1. A method of capturing an image of an iris, said method comprising the steps of: using a camera lens with a focus position to produce an image of a living being's eye; sensing an actual position of the living being's eye at a point in time at which the camera lens produced the image of the living being's eye; and determining a Gaussian blur kernel distribution based upon: the focus position of the camera lens; and the actual position of the living being's eye at the point in time; and using the blur kernel distribution to digitally unblur the produced image.