Hi Areseniy, It is wonderful, that you ve succeeded to write a driver for VFS5011. I have one in my Vostro 3750, and can't use it with my Debian/Linux OS :-(. Are the sources of your driver available for testing? -- Regards, Wojtek <div class="gmail_quote">2012/12/22 Arseniy Lartsev <<a href="mailto:arseniy@chalmers.se" target="_blank">arseniy@chalmers.se</a>> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Hi, I've made a driver for 138a:0011 Validity Sensors, Inc. VFS5011 Fingerprint Reader which I have in my Dell Vostro 3350 laptop. It's now at a stage of "kind of working", there are still a few defects left and I'm planning to publish it as soon as I fix those. Right now I'm trying to assess the driver's quality. So I've repeatedly scanned 3 different fingers, 100 times each and calculated libfprint's comparison score (as returned by fpi_img_compare_print_data) for all pairs of images. To cut the long story short, for one of the fingers 17% of comparison scores between different images of this finger were below 25, 8% below 20, 3% below 15 and 0.6% below 10. For images of different fingers, 2% scores were ≥10 and 0.07% ≥15 (the highest was 18, 1 out of 12000). Do you think it's good enough? Or should I try to improve imaging quality? For example, if one enrolls the same finger 4 times (this is what windows software on my laptop does, btw) then the chance of false negative would be 0.17⁴ = 0.08%, and the chance of false positive, as estimated from exponential fit to the histogram, would be about 1 in 200000. Does it make sense? Here are histograms of comparison scores for images of the same finger: Finger 1 <a href="http://mc2-k082.mc2.chalmers.se/fprint/rindex1_cmp.png" target="_blank">http://mc2-k082.mc2.chalmers.se/fprint/rindex1_cmp.png</a> Finger 2 <a href="http://mc2-k082.mc2.chalmers.se/fprint/rindex2_cmp.png" target="_blank">http://mc2-k082.mc2.chalmers.se/fprint/rindex2_cmp.png</a> Finger 3 <a href="http://mc2-k082.mc2.chalmers.se/fprint/rmiddle_cmp.png" target="_blank">http://mc2-k082.mc2.chalmers.se/fprint/rmiddle_cmp.png</a> And here's for images of different fingers: <a href="http://mc2-k082.mc2.chalmers.se/fprint/rindex2_rmiddle_cmp.png" target="_blank">http://mc2-k082.mc2.chalmers.se/fprint/rindex2_rmiddle_cmp.png</a> Best regards, Arseniy _______________________________________________ fprint mailing list <a href="mailto:fprint@lists.freedesktop.org">fprint@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/fprint" target="_blank">http://lists.freedesktop.org/mailman/listinfo/fprint</a> </blockquote></div>