US 12,079,972 B2
Method and apparatus based on scene dependent lens shading correction
Seongjun Park, San Jose, CA (US); Shuangquan Wang, San Diego, CA (US); Dongwoon Bai, San Diego, CA (US); and Jungwon Lee, San Diego, CA (US)
Assigned to Samsung Electronics Co., Ltd, (KR)
Filed by Samsung Electronics Co., Ltd., Gyeonggi-do (KR)
Filed on Jan. 10, 2022, as Appl. No. 17/572,223.
Claims priority of provisional application 63/187,013, filed on May 11, 2021.
Prior Publication US 2022/0375044 A1, Nov. 24, 2022
Int. Cl. G06K 9/40 (2006.01); G06T 5/40 (2006.01); G06T 5/80 (2024.01); H04N 23/88 (2023.01)
CPC G06T 5/80 (2024.01) [G06T 5/40 (2013.01); H04N 23/88 (2023.01)] 20 Claims
OG exemplary drawing
 
11. A system for performing scene-dependent lens shading correction (SD-LSC), the system comprising:
a memory configured to store instructions; and
a processor configured to execute the instructions stored in the memory which, upon execution, cause the processor to:
collect scene information from a Bayer thumbnail of an input image;
generate a standard red green blue (sRGB) thumbnail by processing the Bayer thumbnail of the input image to simulate white balance (WB) and pre-gamma blocks;
determine a representative color channel ratio of the input image based on the scene information and the sRGB thumbnail;
determine an ideal grid gain of the input image based on the representative color channel ratio and a grid gain of the input image;
merge the ideal grid gain and the grid gain of the input image to generate a new grid gain; and
apply the new grid gain to the input image.