APPARATUS AND METHOD FOR POSITIONING AN IRIS FOR IRIS IMAGE CAPTURE

摘要

The invention provides an apparatus and method for positioning an iris for iris image capture. An iris image sensor is configured to have an image capture region defining an intended position of the subject's iris for image capture. A feedback object and an optical system are provided. In one aspect, the optical system may comprise a lens element disposed such that, responsive to positioning of the subject's iris within the image capture region, the optical system forms a subject viewable in-focus upright image of the feedback object. In another aspect, the optical system may comprise an occluder, configured such that responsive to positioning of the subject's iris partially or wholly outside the image capture region, the optical system occludes at least a portion of the feedback object from the subject's view.

主权项

1. An iris imaging apparatus for acquiring an image of a subject's iris, comprising:
an iris camera comprising an image sensor, and configured to have an image capture region defining an intended position of the subject's iris for image capture; a feedback object; and an optical system comprising a lens element disposed such that, responsive to positioning of the subject's iris within the image capture region, the optical system forms a subject viewable in-focus upright image of the feedback object; wherein a distance between the intended position of the subject's iris during image capture and the feedback object is less than a near point distance, the near point distance defining a shortest distance from an eye at which an object is capable of in-focus viewing by the eye, and wherein a distance between the intended position of the subject's iris during image capture and the in-focus upright image formed by the optical system is greater than or equal to the near point distance.