Clarifai is a company that provides image recognition systems for customers to detect near-duplicates and find similar uncategorized images. I tried out the demo of the Facial Recognition section. I found an image of a crowd of people and the Clarifai program detected 29 faces – there were more faces in the photo but they were too blurry.

The ‘Face Detection’ model returns probability scores on the likelihood that the image contains human faces and coordinate locations of where those faces appear with a bounding box. This model is great for anyone building an app that monitors or detects human activity. Please note that this model is currently in BETA testing and may update periodically.