The Rekognition Android SDK allows developers to access and integrate the functionality of Rekognition with Android applications and devices. The Rekognition Android SDK uses Java. Rekognition is a cloud-based facial and concept recognition platform.
Google Cloud Vision API gives developers access to powerful image processing and analysis tools for use in any project. This tutorial on Google Cloud Platform shows followers how to use the API to detect faces in an image, and use the returned coordinates to draw a polygon around each face.