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：US11875719B2

公开(公告)日：2024-01-16

申请号：US17611072

申请日：2020-05-12

Applicant: Dolby Laboratories Licensing Corporation

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

IPC: G09G3/20 ,  G09G5/10 ,  G09G5/06 ,  H04N1/60 ,  G09G5/02 ,  H04N5/57 ,  H04N9/67 ,  H04N9/69 ,  H04N9/73

CPC classification number: G09G3/2003 ,  G09G5/10 ,  G09G2320/0666 ,  G09G2320/0693 ,  G09G2340/02 ,  G09G2340/06 ,  G09G2354/00

Abstract: Two corresponding color patches are displayed on two image displays until adjusted by a viewer to match visually to a common color. Two sets of code values rendered on the two corresponding color patches on the two image displays are identified. Two sets of tristimulus values for the viewer are determined based on the two sets of code values rendered on the two corresponding color patches on the two image displays. The viewer's color matching function are generated based on the two sets of tristimulus values. The viewer's CMF is used in image rendering operations on a target image display.

公开(公告)号：US11869455B2

公开(公告)日：2024-01-09

申请号：US18010306

申请日：2021-06-30

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Elizabeth G. Pieri ,  Jaclyn Anne Pytlarz ,  Jake William Zuena

IPC: G09G5/10

CPC classification number: G09G5/10 ,  G09G2360/144 ,  G09G2360/16

Abstract: Novel methods and systems for compensating for ambient light around displays are disclosed. A shift in the PQ curve applied to an image can compensate for sub-optimal ambient light conditions for a display, with the PQ shift being either an addition to a compensation value in PQ space followed by a subtraction of the compensation value in linear space, or an addition to the compensation value in linear space followed by a subtraction of the compensation value in PQ space. Further adjustments to the PQ curve can also be made to provide an improved image quality with respect to image luminance.

公开(公告)号：US11803948B2

公开(公告)日：2023-10-31

申请号：US17605557

申请日：2020-04-16

Applicant: Dolby Laboratories Licensing Corporation

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

IPC: G06T5/00 ,  G06T11/00 ,  G06T7/00 ,  G09G5/02 ,  G09G5/10 ,  G09G5/30 ,  H04N1/60 ,  H04N5/57 ,  H04N9/73 ,  H04N9/77 ,  H04N23/741

CPC classification number: G06T5/009 ,  G06T2207/10024 ,  G06T2207/20016 ,  G06T2207/20208

Abstract: Methods and systems for the display management of HDR video signals are presented. The mapping is based on tone mapping and color volume mapping which map an input signal with an input dynamic range and color volume to a target display with a target dynamic range and color volume. Both a global tone-mapping and precision-mapping methods using pyramid filtering are presented.

公开(公告)号：US11019302B2

公开(公告)日：2021-05-25

申请号：US16650821

申请日：2018-09-27

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Jaclyn Anne Pytlarz ,  Robin Atkins ,  Elizabeth G. Pieri ,  Alexandre Chapiro ,  Scott Daly

IPC: H04N7/01

Abstract: Methods for encoding and decoding high-dynamic range signals are presented. The signals are encoded in a high frame rate and are accompanied by frame-rate conversion metadata defining a preferred set of frame-rate down-conversion parameters, which are determined according to the maximum luminance of a target display, display playback priority modes, or judder control modes. A decoder uses the frame-rate conversion metadata to apply frame-rate down-conversion to the input high-frame-rate signal according to at least the maximum luminance of the target display and/or the characteristics of the signal itself. Frame-based and pixel-based frame-rate conversions, and judder models for judder control via metadata are also discussed.