Page 144 - Automated Fingerprint Identification Systems (AFIS)

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6.1.3.1 Livescan
Better imaging will become standard as agencies move to a 1,000 pixels per
inch (ppi) standard for all finger images and 500ppi for all palm images. This
additional clarity will be most welcomed by latent print examiners, because it
will provide more detail of the finger characteristics for comparison. This is
particularly important because inked and rolled cards are increasingly being
replaced by digital images captured on livescan machines. Although the initial
move from inked cards to 500ppi digital images on the early livescan machines
may have contributed to missed identifications if the booking officer was not
precise, better image capture can compensate for lack of skill of the person
doing the booking.
A “smart” livescan machine (see Fig. 6.2) is able to set an image quality Figure 6.2
threshold. Any image below the threshold would require that operator re-roll Desktop Livescan with
the subject or initiate an override to be able to accept and transmit the images. Camera