![](http://annachin.digital.conncoll.edu/wp-content/uploads/2020/04/Filter3.png)
When a face recognition algorithm searches for a face, it looks for a certain amount of ‘landmarks’ that are found in a face.
If these landmarks are covered up by a color not found in a face (in this case, I use a florescent green), this will confused the algorithm as it searches for the landmarks of a face.
Put this filter onto a photo at the algorithm will not be able to find a face to track.
![](http://annachin.digital.conncoll.edu/wp-content/uploads/2020/04/Filter3C-724x1024.png)