Method for localizing irises in images using gradients and textures
AssigneeMitsubishi Electric Research Laboratories, Inc.
InventorsMichael J. Jones, Guodong Guo
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Abstract
A method for extracting an iris from an image is presented. Edges of an iris are detected in an image. Texture from the image is acquired. The edges and texture are combined to generate an inner boundary and an outer boundary of the iris. Also, to improve the accuracy of the iris boundary detection, a method to select between ellipse and circle models is provided. Finally, a dome model is used to determine mask images and remove eyelid occlusions in unwrapped images.
Claims16
A method for localizing pixels representing an iris in an image acquired of an eye, comprising a computer system for performing steps of the method, comprising the steps of:
- determining gradient information from an image acquired of an eye;
- determining texture information from the image;
- and
- combining the gradient information and the texture information to generate boundaries of an iris image including pixels representing an iris in the image of the eye.
A method for localizing pixels representing an iris in an image acquired of an eye, comprising a computer system for performing steps of the method, comprising the steps of:
- measuring a gradient magnitude of pixel intensities in an image of an eye;
- determining a texture difference in the image;
- combining the gradient magnitude and the texture difference;
- defining boundaries of an iris image, including pixels representing an iris in the image, according to the combination of the gradient and the texture difference.
Dependencies are inferred from the claim text.