FPS Experiments
Underneath the enclosure, the scanner uses 8 blue LEDs and tiny camera to read a fingerprint. On the back, there is a processor that will try to read whatever is placed on top of the scanner's enclosure. Here is an image that shows the fingerprint scanner that was carefully opened:
I was interested in seeing if the fingerprint scanner was able to identify any other items placed on the fingerprint scanner. I tested using a few drawings on a sticky note:
I drew fiducials to align the fingerprint scanner's with the drawing in the image shown below. This ensured that the fingerprint was placed in the same position for each scan.
I first drew a pattern in test#1 and test#2 . Test#1 failed to enroll properly since it was not unique. Test#2 was successful in enrolling and identifying. I continued to test the drawing in test#1 to see when the scanner would accept the drawing. In test#3, I drew a bit more but the fingerprint scanner was unable to recognize the drawing. The drawing in test#4 was enough for the scanner to recognize by adding lines and scribbles similar to the unique patterns of a person's fingerprint. In test#5, I was interested in seeing if the scanner was able to recognize words as a fingerprint. While the fingerprint scanner was able to recognize that there was a "finger" pressed on the scanner, it failed to complete the enrollment process. The words probably did not create enough of a pattern for the scanner to accept.
I was also interested in how each of the images would look like when it was scanned. Luckily, the SDK_Demo.exe had a feature to get the image and save as a bitmap. The "Get Image" button requires the a valid fingerprint press before it begins scanning. The Get Raw Image immediately scans whatever is on the scanner even if it is not a valid fingerprint pattern. After clicking on the "Save Image To File", a 240x216 sized bitmap image was saved to my computer.
| Test#1 | Test#2 |
|---|---|
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| Solid Green | You won! |
| Test#1 | Test#2 | Test#3 | Test#4 | Test#4 | | | |
a SparkFun board, and the palm of my hand.
palm... lower probability recognize