Method for determining measurement parameters for a spectacle wearer
First Claim
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1. A method for determining measurement parameters for a spectacle wearer comprising the steps of:
- generating an image of a spectacle wearer provided with a spectacle frame;
determining automatically, on said image, by luminance gradient analysis, where a plurality of horizontal and vertical straight lines tangential to said frame would be positioned;
determining automatically, on said image, by luminance gradient analysis, where the center of each pupil of the eyes of said wearer would be positioned; and
calculating the values of said measurement parameters from said positions.
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Abstract
A method for determining measurement parameters from the image of a spectacle wearer wearing a spectacle frame is disclosed in which the position of the center of the pupil of each eye is obtained automatically by analyzing the luminance gradient in the region of the pupils and the positions of the horizontal and vertical straight lines tangential to the frame are also obtained automatically by luminance gradient analysis and extraction of the contours of the frame, enabling said parameters to be calculated accurately.
48 Citations
20 Claims
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1. A method for determining measurement parameters for a spectacle wearer comprising the steps of:
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generating an image of a spectacle wearer provided with a spectacle frame; determining automatically, on said image, by luminance gradient analysis, where a plurality of horizontal and vertical straight lines tangential to said frame would be positioned; determining automatically, on said image, by luminance gradient analysis, where the center of each pupil of the eyes of said wearer would be positioned; and calculating the values of said measurement parameters from said positions. - View Dependent Claims (2, 3, 4, 5)
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6. A method for determining measurement parameters for a spectacle wearer comprising the steps of:
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generating an image of a spectacle wearer provided with a spectacle frame; determining automatically, on said image, by luminance gradient analysis, where a plurality of horizontal and vertical straight lines tangential to said frame would be positioned; determining automatically, on said image, by luminance gradient analysis, where the center of each pupil of the eyes of said wearer would be positioned; defining four windows of predetermined size around the center of each pupil, each window containing one straight line tangential to an inside contour of each half-frame; and calculating the values of said measurement parameters from said positions. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method for determining measurement parameters for a spectacle wearer comprising the steps of:
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generating an image of a spectacle wearer provided with a spectacle frame; determining automatically, on said image, by luminance gradient analysis, where a plurality of horizontal and vertical straight lines tangential to said frame would be positioned; determining automatically, on said image, by luminance gradient analysis, where the center of each pupil of the eyes of said wearer would be positioned by; determining a window covering the region of the pupil; determining, within said window, those points on the image having a luminance that is higher than a threshold value; and calculating the position of the centroid of said points; and calculating the values of said measurement parameters from said positions. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification