Abstract: A calibration method for determining angles between an image acquisition module reference frame and an accelerometer reference frame of a portable electronic device, comprising receiving a set of images of a known pattern from the image acquisition module from different positions, the known pattern being in the same spatial position when acquired, and each image being associated with a gravity data corresponding to the measurement of the gravity by the accelerometer expressed in the accelerometer reference frame, determining the angles between the image acquisition module reference frame and the known pattern reference frame based on the received pictures of the set of pictures, determining the angles between the image acquisition module reference frame and the accelerometer reference frame based on the determined angles between the image acquisition module reference frame and the known pattern reference frame and assuming the gravity measured by the accelerometer is the same for each image.

Abstract: A calibration method for determining angles between an image acquisition module reference frame and an accelerometer reference frame of a portable electronic device.

Abstract: A calibration method for determining parameters of a portable electronic device which includes an image acquisition module to be used to determine parameters of a user and a display, where the method includes providing a known pattern, using an image of the known pattern from the image acquisition module of the portable electronic device from a first position, providing at least one indication to the user to move the portable electronic device relative to the known pattern to at least a second position different from the first position, taking an image of the known pattern in the second position using the image acquisition module, and processing the image of the known pattern taken from the second position to determine at least the parameters of the portable electronic device comprising the image acquisition module used to take the image.

Abstract: A calculation module for determining a probability model of a parameter of a first reference posture of a subject, the probability model being intended to determine at least a production parameter of an optical element suitable for the subject, the calculation module being configured: to determine at least one value of a parameter of a second reference posture, during an occurrence of the second reference posture, and to determine the probability model of a parameter of a first reference posture based on the at least one value of the parameter of the second reference posture.

Abstract: A calibration method for determining angles between an image acquisition module reference frame and an accelerometer reference frame of a portable electronic device.

Abstract: A calibration method for determining parameters of a portable electronic device which includes an image acquisition module to be used to determine parameters of a user and a display, where the method includes providing a known pattern, using an image of the known pattern from the image acquisition module of the portable electronic device from a first position, providing at least one indication to the user to move the portable electronic device relative to the known pattern to at least a second position different from the first position, taking an image of the known pattern in the second position using the image acquisition module, and processing the image of the known pattern taken from the second position to determine at least the parameters of the portable electronic device comprising the image acquisition module used to take the image.

Abstract: A calibration method for determining angles between an image acquisition module reference frame and an accelerometer reference frame of a portable electronic device.

Abstract: The invention concerns a method for measuring parameters necessary for producing corrective spectacles using an instrument (1) comprising the following steps: S1: positioning the wearer at a predefined distance from the frame (2) of the instrument (1), S2: placing a screen (5) of the instrument (1) opposite the wearer and displaying at least one image, S3: placing the frame of the corrective spectacles on the face of the wearer, S4: substituting the screen (5) with a one-way mirror (4) of the instrument, S5: taking the measurements.

Abstract: The invention concerns a method for measuring parameters necessary for producing corrective spectacles using an instrument (1) comprising the following steps: S1: positioning the wearer at a predefined distance from the frame (2) of the instrument (1), S2: placing a screen (5) of the instrument (1) opposite the wearer and displaying at least one image, S3: placing the frame of the corrective spectacles on the face of the wearer, S4: substituting the screen (5) with a one-way mirror (4) of the instrument, S5: taking the measurements.

Abstract: The invention concerns a method for helping determine the vision parameters of a subject (100), comprising the following steps: —taking (120) two images (11, 12) from two different angles of the face of the subject by means of a camera (10), the subject (S) being in a natural distant vision position, —determining (130) the inclination of the camera (10) relative to the ground at the time when the images are taken, —deducing therefrom (140) the inclination and the direction of the face of the subject (S), characterized in that the camera is arranged outside a foveal area of the subject when the images (11, 12) are taken (120).

Abstract: The invention relates to a method for estimating a reference posture of a subject with a view to taking measurements in order to determine the parameters for manufacturing a vision correction device, including, for a plurality of instances in which the head reaches a target reference posture from at least one deviated posture, the steps of: measuring the actual reference posture to thus obtain a plurality of sets of actual reference posture data, and storing said sets of data in a memory; and processing said sets of actual reference posture data using a digital processing unit in order to obtain an optimal reference posture.

Abstract: The invention concerns a method for helping determine the vision parameters of a subject (100), comprising the following steps: —taking (120) two images (11, 12) from two different angles of the face of the subject by means of a camera (10), the subject (S) being in a natural distant vision position, —determining (130) the inclination of the camera (10) relative to the ground at the time when the images are taken, —deducing therefrom (140) the inclination and the direction of the face of the subject (S), characterised in that the camera is arranged outside a foveal area of the subject when the images (11, 12) are taken (120).

Abstract: A method for measuring the position of a virtual characteristic point (PRV) associated with the face of a person wearing corrective lenses, said method comprising: acquiring at least two images of the wearer's face using an image acquisition means; estimating the position of the face in relation to the image acquisition means; and determining, on the images, the co-ordinates (Xpref, Ypref) of reference points associated with the face. Given that the virtual characteristic point is visible on at most one image and that the position of the virtual characteristic point is connected to the co-ordinates of the reference point(s) by a predetermined geometric relationship, the measurement method also comprises calculating at least one of the co-ordinates (XPRV, YPRV, ZPRV) of the virtual characteristic point (PRV) on the basis of the reference point(s), using the geometric relationship.

Abstract: The invention relates to a method for estimating a reference posture of a subject with a view to taking measurements in order to determine the parameters for manufacturing a vision correction device, including, for a plurality of instances in which the head reaches a target reference posture from at least one deviated posture, the steps of: measuring the actual reference posture to thus obtain a plurality of sets of actual reference posture data, and storing said sets of data in a memory; and processing said sets of actual reference posture data using a digital processing unit in order to obtain an optimal reference posture.

Abstract: A method for measuring the position of a virtual characteristic point (PRV) associated with the face of a person wearing corrective lenses, said method comprising: acquiring at least two images of the wearer's face using an image acquisition means; estimating the position of the face in relation to the image acquisition means; and determining, on the images, the co-ordinates (Xpref, Ypref) of reference points associated with the face. Given that the virtual characteristic point is visible on at most one image and that the position of the virtual characteristic point is connected to the co-ordinates of the reference point(s) by a predetermined geometric relationship, the measurement method also comprises calculating at least one of the co-ordinates (XPRV, YPRV, ZPRV) of the virtual characteristic point (PRV) on the basis of the reference point(s), using the geometric relationship.