公开(公告)号：US10917583B2

公开(公告)日：2021-02-09

申请号：US16040400

申请日：2018-07-19

Applicant: Apple Inc.

Inventor： Teun R. Baar ,  Nicolas P. Bonnier ,  Adria Fores Herranz ,  Mahesh B. Chappalli

IPC: H04N5/235 ,  H04N7/01 ,  H04N5/57

Abstract: Aspects of the subject technology relate to display circuitry for displaying both standard dynamic range (SDR) and high dynamic range (HDR) content with an HDR display. The subject technology provides a headroom-based transfer function that maintains the contrast of the SDR content whether the display is operated in the SDR or HDR mode.

公开(公告)号：US20180330674A1

公开(公告)日：2018-11-15

申请号：US15814262

申请日：2017-11-15

Applicant: Apple Inc.

Inventor： Teun R. Baar ,  Nicolas P. Bonnier ,  Jiaying Wu ,  Marc Albrecht

IPC: G09G3/34 ,  H05B37/02 ,  G06T11/00 ,  G06T5/00

CPC classification number: G09G3/3406 ,  G06T5/009 ,  G06T11/001 ,  G09G2320/0242 ,  G09G2320/0271 ,  G09G2320/0626 ,  G09G2320/0666 ,  G09G2330/021 ,  G09G2330/045 ,  G09G2360/144 ,  G09G2360/16 ,  H05B33/086 ,  H05B37/0218

Abstract: An electronic device may be provided with a display. Standard and high dynamic range content may be produced by content generators operating on control circuitry. In a first mode of operation, standard dynamic range content is displayed. In a second mode of operation, high dynamic range content is displayed. In a third mode of operation, standard dynamic range content and high dynamic range content are simultaneously displayed. Tone mapping parameters may be produced by a tone mapping engine for use in displaying the standard and high dynamic range content. The tone mapping parameters may be selected based on factors such as ambient light level, user brightness setting, content statistics, and display characteristics. Tone mapping parameters may be selected to accommodate simultaneous display of standard and high dynamic range content and to accommodate transitions between standard and high dynamic range content.

公开(公告)号：US11233951B2

公开(公告)日：2022-01-25

申请号：US17119224

申请日：2020-12-11

Applicant: Apple Inc.

Inventor： Teun R. Baar ,  Nicolas P. Bonnier ,  Adria Fores Herranz ,  Mahesh B. Chappalli

IPC: H04N5/235 ,  H04N7/01 ,  H04N5/57

Abstract: Aspects of the subject technology relate to display circuitry for displaying both standard dynamic range (SDR) and high dynamic range (HDR) content with an HDR display. The subject technology provides a headroom-based transfer function that maintains the contrast of the SDR content whether the display is operated in the SDR or HDR mode.

公开(公告)号：US10665181B2

公开(公告)日：2020-05-26

申请号：US15907097

申请日：2018-02-27

Applicant: Apple Inc.

Inventor： Marc Albrecht ,  Teun R. Baar ,  Nicolas P. Bonnier ,  Sean Chang ,  ByoungSuk Kim ,  David S. Zalatimo

IPC: G06F1/16 ,  G09G3/34

Abstract: An electronic device may be provided with a display. The display may include a backlight having an array of locally dimmable light sources. Control circuitry may provide control signals to the backlight to produce light at different brightness levels. When the brightness level is below a threshold, the control circuitry may use pulse-width-modulation control signals to control the light sources in the backlight. When the brightness level is above the brightness threshold, the control circuitry may use analog control signals to control the light sources in the backlight. The control circuitry may adjust the threshold to achieve different dimming ranges for different brightness settings. A low brightness setting, for example, may have a lower threshold and lower dimming range than a high brightness setting, which may help produce darker darks when the display operates in a low brightness setting.

公开(公告)号：US10403214B2

公开(公告)日：2019-09-03

申请号：US15814262

申请日：2017-11-15

Applicant: Apple Inc.

Inventor： Teun R. Baar ,  Nicolas P. Bonnier ,  Jiaying Wu ,  Marc Albrecht

IPC: G09G3/34 ,  H05B37/02 ,  G06T5/00 ,  G06T11/00 ,  H05B33/08 ,  H04N1/60 ,  H04N5/57 ,  H04N9/64

Abstract: An electronic device may be provided with a display. Standard and high dynamic range content may be produced by content generators operating on control circuitry. In a first mode of operation, standard dynamic range content is displayed. In a second mode of operation, high dynamic range content is displayed. In a third mode of operation, standard dynamic range content and high dynamic range content are simultaneously displayed. Tone mapping parameters may be produced by a tone mapping engine for use in displaying the standard and high dynamic range content. The tone mapping parameters may be selected based on factors such as ambient light level, user brightness setting, content statistics, and display characteristics. Tone mapping parameters may be selected to accommodate simultaneous display of standard and high dynamic range content and to accommodate transitions between standard and high dynamic range content.

公开(公告)号：US10402952B2

公开(公告)日：2019-09-03

申请号：US15667099

申请日：2017-08-02

Applicant: Apple Inc.

Inventor： Teun R. Baar ,  Jiaying Wu ,  Nicolas P. Bonnier ,  Garrett M. Johnson ,  Paul M. Hubel

IPC: G06T5/00 ,  G06T5/50 ,  G06T5/20

Abstract: Systems, methods, and computer readable media to improve the operation of electronic display systems. Techniques for inverse tone mapping operations for selected standard dynamic range (SDR) images are described. The converted images may be presented on high dynamic range (HDR) displays so as to increase a user's viewing experience (through an expanded dynamic range) while preserving the artistic content of the displayed information. Techniques disclosed herein selectively transform SDR images to HDR images by determining if the SDR images were created from HDR images (e.g., through the fusion of multiple SDR images) and if their quality is such as to permit the conversion without introducing unwanted visual artifacts. The proposed techniques apply a sigmoidal inverse tone mapping function configured to provide a perceptual-based tone mapping. Values for the function's tuning parameters may be set based on what may be determined about the original HDR-to-SDR mapping operation.

公开(公告)号：US20180350047A1

公开(公告)日：2018-12-06

申请号：US15667099

申请日：2017-08-02

Applicant: Apple Inc.

Inventor： Teun R. Baar ,  Jiaying Wu ,  Nicolas P. Bonnier ,  Garrett M. Johnson ,  Paul M. Hubel

IPC: G06T5/00

CPC classification number: G06T5/009 ,  G06T5/20 ,  G06T5/50 ,  G06T2207/10024 ,  G06T2207/20028 ,  G06T2207/20208

Abstract: Systems, methods, and computer readable media to improve the operation of electronic display systems are disclosed. Techniques for inverse tone mapping operations for selected standard dynamic range (SDR) images are described. The converted images may be presented on high dynamic range (HDR) displays so as to increase a user's viewing experience (through an expanded dynamic range) while preserving the artistic content of the displayed information. Techniques disclosed herein selectively transform SDR images to HDR images by determining if the SDR images were created from HDR images (e.g., through the fusion of multiple SDR images) and if their quality is such as to permit the conversion without introducing unwanted visual artifacts. The proposed techniques apply a sigmoidal inverse tone mapping function configured to provide a perceptual-based tone mapping. Values for the function's tuning parameters may be set based on what may be determined about the original HDR-to-SDR mapping operation.