US 12,462,359 B2
Display-optimized HDR video contrast adaptation
Rutger Nijland, Someren (NL)
Assigned to Koniklijke Philips N.V., Eindhoven (NL)
Appl. No. 18/289,593
Filed by KONINKLIJKE PHILIPS N.V., Eindhoven (NL)
PCT Filed Apr. 28, 2022, PCT No. PCT/EP2022/061322
§ 371(c)(1), (2) Date Nov. 6, 2023,
PCT Pub. No. WO2022/233697, PCT Pub. Date Nov. 10, 2022.
Claims priority of application No. 21172666 (EP), filed on May 7, 2021.
Prior Publication US 2024/0257323 A1, Aug. 1, 2024
Int. Cl. G06T 5/92 (2024.01); H04N 21/485 (2011.01)
CPC G06T 5/92 (2024.01) [H04N 21/4854 (2013.01); G06T 2207/10016 (2013.01); G06T 2207/20208 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method comprising:
obtaining a correction value;
obtaining an input image,
wherein the input image has input luminances,
wherein the input luminances, wherein the input image luminances lie within an input dynamic range,
wherein the input dynamic range has an input maximum luminance;
obtaining a reference luminance mapping function, wherein the reference luminance mapping function is associated with the input image,
wherein the reference luminance mapping function specifies a relationship between input luminances and reference luminances,
wherein the reference luminances have a reference maximum luminance;
determining an adjusted maximum luminance value by subtracting the correction value from an output maximum luminance, wherein the output maximum luminance is the maximum luminance of an output image;
determining a locus of points so as to form an adapted luminance mapping function,
wherein each point on the locus is a point on a metric,
wherein the metric has a first endpoint and a second endpoint,
wherein the first endpoint is on the reference luminance mapping function,
wherein the second endpoint is on a diagonal,
wherein the locus of points depends on the adjusted maximum luminance; and
applying the adapted luminance mapping function to the input luminances so as to obtain output luminances of the output image.