Ambient light rejection filter

Details Ambient light rejection filter Ambient light rejection filter

2007-02-21

2011-12-13

Ahmed, Samir (Department: 2624)

Image analysis

Applications

Personnel identification

C356S071000

Reexamination Certificate

active

08077929

ABSTRACT:
A fingerprint reader is described. The fingerprint reader includes an illumination source that produces light and a camera. An optical window is also part of the reader. The window is positioned so that light from the illumination source passes through the optical window and then is reflected to the camera for imaging a person's fingerprint. A filter may be positioned on or proximate to the optical window. The filter prevents ambient light from reaching the camera. In some situations, the filter will be a dielectric mirror, a dielectric filter, a holographic mirror, a holographic filter, a dichroic mirror or a dichroic filter.

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