Two New Methods for Locating Outer Edge of Iris - Advances in Image and Graphics Technologies - page 347

Fig. 1. Input image Fig. 2. Gray histogram of the image

Fig. 3. Edge image Fig. 4. Inner edge of iris image

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Image Segmentation

Iris is a small part of the whole eye image, and the redundant part greatly increases
the workload of the computer and the time of locating iris. Furthermore, a series of
factors (i.e., eyebrows, eyelids) may affect the location of outer edge of iris. So we
intercept a sub-image from input image (the size of which size 240*220).

Fig. 5. Sub-image