GVF Snakes (gradient vector flow snakes) model based iris location algorithm

An iris positioning and iris technology, which is applied in computing, computer parts, character and pattern recognition, etc., can solve the problems of relatively high iris image quality requirements and large deviations, and achieve uniform distribution, strong self-adaptability, and simple implementation Effect
CN103971089AInactive Publication Date: 2014-08-06RES INST OF SUN YAT SEN UNIV & SHENZHEN
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
RES INST OF SUN YAT SEN UNIV & SHENZHEN
Publication Date
2014-08-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a GVF Snakes (gradient vector flow snakes) model based iris location algorithm. The GVF Snakes model based iris location algorithm includes 1), subjecting an original iris image to coarse positioning and looking for a pseudo circle of a pupil; 2), calculating the GVF value of the image and subjecting the inner edge of an iris to coarse positioning by the aid of a GVF Snakes module; 3), subjecting the inner edge of the iris to accurate positioning by the aid of the step 2) to determine the geometrical parameter of the inner edge; 4), detecting the outer edge of the iris by the aid of the GVF Snakes module, processing the outer edge of the iris as a circle and positioning the outer edge of the iris; 5), determining the geometrical parameter of the outer edge of the iris by the aid of the outer edge of the iris positioned in the step 4); 6), drawing a circle by the aid of the center and the radius of the outer edge, wherein the circumference is an accurately positioned image of the outer edge of the iris, and the iris can be accurately positioned by combining the center and the radius of the inner edge. The GVF Snakes model based iris location algorithm is a new method in positioning of the iris and has the advantages of high adaptive capability and accurate algorithm, the GVF Snakes model is easy to implement with new constraints easily added and the like.
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Description

technical field

[0001] The invention relates to the technical field of biological feature identification, in particular to an iris positioning algorithm based on a GVF Snakes model. Background technique

[0002] In recent years, various biometric-based identification technologies have been developed rapidly. Iris recognition has the characteristics of accuracy, non-contact, uniqueness, life-long invariance and portability, and is one of the most ideal identification technologies. Iris localization is one of the key steps in iris recognition, and it is the primary research problem of iris recognition. The existing foreign algorithms include Daugman's circle detection algorithm, which uses an effective calculus operator Perform iris positioning; the iris positioning algorithm in the Wildes system uses a voting mechanism. The disadvantage of the Daugman and Wildes iris location algorithms is that they have high requirements on the iris image. The domestic iris positioning a...

Claims

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