Touchless-to-touch fingerprint systems compatibility method
Touchless multiview fingerprinting technology has been proposed as an alternative to overcome intrinsic problems of traditional touchbased systems. However, if one wants to benefit from the advantages presented by touchless scanners, the captured images must be processed in order to become compatible to touchbased systems. This paper proposes a two-step solution to the touchless-to-touch compatibility problem. First, it reproduces the texture of touchbased acquisition; and second, it performs a geometric transformation in order to approximate the nail-to-nail touchbased enrollment process. Two experiments were proposed, one to evaluate the quality of the processed images, another one to estimate the EER (equal error rate) for a set of 200 fingerprints (100 fingers, 2 images per finger). Results show that 90% of the images presented good, very good or excellent scores according to NFIQ. In addition, the observed EER was approximately 4%, demonstrating the viability of the proposed method.