SmartEagle uses optical sensors. The data from the different sensors are combined with each other to get an overall picture of the occupation of the space.
Artificial Intelligence has been used to do this.
The optical sensors register images, but do not store them in a database. The visual data is directly coded thanks to Machine Learning (read: It is a human, laptop, telephone or something else) and then only this data is put in the database. Identification of a specific person is not possible based on these data.