Comment 64 for bug 1641290

@Pauline Essentially, you need to produce a scan that's similar to one of the enrolled scans. In my experience, one of the best things you can do to improve recognition is to move your finger in a straight line. Don't bend your finger until the last moment when you need to scan the finger tip. Try pulling it along the sensor moving the entire palm of your hand. If you observe the images, the ones that are the least curved are the best.

BTW another person found a bug in stitching code a few days ago. When it's fixed, the recognition rate should improve somewhat.