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add model-free image

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@ -153,6 +153,11 @@ This approach attempts to model the human body in order to track the different p
Model-free approaches don't try to model the human body but instead use the whole motion of human silhouettes. This gives a few advantages, namely it works regardless of camera quality and it takes significantly fewer resources. Model-free approaches don't try to model the human body but instead use the whole motion of human silhouettes. This gives a few advantages, namely it works regardless of camera quality and it takes significantly fewer resources.
<figure markdown>
![Diagram showing the process of turning raw camera input into a silhouette useful for giat recognition](../assets/images/biometrics-explained/model-free-gait.webp)
<figcaption>Yousef, R.N., Khalil, A.T., Samra, A.S. et al. Model-based and model-free deep features fusion for high performed human gait recognition. J Supercomput 79, 12815–12852 (2023). <a href="https://doi.org/10.1007/s11227-023-05156-9">https://doi.org/10.1007/s11227-023-05156-9</a></figcaption>
</figure>
### Accelerometer ### Accelerometer
Accelerometers such as those found in your smartphone can also be used for gait recognition. Accelerometers such as those found in your smartphone can also be used for gait recognition.