Mike French

[Mike French]

@bredemarket you must have your user name also set to your display name, while my display name is not my user name. That has to be why @MikeFrech didn’t create a link. Should be @afsadmin.

Regarding your previous post… Scott was the one who requested I visit the NIST image group in Gaithersburg. I’m glad I did because I learned a great deal. For example we know from basic psychology how our brains interpret shadows and reflections, and we can play tricks on our perceptions with special images because of how are brains are wired to see lights and shadows. The same issue exists with contactless fingerprints, because examiners learn to interpret ridge structure from contact prints (from ink) or contact imprints (from livescan), yet if we don’t know we are seeing a contactless print, light reflecting off a ridge (or a ridge casting a shadow) at an unusual angle can and will play tricks on the brain. This doesn’t affect biometric systems in the same way it affects humans. I discovered first hand how difficult these images are to compare, because I did do some comparisons, and it messed with my mind. Needless to say, it was a fascinating trip. I even got to pick up an apple off the ground from a clone of Sir Isaac Newtion’s apple trees, they have those trees on campus. I kept it in my freezer until I moved last year 🙂

• This reply was modified 2 years, 2 months ago by Mike French.
• This reply was modified 2 years, 2 months ago by Mike French.

[Mike French]

@bredemarket just testing to see how I tag other users in these posts…

[Mike French]

Thanks for the post John! I’m skeptical of the benefits of an anti-microbial coated platen vs. wiping the platen with alcohol after each use. My task going forward will be to attract users to this site that have first hand experience ;-). As for contactless capture in general, having had the opportunity to work with the NIST image group in the certification process, I understand why these devices are not certified as enrollment devices for NGI. It’s because these images pose real challenge to fingerprint examiners, as reflected light off the friction skin behaves differently then imprinted contact images on the platen.

• This reply was modified 2 years, 2 months ago by Mike French.

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