Soumyadip Rakshit

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This paper presents a novel iris coding method based on differences of discrete cosine transform (DCT) coefficients of overlapped angular patches from normalized iris images. The feature extraction capabilities of the DCT are optimized on the two largest publicly available iris image data sets, 2,156 images of 308 eyes from the CASIA database and 2,955(More)
The resilience of identity verification systems to subsampling and compression of human iris images is investigated for three high-performance iris-matching algorithms. For evaluation, 2156 images from 308 irises from the extended Chinese Academy of Sciences Institute of Automation database were mapped into a rectangular format with 512 pixels(More)
A novel eyelash removal method for preprocessing of human iris images in a human iris recognition system is presented. The method filters each occluded pixel along an axis perpendicular to the eyelash direction, and accepts the filtered value if it changes by more than a certain threshold. This allows partially occluded regions of the iris to be included in(More)
The resilience of identity verification systems to subsampling and compression of human iris images is investigated for three high performance iris matching algorithms. For evaluation, 2156 images from 308 eyes are mapped into a rectangular format with 512 pixels circumferentially and 80 radially. For identity verification, the 48 rows nearest the pupil(More)
A first investigation into the effects of cataract surgery and pupil dilation on iris recognition performance is presented. Images from 3 patients were acquired before cataract surgery and two weeks afterwards. Successful iris segmentation was achieved in all cases despite additional specular reflections in the pupil due to the artificial lens. No visible(More)
In this paper we propose a novel method of applying motion estimation techniques to human authentication by iris matching. By exploiting the inherent differences in vector fields generated by comparing same-class and different-class irises, good matching performance was obtained. The method was applied to 600 images of 150 eyes from the Bath database. The(More)
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