Guang Hua Zhang: Method of selecting the best enroll image for personal identification. Sensar, Buchanan Ingersoll P C, November 2, 1999: US05978494 (85 worldwide citation)

A method is described for selecting an enrollment image or standard from multiple close-up images of a subject such as a human eye. The selected image is the one image that best represents the appearance of that subject to an image processing system which identifies subjects by comparison of later t ...

Guang Hua Zhang, Marcos Salganicoff: Method of measuring the focus of close-up images of eyes. Sensar, Buchanan Ingersoll P C, September 14, 1999: US05953440 (83 worldwide citation)

In a method of determining whether an image of an eye is in focus a set of pixels is selected along a line passing through the pupil/iris boundary such that the set contains at least 5 iris portion pixels and at least 5 pupil portion pixels. Statistical values, preferably median values, are computed ...

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