US 11,915,393 B2
Image acquisition method for time of flight camera
Min Hyuk Kim, Daejeon (KR); and Daniel S. Jeon, Daejeon (KR)
Assigned to SK hynix Inc., Icheon-si (KR); and Korea Advanced Institute of Science and Technology, Daejeon (KR)
Filed by SK hynix Inc., Gyeonggi-do (KR); and Korea Advanced Institute of Science and Technology, Daejeon (KR)
Filed on Dec. 2, 2021, as Appl. No. 17/540,632.
Claims priority of application No. 10-2021-0090674 (KR), filed on Jul. 12, 2021.
Prior Publication US 2023/0010725 A1, Jan. 12, 2023
Int. Cl. G06T 5/00 (2006.01); G06T 5/50 (2006.01); G06T 5/40 (2006.01); G06T 7/00 (2017.01); G01S 17/894 (2020.01); H04N 23/80 (2023.01)
CPC G06T 5/002 (2013.01) [G01S 17/894 (2020.01); G06T 5/40 (2013.01); G06T 5/50 (2013.01); G06T 7/0002 (2013.01); H04N 23/80 (2023.01); G06T 2207/10028 (2013.01); G06T 2207/10048 (2013.01); G06T 2207/30168 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An image acquisition method for a Time Of Flight (TOF) camera, the image acquisition method comprising:
acquiring a first image using a first frequency;
acquiring a second image using a second frequency;
producing an initial unwrapped image based on the first and second images;
selecting a partial area from the unwrapped image;
distinguishing one or more erroneously unwrapped pixels of the partial area from remaining pixels of the partial area by comparing the number of unwrapped pixels included in two phase sections; and
moving an erroneously unwrapped pixel from a phase section to which it has been initially unwrapped to another phase section, wherein one of the two phase sections includes fewer unwrapped pixels than the other phase section.