US 12,217,399 B2
Tone mapping circuit, image sensing device and operation method thereof
Chang Ki Min, Gyeonggi-do (KR)
Assigned to SK hynix Inc., Gyeonggi-do (KR)
Filed by SK hynix Inc., Gyeonggi-do (KR)
Filed on Sep. 20, 2021, as Appl. No. 17/479,229.
Claims priority of application No. 10-2021-0041954 (KR), filed on Mar. 31, 2021.
Prior Publication US 2022/0318955 A1, Oct. 6, 2022
Int. Cl. G06T 5/70 (2024.01); G06T 5/50 (2006.01)
CPC G06T 5/70 (2024.01) [G06T 5/50 (2013.01); G06T 2207/10024 (2013.01)] 11 Claims
OG exemplary drawing
 
10. A method for driving an image sensing device, comprising:
generating a corrected color image based on a weight matrix and pixel data representing an input image provided from a pixel array; and
generating an output image by removing a noise from the corrected color image based on the input image and the corrected color image,
wherein the generating the output image includes:
calculating a mean value of the pixel data;
calculating a deviation of the input image by subtracting the mean value of the pixel data from each piece of the pixel data;
calculating a mean value of the corrected color image; and
removing the noise from the corrected color image by adding the deviation of the input image to the mean value of the corrected color image.