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A hybrid method for accurate iris segmentation on at-a-distance visible-wavelength images

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Academic year: 2020

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Figure

Fig. 1 Block diagram of the proposed method
Fig. 4d). Next, the area, centroid position and eccentricityof the resulting blobs are analysed to distinguish reflec-tions from anything else
Fig. 4 Specular reflections removal. Iris boundary mask applied to the eye sub-image (a), Gaussian filtering (b), Gaussian difference (c), specularreflections thresholding (d), blobs corresponding to specular reflections (e) and eye after specular reflections removal (f)
Fig. 5 Precise iris segmentation. Cropped greyscale eye image without specular reflections (a), residue of the close-hole operator(b), Otsu’sthresholding and binarisation after smoothing process and convex hull (c)
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