Yes, Paul, it's my pleasure to do so, and thank you for testing and evaluating it. You're right it's a little too small for a press-typed sensor, which could capture only a sub-area of fingerprint, yet the device works pretty good on Windows. So I'm inclined to think there could have rooms for improvements. And, I was not aware of the 90 degree rotation, I think I must have missed some params to tweak. Maybe we could later work it out al-together. I will clean the code a bit against current HEAD of libfprint before I submit the patch, and will share the docs and toolkits I had used along the way. Will let you know then! <div class="gmail_quot<blockquote class=" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello, I've tested Juvenn's patch as linked in recent message thread on the mailing list: <a href="https://gist.github.com/juvenn/939298" target="_blank">https://gist.github.com/juvenn/939298</a> . It bitrotted a bit wrt to current HEAD, but was trivial to fix. I should say that I didn't have much first-hand experience with fingerprint scanning devices. Except for random cases which almost everyone experienced, like you go to some office, where they have safe with fingerprint lock, which they can't open for half an hour and then call a technician with a hammer to work around the technology. Neither I tried to look up that NIST "NBIS" thingy. But when I was a young student I registered for access to a handwriting recognition system from them, which arrived in snail mail on a CD with a nice printed manual which said that the system achieves recognition rate of 36.578% and its sole purpose is to serve as a baseline for evaluating other handwriting recognition systems. So, my wild guess is that NBIS is just the same. So, I'm not at all surprised with the initial results I got, which match those posted by another subscriber: I had troubles enrolling a finger, and then recognizing, while fingerprint images shown by fprint_demo were pretty legible. Some thinking helped though. First of all, AES3500 cannot capture a *fingerprint*, it just physically too small for that. It can capture only small sub-area of it, then depending on how exactly you put your finger on it, areas will be rather different, likely straining NBIS. As a fingerprinting layman, I also put my index finger's tip on the sensor, and the tip contains almost parallel lines, and probably lacks enough features to recognize. Shape of my APC Biopod kinda suggests that they aim for thumb's fingerpad instead, which has curves and stuff. All in all, the best results I expectedly had with small finger - the sensor can capture pretty large part of it. Except that NBIS couldn't tell the difference between my left and right little fingers. All in all, specifically AES3500 image capture driver works pretty well - fingerprint lines are black, spaces between them are white, grayscale shades are there. The only thing I noticed is that scanned image is apparently rotated 90 degrees (i.e. mostly horizontal fingerprint lines are shown vertically), not sure if that presents additional puzzle for NBIS. So, +1 for merging the patch, Juvenn, would you submit it via fprint bugtracker, as was suggested by Vasily? Thanks, Paul mailto:<a href="mailto:pmiscml@gmail.com">pmiscml@gmail.com</a> </div>