Essilor International (compagnie Generale D'optique)

Essilor International

Jean Delzers

Ahmed Haddadi

A method for determining at least one behavioral, postural or geometric-morphological characteristic of a person wearing spectacles, the method includes the steps of: a) illuminating the wearer's head using an infrared light source (), b) acquiring an image of the wearer's head using an infrared image sensor (); c) in the image, locating reflections from the infrared light surface, reflected by the two lenses of the spectacles; and d) using a computation unit () to deduce the required characteristic as a function of the positions of the reflections in the image.

Method for determining a behavioural, postural or geometric-morphological characteristic of a person wearing spectacles

A method for estimating an eye/spectacles distance (VG) includes the steps of:

Method for estimating a distance separating a pair of glasses and an eye of the wearer of the pair of glasses

A method for determining at least one characteristic relating to the posture of the head () of a person () wearing spectacles () including a frame () and two lenses (G,D), using a determining device including an image sensor, at least one light source and a computation unit, the method includes steps of: a) acquiring an image () of at least part of the wearer's head, in which the spectacles are illuminated by the light source; b) in the image, locating reflections (D,G,D,G) from the light source, reflected by the two lenses of the spectacles; and c) deducing the wearer's head posture characteristic in relation to the image sensor, as a function of the position of the reflections in the image.

Method for determining at least one head posture characteristic of a person wearing spectacles

A method for determining reading distance for an individual made to observe a reading zone includes positioning the individual in front of an apparatus to learn their reading distance. The individual reads of a zone that is placed on a portable tablet and equipped with at least one location marker. At least one image is acquired allowing at least one facial reference point of the individual and each marker of the reading tablet. The images is processed taking into account the position of the facial reference point of the individual and the position of the at least one marker of the tablet and the indicating of the reading distance is conveyed.

Method for determining reading distance

Method for determining, in a natural posture, at least one geometric/physiognomic parameter associated with the mounting of an ophthalmic lens in a spectacle frame intended to be worn by a wearer. The method includes: (a) capturing at least one substantially frontal image of the wearer's head; (b) determining a measured value of an angle of inclination during the capturing step, which depends on the inclination of the wearer's head about a main axis perpendicular to a sagittal plane of the wearer's head; (c) determining a reference value of the angle of inclination corresponding to a natural posture of the wearer's head; and (d) determining the required geometric/physiognomic parameter on the basis of the substantially frontal image captured and as a function of the difference between the measured value of the angle of inclination determined in step (b) and the reference value of the angle of inclination determined in step (c).

Method for determining, in a natural posture, at least one geometric/physiognomic parameter associated with the mounting of an ophthalmic lens in a spectacle frame

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.

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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Charenton-le-Pont, France

Jean Delzers