Method for determining measurement parameters for a spectacle we

Details Method for determining measurement parameters for a spectacle we Method for determining measurement parameters for a spectacle we

1995-04-27

1997-04-01

Dang, Hung X.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

For interpupillary distance measuring or lens positioning

351200, A61B 310, A61B 300

Patent

active

056171552

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.

REFERENCES:
patent: 4591246 (1986-05-01), Cousyn
patent: 4762407 (1988-08-01), Anger et al.
patent: 5450335 (1995-09-01), Kikuchi

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