The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 08, 2020
Filed:
Dec. 21, 2016
Koninklijke Philips N.v., Eindhoven, NL;
Mark Jozef Willem Mertens, Eindhoven, NL;
Rutger Nijland, Someren-Eind, NL;
Johannes Gerardus Rijk Van Mourik, Eindhoven, NL;
Johannes Yzebrand Tichelaar, Eindhoven, NL;
Koninklijke Philips N.V., Eindhoven, NL;
Abstract
To enable practical and quick generation of a family of good looking HDR gradings for various displays on which the HDR image may need to be shown, we describe a color transformation apparatus () to calculate resultant colors (R2, G2, B2) of pixels of an output image (IM_MDR) for a display with a display peak brightness (PB_D) starting from input colors (R, G, B) of pixels of an input image (Im_in) having a maximum luma code corresponding to a first image peak brightness (PB_IM1) which is different from the display peak brightness, characterized in that the color transformation apparatus comprises: —a color transformation determination unit () arranged to determine a color transformation (TMF; g) as defined in color processing specification data (MET_1) comprising at least one tone mapping function (CC) received via a metadata input (), which color transformation specifies how the luminances of pixels of the input image are to be converted into luminances for those pixels of a second image (IM_HDR) having corresponding to its maximum luma code a second image peak brightness (PB_IM2), which is different from the display peak brightness (PB_D) and the first image peak brightness (PB_IM1), and whereby the division of the first image peak brightness by the second image peak brightness is either larger than 2 or smaller than ½; —a scaling factor determination unit () arranged to determine a resultant common multiplicative factor (gt; Ls), the unit being arranged to apply determining along a direction (DIR) a position along a metric a position (M_PB_U) which corresponds with the display peak brightness (PB_D) and arranged to determine the resultant common multiplicative factor (gt; Ls) based on the position, and wherein the color transformation apparatus () further comprises: —a scaling multiplier () arranged to multiply each of the three color components of an RGB color representation of the input colors with the resultant common multiplicative factor (gt).