	US 11,727,546 B2
	Method and device for correcting image
Sihyung Lee, Yongin-si (KR); Dongjae Kim, Suwon-si (KR); Jae Wook Nam, Suwon-si (KR); and Wooram Hong, Yongin-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Gyeonggi-Do (KR); and RESEARCH & BUSINESS FOUNDATION SUNGKYUNKWAN UNIVERSITY, Gyeonggi-Do (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR); and Research & Business Foundation SUNGKYUNKWAN UNIVERSITY, Suwon-si (KR)
Filed on Mar. 9, 2022, as Appl. No. 17/690,853.
Application 17/690,853 is a continuation of application No. 17/084,352, filed on Oct. 29, 2020, granted, now 11,295,420.
Application 17/084,352 is a continuation of application No. 15/902,666, filed on Feb. 22, 2018, granted, now 10,853,922, issued on Dec. 1, 2020.
Claims priority of application No. 10-2017-0025065 (KR), filed on Feb. 24, 2017.
Prior Publication US 2022/0198621 A1, Jun. 23, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G06T 5/00 (2006.01); G06T 5/40 (2006.01); G06T 5/20 (2006.01); H04N 23/70 (2023.01)

CPC G06T 5/006 (2013.01) [G06T 5/008 (2013.01); G06T 5/20 (2013.01); G06T 5/40 (2013.01); H04N 23/70 (2023.01); G06T 2207/10061 (2013.01); G06T 2207/20056 (2013.01); G06T 2207/30164 (2013.01)]

20 Claims

1. A method for correcting an image, the method comprising: orthographically correcting the image; transforming the orthographically corrected image into a frequency region; removing an artifact by applying a first filter to frequency-transformed image; and correcting brightness of the image, from which the artifact is removed, by applying a second filter to the image, from which the artifact is removed, wherein the first filter comprises a first function and a second function for a first domain and a second domain, which are orthogonal to each other in the frequency region and the first filter is differentiable and continuous in the first domain and the second domain, wherein the correcting the brightness comprises: determining a representative value of brightness corresponding to a pixel included in the image from which the artifact is removed by averaging brightness around the pixel; and correcting the representative value of brightness corresponding to the pixel based on an average value of brightness of all pixels in the image from which the artifact is removed.