Abstract: The invention relates to a method for automatically establishing parameters in order to centre and/or personalise corrective lenses for spectacles, comprising the following steps: —taking images of the frame from different viewing angles, —defining an initial model of the frame in a reference system based on a set of predefined initial parameters, projecting a region of interests in the images, —comparing the projections and evaluating a similarity between said projections, —modifying at least one of the parameters of the model and reiterating the steps until a maximum level of similarity between the projections is obtained, —deducing the at least one of the parameters from the model associated with the projections which have the maximum level of similarity.

Abstract: The invention relates to a method for automatically establishing parameters in order to centre and/or personalise corrective lenses for spectacles, comprising the following steps: —taking images of the frame from different viewing angles, —defining an initial model of the frame in a reference system based on a set of predefined initial parameters, projecting a region of interests in the images, —comparing the projections and evaluating a similarity between said projections, —modifying at least one of the parameters of the model and reiterating the steps until a maximum level of similarity between the projections is obtained, —deducing the at least one of the parameters from the model associated with the projections which have the maximum level of similarity.

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: The invention relates to a system that is used to aid in determining vision correction. The inventive system is characterised in that it combines: a camera which can take animated images of the subject's face along a determined visual axis; a display device which represents the images taken by the camera; an accessory which can be worn by the subject in a fixed manner on the head and which bears a plurality of visual reference marks; means which form the visual reference mark(s) and which can cover at least two determined regions in relation to the camera; and image-analysis means which can analyze the position of the visual reference marks in the images taken by the camera and deduce therefrom the position and spatial orientation of the accessory and, consequently, the subject's head when the subject is looking at a visual target, in order to ascertain information relating to the visual behaviour of the subject when the subject moves the direction in which he/she is looking.

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 system that is used to aid in determining vision correction. The inventive system is characterised in that it combines: a camera which can take animated images of the subject's face along a determined visual axis; a display device which represents the images taken by the camera; an accessory which can be worn by the subject in a fixed manner on the head and which bears a plurality of visual reference marks; means which form the visual reference mark(s) and which can cover at least two determined regions in relation to the camera; and image-analysis means which can analyze the position of the visual reference marks in the images taken by the camera and deduce therefrom the position and spatial orientation of the accessory and, consequently, the subject's head when the subject is looking at a visual target, in order to ascertain information relating to the visual behaviour of the subject when the subject moves the direction in which he/she is looking.