Google Cloud Vision API: the service enables customers to detect a broad set of entities within an image from everyday objects to faces and product logos. Watch a Raspberry Pi robot that uses the API to demonstrate the API features.
To learn more visit https://cloud.google.com/vision/
The GoPiGo robot is available from http://www.dexterindustries.com/gopigo/
(FYI - they start at approx $99)