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blog/posts/biometrics-explained.md
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@ -150,10 +150,9 @@ There are two approaches for extracting biometric data from video.
This approach attempts to model the human body in order to track the different parts of it. A well-known example of this approach is the Microsoft Kinect, which only consists of a fairly low-resolution camera. It simplifies the human body into a stick figure, which you can see in footage of the [Kinect](https://www.youtube.com/watch?v=33AsuE-WP64) in action. It then uses the distances and joint angles of the model for gait recognition.
<figure markdown>
![Diagram showing the kinect's model of the human body, a 2D skeleton made up of various parts](../assets/images/biometrics-explained/kinect-skeleton.jpeg)
<figcaption>source: <a href="https://www.researchgate.net/publication/334049964_Markerless_Human_Motion_Tracking_Using_Microsoft_Kinect_SDK_and_Inverse_Kinematics">Alireza Bilesan, Saeed Behzadipour, Teppei Tsujita, Shunsuke Komizunai, and Atsushi Konno</a></figcaption>
</figure>
![Diagram showing the kinect's model of the human body, a 2D skeleton made up of various parts](../assets/images/biometrics-explained/kinect-skeleton.jpeg)
<small aria-hidden="true">Image Credit: <a href="https://www.researchgate.net/publication/334049964_Markerless_Human_Motion_Tracking_Using_Microsoft_Kinect_SDK_and_Inverse_Kinematics">Alireza Bilesan, Saeed Behzadipour, Teppei Tsujita, Shunsuke Komizunai, and Atsushi Konno</a></small>
#### Model-free