US 12,086,971 B2
Global tone mapping with contrast enhancement and chroma boost
Ibrahim Pekkucuksen, Plano, TX (US); Kaimo Lin, Plano, TX (US); and Hamid R. Sheikh, Allen, TX (US)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Jan. 27, 2022, as Appl. No. 17/586,511.
Claims priority of provisional application 63/231,681, filed on Aug. 10, 2021.
Prior Publication US 2023/0052082 A1, Feb. 16, 2023
Int. Cl. G06T 5/40 (2006.01); G06T 5/92 (2024.01)
CPC G06T 5/92 (2024.01) [G06T 5/40 (2013.01); G06T 2207/10024 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
at least one processing device configured to:
obtain an input image;
determine a cumulative distribution function (CDF) histogram from a luminance or luma (Y) channel of the input image;
determine an entry CDF histogram in a CDF histogram lookup table (LUT) closest to the determined CDF histogram; and
apply a Y channel global tone mapping (GTM) curve to the input image based on one or more parameters assigned to the entry CDF histogram from the CDF histogram LUT.