Method for determining at least one geometric/physiognomic parameter associated with the mounting of an ophthalmic lens in a spectacle frame worn by a user
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United States of America Patent
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Aug 25, 2015
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app pub date -
Dec 30, 2011
filing date -
Feb 21, 2011
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Abstract
Method includes: (a) placing on a user's head an accessory including at least one brightness calibration element having at least two contrasted zones; (b) capturing an image of the user's head with the accessory thereon with a device; (c) determining the position of the image of the brightness calibration element of the accessory on the captured image; (d) determining a measured value of the brightness of one part of the image of the brightness calibration element or of the image located close to the brightness calibration element; (e) modifying a parameter for adjusting the optical image-acquisition conditions of the device as a function of the measured value to improve the contrast of the image of contrasted zones of the calibration element; (f) capturing another image with the modified parameter for adjusting the optical acquisition conditions; and (g) determining the required geometric/physiognomic mounting parameter on the basis of the other image.
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