Custom eyeglass manufacturing method
View Patent ↗Two or more images captured from digital cameras record an image of spectacle frames on a subject. The image is analyzed using automated image-processing techniques to identify the relation of specific points of interest on the frame to the location of each of the subject's eyes allowing the optical center of the lens to be placed in the correct location in the frames.
1. A spectacle frame fitting system, the system comprising:
an imager configured to capture a front image and a side image of a subject field;
an image processor configured to receive and analyze the front image and the side image to determine a pupil position relative to a spectacle frame captured in the front and side images based in part on at least one of (1) a front difference image produced by subtracting the front image of the subject without the spectacle frame from the front image of the subject wearing the spectacle frame and (2) a side difference image produced by subtracting the side image of the subject without the spectacle frame from the side image of the subject wearing the spectacle frame;
a positioner configured to locate a position of a subject wearing the spectacle frame within the subject field; and
a beam splitter positioned in an axis of the front image and configured to reflect the front image to the imager positioned off of the axis of the front image.
2. The system of claim 1 , wherein the beam splitter is positioned substantially at a 45 degree angle relative to the axis of the front image and configured to reflect the front image to the imager having an imaging axis approximately 90 degrees from the axis of the front image.
3. The system of claim 1 , wherein the imager comprises a first camera configured to capture the front image and a second camera configured to capture the side image.
4. The system of claim 3 , wherein the first camera and second camera have substantially parallel imaging axis, and wherein the beam splitter is configured to reflect the front image to the imaging axis of the first camera.
5. The system of claim 1 , further comprising an illuminator configured to illuminate the subject when the imager captures the front image and the side image.
6. The system of claim 5 , wherein the illuminator comprises at least one light source that is selectively controlled on or off.
7. The system of claim 1 , wherein the image processor is configured to determine a spatial distance in the front image.
8. The system of claim 1 , wherein the image processor is configured to determine a spatial distance in the side image.
9. The system of claim 1 , wherein the image processor determines the pupil position using image thresholding and connectivity analysis.
10. The system of claim 1 , wherein the image processor determines a lens frame within the spectacle frame using edge analysis of the front image.
11. The system of claim 1 , wherein the image processor determines a pantoscopic tilt based on edge analysis of the side view.
12. A method of fitting a corrective lens to a spectacle frame, the method comprising:
capturing a front image of a subject wearing the spectacle frame;
capturing a side image of the subject wearing the spectacle frame;
capturing a front image of the subject without the spectacle frame;
capturing a side image of the subject without the spectacle frame;
subtracting the front image of the subject without the spectacle frame from the front image of the subject wearing the spectacle frame to produce a front difference image;
subtracting the side image of the subject without the spectacle frame from the side image of the subject wearing the spectacle frame to produce a side difference image;
determining a position of the corrective lens frame from at least one of (1) the captured front images and the front difference image and (2) the captured side images and the side difference images;
determining the position of at least one pupil of the subject from at least one of the captured and difference images; and
determining a pupilary center of the corrective lens based in part on the position of the corrective lens frame and the position of the pupil.
13. The method of claim 12 , wherein determining the position of the corrective lens frame comprises determining, using edge detection, the corrective lens frame in the captured front image.
14. The method of claim 12 , wherein determining the position of the corrective lens frame comprises receiving information defining a box having at least one side tangential to an edge of the corrective lens frame.
15. The system of claim 1 , wherein the imager comprises a first camera configured to capture the front image and the side image, and wherein the beam splitter is configured to reflect the front image to the imaging axis of the first camera.
16. A method of fitting a corrective lens to a spectacle frame, the method comprising:
capturing a front image of a subject wearing the spectacle frame;
capturing a side image of the subject wearing the spectacle frame;
capturing a front image of the subject without the spectacle frame;
capturing a side image of the subject without the spectacle frame;
subtracting the front image of the subject without the spectacle frame from the front image of the subject wearing the spectacle frame to produce a front difference image;
subtracting the side image of the subject without the spectacle frame from the side image of the subject wearing the spectacle frame to produce a side difference image;
determining the position of at least one pupil of the subject from at least one of the captured and difference images; and
determining a position of the pupilary center of the corrective lens from the position of the pupil and at least one of (1) the captured front images and the front difference image and (2) the captured side images and the side difference image.
17. The method of claim 16 , wherein determining the position of the pupilary center of the corrective lens comprises determining, using edge detection, a corrective lens frame in the captured front image.
18. The method of claim 16 , wherein determining the position of the pupilary center of the corrective lens comprises receiving information defining a box having at least one side tangential to an edge of a corrective lens frame.