Fig. 7
Some more results of extracted iris from the UBIRIS images [24]. a Original image; b Converted gray scale; c upper edge of the eye with gray thresh level of 0.9; d equivalent binary form of the detected upper eyelid; e data points of the upper eyelid; f-g upper eyelid as a result of employing parabolic function (2nd degree polynomial); h result of Daugman’s Integro-Differential operator iris detection; i-n results eyelids detection with our optimized Daugman’s algorithm; and o final results of segmented iris occluded by upper and lower eyelids