Patent ID: 11965775
Assignee: OPHIR OPTRONICS SOLUTIONS LTD.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G

Claim 0:
1. A method for correcting the focus of an image, comprising:
providing at least one imaging device defining at least one first focal plane Py and at least one second focal plane Px, wherein the at least one imaging device includes at least one image sensor configured to capture one or more images of one or more scattered light signals scattered through Rayleigh scattering from at least one laser beam propagating through at least one sampling region, wherein the at least one imaging device includes at least one in-focus modulation transfer function H(ξ);
providing at least one image processing module having at least one display, wherein the at least one image processing module is in communication with the at least one imaging device;
with the at least one image sensor of the at least one imaging device:
capturing at least one in-focus image in the first focal plane Py of a first scattered light signal; and
capturing at least one out-of-focus image in the second focal plane Px of a second scattered light signal;

with the at least one image processing module in communication with the at least one imaging device:
generating one or more slices of the at least one in-focus image by scanning the at least one in-focus image with at least one cursor at one or more cursor positions;
determining at least one first axis B1 of the at least one in-focus image in the at least one first focal plane Py;
computing a computed distance, d, from a center of each of the one or more slices to the second focal plane Px, and assigning values of the computed distances from each respective slice, wherein the center of each of the one or more slices is defined relative to the at least one in-focus image;
determining at least one out-of-focus transfer function G(ξ,d) for each of the one or more slices using the assigned values of the computed distances;
deconvolving each slice of the in-focus image against the in-focus modulation transfer function H(ξ) and the out-of-focus transfer function G(ξ,d);
outputting at least one corrected image to the at least one display of the at least one image processing module; and
using the at least one corrected image to calculate a width of at least one beam waist shown in the at least one corrected image.