US 12,118,696 B2
Image signal processor, method for operating image signal processor and image sensing device
So Jin Moon, Seoul (KR); and Hyoung Seok Ko, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on May 27, 2022, as Appl. No. 17/827,101.
Claims priority of application No. 10-2021-0164986 (KR), filed on Nov. 26, 2021.
Prior Publication US 2023/0169629 A1, Jun. 1, 2023
Int. Cl. G06K 9/00 (2022.01); G06T 5/70 (2024.01); G06T 5/73 (2024.01); H04N 25/60 (2023.01); G06T 5/20 (2006.01)
CPC G06T 5/70 (2024.01) [G06T 5/73 (2024.01); H04N 25/60 (2023.01); G06T 5/20 (2013.01); G06T 2207/20192 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An image signal processor comprising:
a gradation detection module configured to receive a pixel signal from an external device; and
a correction module connected to the gradation detection module and configured to receive the pixel signal, wherein:
the gradation detection module is configured to:
estimate a gradient of the pixel signal;
correct the pixel signal based on the gradient to generate a corrected pixel signal;
calculate a first variance value based on the pixel signal;
calculate a second variance value based on the corrected pixel signal;
calculate a gradation probability value based on a comparison result between the first variance value and the second variance value; and
generate a gradation map as information about the gradation probability value of the pixel signal, and
the correction module is configured to correct the pixel signal based on the gradation map.