Video-Based Hyper-Focal Imaging Method for Iris Recognition in the Visible Spectrum [open pdf - 486KB]
"We design and implement a hyper-focal imaging system for acquiring iris images in the visible spectrum. The proposed system uses a DSLR Canon T2i camera and an Okii controller to capture videos of the ocular region at multiple focal lengths. The ensuing frames are fused in order to yield a single image with higher fidelity. Further, the proposed setup extends the imaging depth-of-field (DOF), thereby preempting the need for employing expensive cameras for increased DOF. Experiments convey the benefits of utilizing a hyper-focal system over a traditional fixed-focus system for performing iris recognition in the visible spectrum."
2013 IEEE. Posted here with permission. Documents are for personal use only and not for commercial profit.
Center for Homeland Defense and Security: http://www.hsaj.org/
Homeland Security Affairs, IEEE 2012 Conference on Technology for Homeland Security: Best Papers (November 2012)