Not on a mobile device, but I read that some company is using OpenCV to judge customers reactions to ads shown to them. that is, ads shown on TVs in stores and

Not on a mobile device, but I read that some company is using OpenCV to judge customers reactions to ads shown to them. that is, ads shown on TVs in stores and recording the reactions with a hidden camera and evaluating right away. Wish I could give more details but I can’t find the source any more