WO2023281264A3 - Method and apparatus for conversion of hdr signals - Google Patents

Method and apparatus for conversion of hdr signals Download PDF

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Publication number
WO2023281264A3
WO2023281264A3 PCT/GB2022/051752 GB2022051752W WO2023281264A3 WO 2023281264 A3 WO2023281264 A3 WO 2023281264A3 GB 2022051752 W GB2022051752 W GB 2022051752W WO 2023281264 A3 WO2023281264 A3 WO 2023281264A3
Authority
WO
WIPO (PCT)
Prior art keywords
colour gamut
pixel
source
colour
target
Prior art date
Application number
PCT/GB2022/051752
Other languages
French (fr)
Other versions
WO2023281264A2 (en
Inventor
Andrew Cotton
Simon Thompson
Andrew DUNNE
Original Assignee
British Broadcasting Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Broadcasting Corporation filed Critical British Broadcasting Corporation
Publication of WO2023281264A2 publication Critical patent/WO2023281264A2/en
Publication of WO2023281264A3 publication Critical patent/WO2023281264A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control
    • H04N1/6058—Reduction of colour to a range of reproducible colours, e.g. to ink- reproducible colour gamut
    • H04N1/6061—Reduction of colour to a range of reproducible colours, e.g. to ink- reproducible colour gamut involving the consideration or construction of a gamut surface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control
    • H04N1/6058—Reduction of colour to a range of reproducible colours, e.g. to ink- reproducible colour gamut
    • H04N1/6063—Reduction of colour to a range of reproducible colours, e.g. to ink- reproducible colour gamut dependent on the contents of the image to be reproduced
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

Methods and Apparatus for conversion of HDR signals are described. For example, a method of processing a video signal from a source having a source colour gamut to produce a signal usable by target devices having a target colour gamut is provided. The source colour gamut defines a region that encompasses the target colour gamut. The boundaries of the source colour gamut are defined on a chromaticity diagram by straight lines connecting source colour primaries and the boundaries of the target colour gamut are defined by straight lines connecting target colour primaries. The method comprises receiving the video signal from the source, the video signal comprising a pixel, and converting using a converter that implements the following or an equivalent function. An intermediate colour gamut defining a region in colour space that encompasses the target gamut is provided, in which at least one of the primaries of the intermediate colour gamut lies on a boundary of the source colour gamut and has a hue that is between the hue of a corresponding primary of the source colour gamut and the hue of a corresponding primary of the target gamut. The position of the at least one primary is such that a portion of the source colour gamut lies outside of the intermediate colour gamut ace. Further, the colour components of the pixel are provided, the colour components indicating a position of the pixel on the chromaticity diagram relative to the source colour gamut. The colour components are processed so as to indicate the position of the pixel on the chromaticity diagram relative to the intermediate colour gamut. If the pixel is a chromatic pixel and the processed colour components indicate a position of the pixel in the source colour gamut that lies in the portion of the source colour gamut that is outside of the intermediate colour gamut, the position of the pixel is adjusted to a position on the boundary of the intermediate colour gamut that is between the original position in the source gamut and the boundary of the target colour gamut. The pixel is then converted to provide an output signal in the target colour gamut. The converting the pixel to the target colour gamut comprises, if the pixel is positioned outside of the target colour gamut, adjusting the position of the pixel to a position on the boundary or inside the target colour gamut along a line of constant hue.
PCT/GB2022/051752 2021-07-08 2022-07-07 Method and apparatus for conversion of hdr signals WO2023281264A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2109857.9A GB2608990A (en) 2021-07-08 2021-07-08 Method and apparatus for conversion of HDR signals
GB2109857.9 2021-07-08

Publications (2)

Publication Number Publication Date
WO2023281264A2 WO2023281264A2 (en) 2023-01-12
WO2023281264A3 true WO2023281264A3 (en) 2023-02-09

Family

ID=77353936

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2022/051752 WO2023281264A2 (en) 2021-07-08 2022-07-07 Method and apparatus for conversion of hdr signals

Country Status (2)

Country Link
GB (1) GB2608990A (en)
WO (1) WO2023281264A2 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007024503A1 (en) * 2005-08-25 2007-03-01 Eastman Kodak Company Laser-based display having expanded image color
GB2534929A (en) * 2015-02-06 2016-08-10 British Broadcasting Corp Method and apparatus for conversion of HDR signals
WO2018152063A1 (en) * 2017-02-15 2018-08-23 Dolby Laboratories Licensing Corporation Tone curve mapping for high dynamic range images

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4802991B2 (en) * 2006-11-14 2011-10-26 富士ゼロックス株式会社 Color processing apparatus, color processing method, and program
JP2008172436A (en) * 2007-01-10 2008-07-24 Fuji Xerox Co Ltd Image processing unit, method, and program
KR20130141920A (en) * 2012-06-18 2013-12-27 삼성디스플레이 주식회사 System and method for converting color gamut
US20160351104A1 (en) * 2015-05-29 2016-12-01 Pixtronix, Inc. Apparatus and method for image rendering based on white point correction
GB2539917B (en) * 2015-06-30 2021-04-07 British Broadcasting Corp Method and apparatus for conversion of HDR signals
US10074162B2 (en) * 2016-08-11 2018-09-11 Intel Corporation Brightness control for spatially adaptive tone mapping of high dynamic range (HDR) images
CN108986769B (en) * 2018-09-05 2020-01-14 成都索贝数码科技股份有限公司 Method for maximally restoring content of Rec.2020 color gamut by display equipment with color gamut lower than Rec.2020 color gamut

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007024503A1 (en) * 2005-08-25 2007-03-01 Eastman Kodak Company Laser-based display having expanded image color
GB2534929A (en) * 2015-02-06 2016-08-10 British Broadcasting Corp Method and apparatus for conversion of HDR signals
WO2018152063A1 (en) * 2017-02-15 2018-08-23 Dolby Laboratories Licensing Corporation Tone curve mapping for high dynamic range images

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
FANG HUAMENG ET AL: "Tone mapping based on fast image decomposition and multi-layer fusion", IET COMPUTER VISION, THE INSTITUTION OF ENGINEERING AND TECHNOLOGY, MICHAEL FARADAY HOUSE, SIX HILLS WAY, STEVENAGE, HERTS. SG1 2AY, UK, vol. 9, no. 6, 1 December 2015 (2015-12-01), pages 937 - 942, XP006054302, ISSN: 1751-9632, DOI: 10.1049/IET-CVI.2015.0047 *
JAN FRÖHLICH ET AL: "The SMPTE Meeting Presentation Gamut Mapping for Digital Cinema", 31 October 2013 (2013-10-31), XP055406263, Retrieved from the Internet <URL:http://ieeexplore.ieee.org/ielx7/7269393/7269394/07269395.pdf> [retrieved on 20170913] *
MARCU, GABRIEL G.: "mproving color saturation for color managed images rendered using the perceptual intent", COLOR IMAGING XIII: PROCESSING, HARDCOPY, AND APPLICATIONS, vol. 6807, 28 January 2008 (2008-01-28), XP040431164, DOI: 10.1117/12.774397 *

Also Published As

Publication number Publication date
WO2023281264A2 (en) 2023-01-12
GB202109857D0 (en) 2021-08-25
GB2608990A (en) 2023-01-25

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