US 11,750,783 B2
Demosaic operation circuit, image sensing device and operation method of the same
Su Ram Cha, Gyeonggi-do (KR)
Assigned to SK hynix Inc., Gyeonggi-do (KR)
Filed by SK hynix Inc., Gyeonggi-do (KR)
Filed on Jan. 13, 2021, as Appl. No. 17/147,966.
Claims priority of application No. 10-2020-0088976 (KR), filed on Jul. 17, 2020.
Prior Publication US 2022/0021857 A1, Jan. 20, 2022
Int. Cl. H04N 9/73 (2023.01); H04N 9/04 (2006.01); G06T 3/40 (2006.01)
CPC H04N 9/73 (2013.01) [G06T 3/4015 (2013.01); G06T 3/4038 (2013.01); H04N 9/04515 (2018.08); H04N 9/04555 (2018.08); H04N 9/735 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A demosaic operation circuit, comprising:
a white pixel value estimation circuit suitable for acquiring an RGB channel average value and a directional gradient value of a white pixel for each direction using source pixel data provided from a pixel array having a plurality of pixels, and estimating a white pixel value based on the RGB channel average value and the directional gradient value of the white pixel for each direction;
a fine adjustment circuit suitable for finely adjusting an estimated white pixel value by removing a noise through a different filter based on weight values which are differently allocated according to a gradient of a center pixel and a neighboring white pixel;
a chroma estimation circuit suitable for estimating a chroma for each channel by calculating a chroma array based on the source pixel data and a finely adjusted white pixel value; and
a color correction circuit suitable for correcting a color based on the finely adjusted white pixel value and the chroma for each channel.