US Patent 11108946 Focus stabilization of imaging system with variable focus lens

A method and apparatus for the focus stabilization of an imaging system with variable focus lenses is disclosed herein. As example imaging system includes a variable focus (VF) lens for imaging an object of interest (OOI), a controller configured to provide a voltage to the VF lens, an imaging sensor, and a processor. The processor obtains a calibration parameter, and the imaging system obtains a plurality of images of the OOI. The processor identifies a region of interest of one or more of the images, and an alignment parameter is determined from the images. The processor then determines a tuning parameter from comparing the determined alignment parameter with the obtained calibration parameter. The controller tunes the VF lens according to the determined tuning parameter.