US 12,242,169 B2
High-speed autofocus control
Peter DiMeo, Boston, MA (US); Jingyang Yan, Boston, MA (US); and Xian Du, Boston, MA (US)
Assigned to UNIVERSITY OF MASSACHUSETTS, Boston, MA (US)
Filed by UNIVERSITY OF MASSACHUSETTS, Boston, MA (US)
Filed on Mar. 30, 2023, as Appl. No. 18/128,532.
Claims priority of provisional application 63/326,443, filed on Apr. 1, 2022.
Prior Publication US 2023/0314909 A1, Oct. 5, 2023
Int. Cl. G03B 13/36 (2021.01); G03B 3/10 (2021.01); H04N 23/61 (2023.01)
CPC G03B 13/36 (2013.01) [G03B 3/10 (2013.01); H04N 23/61 (2023.01)] 18 Claims
OG exemplary drawing
 
1. A method for autofocusing, comprising:
obtaining a first image of a target with a camera;
adjusting focus of the camera by a specified autofocus (AF) bin step size;
obtaining a second image of the target with the camera;
adjusting focus of the camera by the specified AF bin step size;
obtaining a third image of the target with the camera;
determining an optimal focus based at least in part upon focus measure (FM) data of the second and third images, the optimal focus determined using a direct Gaussian mean calculation; and
adjusting focus of the camera to the optimal focus.