Title:
SIGNAL RESHAPING FOR HIGH DYNAMIC RANGE SIGNALS
Document Type and Number:
WIPO Patent Application WO/2017/024042
Kind Code:
A3
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.
Inventors:
ATKINS ROBIN (US)
YIN PENG (US)
LU TAORAN (US)
PUTLARZ JACLYN ANNE (US)
YIN PENG (US)
LU TAORAN (US)
PUTLARZ JACLYN ANNE (US)
Application Number:
PCT/US2016/045362
Publication Date:
March 09, 2017
Filing Date:
August 03, 2016
Export Citation:
Assignee:
DOLBY LABORATORIES LICENSING CORP (US)
International Classes:
H04N19/46; H04N19/117; H04N19/186; H04N19/85; H04N19/98
Domestic Patent References:
| WO2012142285A2 | 2012-10-18 |
Foreign References:
| EP0586204A1 | 1994-03-09 | |||
| US6335983B1 | 2002-01-01 |
Other References:
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ANDRIVON P ET AL: "SEI message for Colour Mapping Information", 17. JCT-VC MEETING; 27-3-2014 - 4-4-2014; VALENCIA; (JOINT COLLABORATIVE TEAM ON VIDEO CODING OF ISO/IEC JTC1/SC29/WG11 AND ITU-T SG.16 ); URL: HTTP://WFTP3.ITU.INT/AV-ARCH/JCTVC-SITE/,, no. JCTVC-Q0074-v4, 2 April 2014 (2014-04-02), XP030115975
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ANDRIVON P ET AL: "SEI message for Colour Mapping Information", 17. JCT-VC MEETING; 27-3-2014 - 4-4-2014; VALENCIA; (JOINT COLLABORATIVE TEAM ON VIDEO CODING OF ISO/IEC JTC1/SC29/WG11 AND ITU-T SG.16 ); URL: HTTP://WFTP3.ITU.INT/AV-ARCH/JCTVC-SITE/,, no. JCTVC-Q0074-v4, 2 April 2014 (2014-04-02), XP030115975
BOYCE J ET AL: "Edition 2 Draft Text of High Efficiency Video Coding (HEVC), Including Format Range (RExt), Scalability (SHVC), and Multi-View (MV-HEVC) Extensions", 18. JCT-VC MEETING; 30-6-2014 - 9-7-2014; SAPPORO; (JOINT COLLABORATIVE TEAM ON VIDEO CODING OF ISO/IEC JTC1/SC29/WG11 AND ITU-T SG.16 ); URL: HTTP://WFTP3.ITU.INT/AV-ARCH/JCTVC-SITE/,, no. JCTVC-R1013-v4, 13 August 2014 (2014-08-13), XP030116700
Attorney, Agent or Firm:
KONSTANTINIDES, Konstantinos et al. (US)
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