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1. (WO2017153376) ENCODING AND DECODING HDR VIDEOS

Pub. No.:    WO/2017/153376    International Application No.:    PCT/EP2017/055265
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Wed Mar 08 00:59:59 CET 2017
IPC: H04N 19/30
G06T 5/00
H04N 1/60
Applicants: KONINKLIJKE PHILIPS N.V.
Inventors: STESSEN, Jeroen, Hubert, Christoffel, Jacobus
Title: ENCODING AND DECODING HDR VIDEOS
Abstract:
To have a much better usable pragmatic manner of HDR video encoding and decoding, the inventor invented a high dynamic range video decoder (500) arranged to receive an encoding (Im_COD) of a high dynamic range video and to decode and output a set of temporally successive images (Im_RHDR) comprising: An input (502) to receive three weight values (kRY, kGY, kBY); A video decoder (501) arranged to decode the encoding (Im_COD) into an intermediate image (Im_RLDR) being in a Y'CbCr color representation; A brightness index calculation unit (503) arranged to calculate for each pixel of the intermediate image (Im_RLDR) a brightness index (J') being defined as J'=Y'+MAX{kRY*(R'-Y'), kGY*(G'-Y'), kBY*(B'-Y')}; A brightness mapper (505) arranged to receive a specification of at least one one-dimensional function F_ct, and to apply it with the brightness index (J') as input, to obtain an output brightness index (J*); A multiplication factor calculation unit (506) arranged to calculate a multiplicative factor (g) being equal to the output brightness index (J*) divided by the brightness index (J'); Three multipliers (509, 510, 511) to multiply the respective color components (Y, Cr, Cb) of each pixel of the intermediate image (Im_RLDR) with the multiplicative factor (g), to obtain an output color (Y'H, Cb'H, Cr'H) for that pixel in the output dynamic range image (Im_RHDR) of the set of temporally successive images being currently decoded.