A Novel Edge-Map Creation Approach for Highly Accurate Pupil Localization in Unconstrained Infrared Iris Images

Figure 2

The proposed edge-map creation technique for pupil localization: (a) an iris image from CITHV4; (b) smoothed iris image, on applying Gaussian filter with on (a); (c) binary image, after thresholding (b) with ; (d) cleaned binary image, obtained from (c) using hole filling and image opening for black objects; (e) edge-detected image, on applying Sobel edge detector without thinning on (d); (f) edge-detected image, on applying Sobel edge detector without thinning on (b); (g) edge-map, obtained by combining (e) and (f) using intersection operation; (h) pupil localized iris image obtained after applying CHT on (g).