US 11,941,791 B2
High-dynamic-range image generation with pre-combination denoising
Jon S. McElvain, Manhattan Beach, CA (US); Walter C. Gish, Oak Park, CA (US); Gregory John Ward, Berkeley, CA (US); and Robin Atkins, Vancouver (CA)
Assigned to Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
Appl. No. 17/601,529
Filed by Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
PCT Filed Apr. 9, 2020, PCT No. PCT/US2020/027439
§ 371(c)(1), (2) Date Oct. 5, 2021,
PCT Pub. No. WO2020/210472, PCT Pub. Date Oct. 15, 2020.
Claims priority of provisional application 62/832,617, filed on Apr. 11, 2019.
Claims priority of application No. 19168612 (EP), filed on Apr. 11, 2019.
Prior Publication US 2022/0198625 A1, Jun. 23, 2022
Int. Cl. G06T 5/20 (2006.01); G06T 5/50 (2006.01); H04N 23/741 (2023.01)
CPC G06T 5/92 (2024.01) [G06T 5/20 (2013.01); G06T 5/50 (2013.01); G06T 5/70 (2024.01); H04N 23/741 (2023.01); G06T 2207/20208 (2013.01); G06T 2207/20221 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for generating a high-dynamic-range (HDR) image, comprising:
denoising a short-exposure-time image, wherein denoising comprises
applying a first guided filter to the short-exposure-time image, the guided filter utilizing a long-exposure-time image as its guide,
after the step of denoising, applying a second guided filter to the long-exposure-time image, the second guided filter utilizing the short-exposure-time image as its guide, and scaling at least one of the short-exposure-time image and the long-exposure-time image to place the short-exposure-time image and the long-exposure-time image on a common radiance scale; and
after the step of scaling, merging the short-exposure-time image with the long-exposure-time image to generate the HDR image.