I've got an x61 tablet pc with fingerprint reader, and I want a way to see the image(?) scanned when I swipe my finger. Obviously I can use it for login - I don't really care about that, it's easier for me to type my password. I just want to be able to see the fingerprint it gets.
The X61 series uses a UPEK Touchstrip fingerprint reader that, when using Linux drivers, does hardware image processing and then returns a status to the computer. Due to this design there is no way for you to access the scanned image.
With that said, there is evidence that with proprietary Windows drivers the device operates in a different mode that is capable of returning a scanned image, but it doesn't looks like there's been any development done in this area.