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add image for finger minutiae

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@ -22,6 +22,11 @@ One of the most recognizable types of biometric authentication has to be the fin
1. :material-fingerprint: It's theorized that the reason humans have fingerprints in the first place is to [enhance our sense of touch](https://www.science.org/doi/10.1126/science.1166467).
<figure markdown>
![Example of finger minutiae including forks, ends, islands, and inclosures](../assets/images/biometrics-explained/finger_minutiae.jpeg)
<figcaption>source: <a href="https://sites.rutgers.edu/fingerprinting/no-two-finger-prints-are-alike/"></a>rutgers.edu</figcaption>
</figure>
There are [three](https://www.androidauthority.com/how-fingerprint-scanners-work-670934/) main ways we accomplish this in consumer devices: optical sensors, capacitive sensors, and ultrasonic sensors.
### :material-camera: Optical Fingerprint Sensors