×

Fast auto-focus in imaging

  • US 10,462,351 B2
  • Filed: 10/03/2017
  • Issued: 10/29/2019
  • Est. Priority Date: 02/01/2011
  • Status: Active Grant
First Claim
Patent Images

1. A method for automatically focusing multiple images of one or more objects on a substrate, the method comprising:

  • a) obtaining, by one or more processing devices, a representative focal distance for a first location on the substrate based on a set of focal distances at known locations on the substrate;

    b) acquiring, by an image acquisition device, a set of at least two images of the first location based on the representative focal distance, wherein the set of images comprises at least a first image that is acquired under illumination of a first color, and at least a second image that is acquired under illumination of a second color that is different from the first color, and wherein each of one or more images under a particular color is acquired using a focal distance at a corresponding offset from the representative focal distance;

    c) estimating, by the one or more processing devices, an ideal focal distance based on the acquired set of images; and

    d) storing the estimated ideal focal distance and the first location in the set of focal distances at known locations.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×