US 11,887,282 B2
Noise removing circuit, image sensing device and operation method of the same
Dong Ik Kim, Gyeonggi-do (KR); Jin Su Kim, Gyeonggi-do (KR); Chang Ki Min, Gyeonggi-do (KR); and Seong Hee Park, Gyeonggi-do (KR)
Assigned to SK hynix Inc., Gyeonggi-do (KR)
Filed by SK hynix Inc., Gyeonggi-do (KR)
Filed on Mar. 30, 2023, as Appl. No. 18/192,663.
Application 18/192,663 is a continuation of application No. 17/151,407, filed on Jan. 18, 2021, granted, now 11,651,476.
Claims priority of application No. 10-2020-0088940 (KR), filed on Jul. 17, 2020.
Prior Publication US 2023/0237624 A1, Jul. 27, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G06T 5/00 (2006.01); G06T 5/50 (2006.01); G06T 5/20 (2006.01); H04N 5/265 (2006.01); H04N 23/741 (2023.01)
CPC G06T 5/002 (2013.01) [G06T 5/009 (2013.01); G06T 5/20 (2013.01); G06T 5/50 (2013.01); H04N 5/265 (2013.01); H04N 23/741 (2023.01); G06T 2207/20208 (2013.01); G06T 2207/30168 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A noise removing circuit, comprising:
an image combiner suitable for generating a high dynamic range (HDR) image by combining images having different exposure times;
a detailed image generator suitable for generating a detailed image from the HDR image;
an image strength evaluator suitable for evaluating strength of the detailed image; and
a noise coring component suitable for performing a noise coring operation for removing noise from a region of the detailed image in which a signal to noise ratio (SNR) has decreased using a low threshold and a saturation threshold when the strength of the detailed image is less than a reference value,
wherein the noise coring component adjusts a noise coring strength using a coring width parameter in a first region in which a long exposure image and a middle exposure image overlap and a second region in which the middle exposure image and a short exposure image overlap.