Back to results
US 2023/0143051 A1Published application
Real-time ir fundus image tracking in the presence of artifacts using a reference landmark
AssigneeCarl Zeiss Meditec AG
InventorHomayoun BAGHERINIA
Life of this patent
Estimating the term…
Abstract
A system and method for ophthalmic motion tracking. An anchor point and multiple auxiliary points are selected from a reference image. Individual live images in a series of images are then searched for matches of the anchor point and auxiliary point. First, the anchor point is found, and then searches for individual auxiliary points is limited to a search window defined by the known distance and/or orientation of the sought auxiliary point relative to the anchor point.
Claims25
An eye tracking method, comprising:
- capturing multiple images of the eye, including a reference image and one or more live images;
- defining a reference-anchor point in the reference image;
- defining one or more auxiliary points in the reference image;
- within a select live image:
- a) identifying an initial matching point that matches the reference-anchor point;
- b) searching for a match of a select auxiliary point within a region based on the location of the select auxiliary point relative to the reference anchor point;
- and
- correcting for a tracking error between the reference image and the select live image based on their matched points.
5 more elements
An eye tracking method, comprising:
- capturing multiple images of the retina of an eye, including a reference image and one or more live images;
- identifying a prominent physical feature in the reference image;
- defining a reference-anchor template based on the prominent physical feature;
- defining one or more auxiliary templates based on other physical features in the reference image;
- storing the locations of the auxiliary templates relative to the reference-anchor template;
- within each live image:
- a) identifying an initial matching region that matches the reference-anchor template, the initial matching region defining a corresponding live-anchor template whose position is matched to the position of the reference-anchor template;
- b) searching for a match of the one or more auxiliary templates, each found match defining another corresponding template in the live image, wherein the search for each auxiliary template is limited to a bound region whose location relative to the live-anchor template is based on the stored location of the auxiliary template relative to the reference-anchor template;
- and
- correcting for a tracking error between the reference image and a select live image based on two or more corresponding templates of the reference image and the select live image.
7 more elements
Dependencies are inferred from the claim text.