarz ,  Robin Atkins ,  Subhadra Gopalakrishnan

IPC: G09G5/10

CPC classification number: G09G5/10 ,  G09G2320/0233

Abstract: Methods and systems for multi-step display mapping and metadata reconstruction for high-dynamic range (HDR) images are described. In an encoder, given an HDR input image with input HDR metadata in a first dynamic range, an intermediate, base layer image in a second dynamic range is constructed based on the input image. In a decoder, using base-layer metadata, the input HDR metadata, and dynamic range characteristics of a target display, a processor generates reconstructed metadata which when used in combination with the base layer image allow a display mapping process to map the base layer image to the target display as if it was mapping directly the HDR image to the target display.

公开(公告)号：US11924477B2

公开(公告)日：2024-03-05

申请号：US18215129

申请日：2023-06-27

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Robin Atkins ,  Peng Yin ,  Taoran Lu ,  Jaclyn Anne Pytlarz

IPC: H04N19/87 ,  H04N1/60 ,  H04N19/46 ,  H04N19/85 ,  H04N19/98

CPC classification number: H04N19/87 ,  H04N1/6058 ,  H04N19/46 ,  H04N19/85 ,  H04N19/98 ,  G09G2320/06 ,  G09G2340/06

Abstract: In a method to improve backwards compatibility when decoding high-dynamic range images coded in a wide color gamut (WCG) space which may not be compatible with legacy color spaces, hue and/or saturation values of images in an image database are computed for both a legacy color space (say, YCbCr-gamma) and a preferred WCG color space (say, IPT-PQ). Based on a cost function, a reshaped color space is computed so that the distance between the hue values in the legacy color space and rotated hue values in the preferred color space is minimized. HDR images are coded in the reshaped color space. Legacy devices can still decode standard dynamic range images assuming they are coded in the legacy color space, while updated devices can use color reshaping information to decode HDR images in the preferred color space at full dynamic range.

公开(公告)号：US11910025B1

公开(公告)日：2024-02-20

申请号：US18385724

申请日：2023-10-31

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Robin Atkins ,  Peng Yin ,  Taoran Lu ,  Jaclyn Anne Pytlarz

IPC: H04N19/87 ,  H04N19/46 ,  H04N19/98 ,  H04N19/85 ,  H04N1/60

CPC classification number: H04N19/87 ,  H04N1/6058 ,  H04N19/46 ,  H04N19/85 ,  H04N19/98 ,  G09G2320/06 ,  G09G2340/06

Abstract: In a method to improve backwards compatibility when decoding high-dynamic range images coded in a wide color gamut (WCG) space which may not be compatible with legacy color spaces, hue and/or saturation values of images in an image database are computed for both a legacy color space (say, YCbCr-gamma) and a preferred WCG color space (say, IPT-PQ). Based on a cost function, a reshaped color space is computed so that the distance between the hue values in the legacy color space and rotated hue values in the preferred color space is minimized HDR images are coded in the reshaped color space. Legacy devices can still decode standard dynamic range images assuming they are coded in the legacy color space, while updated devices can use color reshaping information to decode HDR images in the preferred color space at full dynamic range.

公开(公告)号：US11711486B2

公开(公告)日：2023-07-25

申请号：US17253600

申请日：2019-06-13

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Elizabeth G. Pieri ,  Robin Atkins ,  Jaclyn Anne Pytlarz

IPC: H04N5/58 ,  H04N1/60 ,  H04N9/64 ,  H04N9/79 ,  H04N23/71 ,  H04N23/75 ,  H04N5/57 ,  H04N5/20 ,  H04N5/202

CPC classification number: H04N5/58 ,  H04N1/6088 ,  H04N5/20 ,  H04N5/202 ,  H04N5/57 ,  H04N9/643 ,  H04N9/79 ,  H04N23/71 ,  H04N23/75

Abstract: Methods and systems are described for processing an image captured with an image sensor, such as a camera. In one embodiment, an estimated ambient light level of the captured image is determined and used to compute an optical-optical transfer function (OOTF) that is used to correct the image to preserve an apparent contrast of the image under the estimated ambient light level in a viewing environment. The estimated ambient light level is determined by scaling pixel values from the image sensor using a function that includes exposure parameters and a camera specific parameter derived from a camera calibration.

公开(公告)号：US20230120882A1

公开(公告)日：2023-04-20

申请号：US17992603

申请日：2022-11-22

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Robin Atkins ,  Peng Yin ,  Taoran Lu ,  Jaclyn Anne Pytlarz

IPC: H04N19/87 ,  H04N19/46 ,  H04N19/98 ,  H04N19/85 ,  H04N1/60

Abstract: In a method to improve backwards compatibility when decoding high-dynamic range images coded in a wide color gamut (WCG) space which may not be compatible with legacy color spaces, hue and/or saturation values of images in an image database are computed for both a legacy color space (say, YCbCr-gamma) and a preferred WCG color space (say, IPT-PQ). Based on a cost function, a reshaped color space is computed so that the distance between the hue values in the legacy color space and rotated hue values in the preferred color space is minimized HDR images are coded in the reshaped color space. Legacy devices can still decode standard dynamic range images assuming they are coded in the legacy color space, while updated devices can use color reshaping information to decode HDR images in the preferred color space at full dynamic range.

公开(公告)号：US11594159B2

公开(公告)日：2023-02-28

申请号：US17421972

申请日：2020-01-09

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Robin Atkins ,  Craig Todd ,  Jaclyn Anne Pytlarz ,  Timo Kunkel

IPC: G09G3/00 ,  G02B5/20

Abstract: A display apparatus, a display management module and a method for ambient light compensation are described. The display management module is configured to receive an input video signal comprising a sequence of video frames and to determine whether a current video frame of the sequence of video frames immediately follows a scene change. The display management module is further configured to adjust ambient light compensation applied to the input signal in dependence on the signal indicative of intensity of ambient light only in response to determining that the current video frame of the sequence of video frames immediately follows a scene change.