Xamarin.Forms - Face Detection Using Cognitive Service

In this article you will learn how to detect human faces using Cognitive Service in Xamarin forms. Xamarin.Forms code runs on multiple platforms - each of which has its own filesystem. This means that reading and writing files is most easily done using the native file APIs on each platform. Alternatively, embedded resources are a simpler solution to distribute data files with an app.

source https://www.c-sharpcorner.com/article/xamarin-forms-face-detection-using-cognitive-service/