> For the complete documentation index, see [llms.txt](https://docs.youquantified.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.youquantified.com/devices/video-heart-rate.md).

# Video Heart Rate

To estimate the heart rate from video we are using an open-source algorithm that masks the face from the video using ML models and uses image-processing methods to track subtle changes in color and try to infer a person's heart rate. This method is often known as rPPG (remote photopletismography).

{% hint style="info" %}
Video heart rate can be greatly influenced by camera quality and lighting conditions. It's best to avoid over or under-exposing the frame.
{% endhint %}

### Output

* Heart Rate: a single number representing the estimated heart rate.

## Attribution

{% embed url="<https://github.com/prouast/heartbeat-js/tree/master?tab=readme-ov-file>" %}