<div class="gmail_extra">Dear libfprint-devvers, <div class="gmail_quote"> For a forensics practical at our university, we want to obtain fingerprint images, so the students can simulate the process of feature-detection etc. on their own fingerprints. For this purpose, we've obtained two DigitalPersona U.are.U 4000 sensors. We tried to use these with fprint_demo, but though they are correctly(?) detected, actual fingerprint detection didn't work. symptoms: <ol><li>Start fprint_demo</li><li>console prints "** Message: now monitoring fd 10" Device is recognised: driver uru4000, imaging device, status: "Device ready for use" </li><li>After clicking "Enroll" for any finger, a pop-up window appears asking "scan your finger now", with a nice progress-bar.</li> <li>The scan-light on the reader comes on,</li><li>BUT touching my finger to the reader doesn't provoke any response. Touching for short or long periods of time doesn't change anything. </li><li>The Cancel and Quit buttons still respond normally (so main event-loop hasn't crashed, apparently)</li> <li>upon Cancel-ing, the scan-light goes off again.</li><li>upon Quit, console prints "** Message: no longer monitoring fd 10" </li></ol>(no console messages appear in-between) I also tried the sample programs from the DigitalPersona linux SDK, and these were able to collect and verify fingerprints from the same reader. However, the SDK-samples don't spit out the captured ((semi-)raw) image, which is what we want. Questions: 1) What can we do at our end to get the fprint-demo program to scan fingerprints from our reader? 2) How fares the "image capture" part of fprint_demo (and will it allow save-to-file?) 3) Is there any information I can send you to help you diagnose/fix this problem? (command outputs, traces, etc? when provided with instructions, I can run USB-sniffers and the like) Kind regards, Jules Kerssemakers Details: <ul><li>Reader: DigitalPersona "U.are.U 4000 sensor" (non-branded, with DigitalPersona logo on front) model# URU-4S-U1 Part# 50006-001 Rev. 101 USBID (lsusb): Bus 004 Device 005: ID 05ba:0007 DigitalPersona, Inc.</li><li>fprint obtained from ubuntu-fprint PPA: <a href="https://launchpad.net/%7Efingerprint/+archive/fprint" target="_blank">https://launchpad.net/~fingerprint/+archive/fprint</a> libfprint0, version "1:0.4.0+git20110418-0ppa1+debug1~lucid1" </li><li>OS used: Ubuntu 10.04 LTS Linux 2.6.32-40-generic #87-Ubuntu SMP Tue Mar 6 00:56:56 UTC 2012 x86_64 GNU/Linux </li></ul> </div> </div>