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:
Mar. 08, 2022
Filed:
Aug. 22, 2019
Koninklijke Philips N.v., Eindhoven, NL;
Renatus Josephus Van Der Vleuten, Veldhoven, NL;
Rutger Nijland, Someren, NL;
Johannes Yzebrand Tichelaar, Eindhoven, NL;
Koninklijke Philips N.V., Eindhoven, NL;
Abstract
At least some applications in the total HDR video chain desire some more sophisticated approach, such as a high dynamic range video encoder (), arranged to receive via an image input () an input high dynamic range image (MsterHDR) which has a first maximum pixel luminance (PB_C_H), the encoder being arranged to receive via a metadata input () a master luma mapping function (FL_), which luma mapping function defines the relationship between normalized lumas of the input high dynamic range image and normalized lumas of a corresponding standard dynamic range image (Im_LDR) having a maximum pixel luminance of preferably 100 nit, characterized in that the encoder further comprises a metadata input () to receive a second maximum pixel luminance (PB_CH), and the encoder further being characterized in that it comprises: —a HDR function generation unit () arranged to apply a standardized algorithm to transform the master luma mapping function (FL_) into a adapted luma mapping function (F_HhCI), which relates normalized lumas of the input high dynamic range image to normalized luminances of an intermediate dynamic range image (IDR) which is characterized by having a maximum possible luminance being equal to the second maximum pixel luminance (PB_CH); an IDR image calculation unit () arranged to apply the adapted luma mapping function (F_HhCI) to lumas of pixels of the input high dynamic range image (MsterHDR) to obtain lumas of pixels of the intermediate dynamic range image (IDR); and an IDR mapping function generator () arranged to derive on the basis of the master luma mapping function (FL_) and the adapted luma mapping function (F_HhCI) a channel luma mapping function (F_IsCI), which defines as output the respective normalized lumas of the standard dynamic range image (Im_LDR) when given as input the respective normalized lumas of the intermediate dynamic range image (IDR); the encoder being further characterized to have as output: the intermediate dynamic range image (IDR), as first metadata the second maximum pixel luminance (PB_CH), as second metadata the channel luma mapping function (F_IsCI); and as third metadata the first maximum pixel luminance (PB_C_H).