公开(公告)号：US10242627B2

公开(公告)日：2019-03-26

申请号：US15571369

申请日：2016-05-11

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Suzanne Farrell ,  Scott Daly ,  Robin Atkins ,  Timo Kunkel ,  Gregory John Ward ,  Samir N. Hulyalkar ,  Ning Xu

IPC: G09G3/34 ,  G06K9/00 ,  G09G3/36

Abstract: Systems and methods are disclosed for dynamically adjusting the backlight of a display during video playback. Given an input video stream and associated minimum, average, or maximum luminance values of the video frames in the video stream, values of a function of the frame min, mid, or max luminance values are filtered using a temporal filter to generate a filtered output value for each frame. The instantaneous dynamic range of a target display is determined based on the filtered output value and the minimum and maximum brightness values of the display. A backlight control level is computed based on the instantaneous dynamic range, and the input signal is tone mapped by a display management process to be displayed on the target display at the selected backlight level. The design of a temporal filter based on an exponential moving average filter and scene-change detection is presented.

公开(公告)号：US10607324B2

公开(公告)日：2020-03-31

申请号：US15564188

申请日：2016-04-26

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Suzanne Farrell ,  Scott Daly ,  Timo Kunkel

IPC: G06T5/00 ,  G06T7/90

Abstract: A highlight mask is generated for an image to identify one or more highlights in the image. One or more highlight classifiers are determined for the one or more highlights in the image. One or more highlight gains are applied with the highlight mask to luminance amplitudes of pixels in the one or more highlights in the image to generate a scaled image. The one or more high-light gains for the one or more highlights are determined based at least in part on the one or more highlight classifiers determined for the one or more highlights.

公开(公告)号：US12170815B2

公开(公告)日：2024-12-17

申请号：US18000773

申请日：2021-06-09

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Robin Atkins ,  Suzanne Farrell ,  Per Jonas Andreas Klittmark

IPC: H04N21/4402 ,  H04N21/435 ,  H04N21/442 ,  H04N21/81

Abstract: The described embodiments include systems and methods for producing and adapting images, such as video images, for presentation on display devices that have various different aspects ratios, such as 4:3, 16:9, 9:16, etc. In one embodiment, a method for producing content, such as video images, can begin by selecting an original aspect ratio and determining, within at least a first scene in the content, a position of a subject in the first scene. In one embodiment, the original aspect ratio can be substantially square (e.g., 1:1). Metadata can then be created, based on the position of the subject in the first scene, to guide playback devices to asymmetrically crop the content, relative to the position, for display on display devices that have aspect ratios that are different than the original aspect ratio. Other methods and systems are also described.

公开(公告)号：US10062333B2

公开(公告)日：2018-08-28

申请号：US15286126

申请日：2016-10-05

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Suzanne Farrell ,  Scott Daly ,  Robin Atkins ,  Timo Kunkel ,  Kimball Darr Thurston, III

IPC: G09G5/10 ,  G09G3/34 ,  G06K9/00

CPC classification number: G09G3/3406 ,  G06K9/00711 ,  G09G3/34 ,  G09G3/36 ,  G09G2310/0235 ,  G09G2320/0233 ,  G09G2320/0247 ,  G09G2320/0271 ,  G09G2320/0276 ,  G09G2320/064 ,  G09G2320/0646 ,  G09G2320/0653 ,  G09G2320/066 ,  G09G2320/103 ,  G09G2340/16 ,  G09G2360/16 ,  G09G2370/04

Abstract: Systems and methods are disclosed for dynamically adjusting the backlight of a display during video playback or for generating filtered video metadata. Given an input video stream and associated metadata values of minimum, average, or maximum luminance values of the video frames in the video stream, values of a function of the frame min, mid, or max luminance values are filtered using a temporal filter to generate a filtered output value for each frame. At least one filtering coefficient of the temporal filter is adapted based on a logistic function controlled by slope and sensitivity values. The instantaneous dynamic range of a target display is determined based on the filtered metadata values and the minimum and maximum brightness values of the display.