We consider the problem of generating a biometric image from two different traits. Specifically, we focus on
generating an IrisPrint that inherits its structure from a fingerprint image and an iris image. To facilitate this,
the continuous phase of the fingerprint image, characterizing its ridge flow, is first extracted. Next, a scheme is
developed to extract “minutiae” from an iris image. Finally, an IrisPrint, that resembles a fingerprint, is created
by mixing the ridge flow of the fingerprint with the iris minutiae. Preliminary experiments suggest that the new
biometric image (i.e., IrisPrint) (a) can potentially be used for authentication by an existing fingerprint matcher,
and (b) can potentially conceal and preserve the privacy of the original fingerprint and iris images.
We discuss the problem of preserving the privacy of a digital face image stored in a central database. In the
proposed scheme, a private face image is dithered into two host face images such that it can be revealed only
when both host images are simultaneously available; at the same time, the individual host images do not reveal
the identity of the original image. In order to accomplish this, we appeal to the field of Visual Cryptography.
Experimental results confirm the following: (a) the possibility of hiding a private face image in two unrelated
host face images; (b) the successful matching of face images that are reconstructed by superimposing the host
images; and (c) the inability of the host images, known as sheets, to reveal the identity of the secret face image.
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