US 12,402,781 B2
Focus control device, operation method of focus control device, and storage medium
Koichiro Yoshino, Mitaka (JP)
Assigned to OLYMPUS CORPORATION, Tokyo (JP)
Filed by OLYMPUS CORPORATION, Tokyo (JP)
Filed on Jul. 15, 2022, as Appl. No. 17/865,653.
Application 17/865,653 is a continuation of application No. PCT/JP2020/001892, filed on Jan. 21, 2020.
Prior Publication US 2022/0346636 A1, Nov. 3, 2022
Int. Cl. A61B 1/00 (2006.01); G02B 7/09 (2021.01); G02B 23/24 (2006.01); G06T 7/00 (2017.01)
CPC A61B 1/00188 (2013.01) [A61B 1/00096 (2013.01); G02B 23/243 (2013.01); G06T 7/0012 (2013.01); G06T 2207/10068 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A focus control device comprising:
one or more processors configured to:
acquire images from an endoscope, the endoscope including a focus lens configured to change an in-focus object plane position of an in-vivo image, and an imaging element configured to capture light and output signal based on the captured light, wherein the images from the endoscope are generated based on the signal;
detect target object information from the images;
analyze detection results of a target object in time sequence to determine whether the target object is in a lost state in which the target object is not temporarily captured in the images;
control the focus lens of the endoscope to automatically focus on the target object in a case where the target object is detected;
arrange the focus lens at a first fixed position that is within a set range of an in-focus object plane position and is on the far point side of a central position in a case where the target object is not detected and is not in the lost state; and
set the focus lens of the endoscope at a second fixed position that is nearer to a near point than the first fixed position or control the focus lens of the endoscope so as to automatically focus on the target object in a case where the lost state is determined.