title: Face detection algorithm for 15x15 pixels face?
body: <p>I'd like to know if you are aware of any algorithm to detect low-resolution faces in an image.
  The image could have any resolution and the faces resolution could be as low as 10x10 or 15x15.
  I am using OpenCV but I don't think the Haar classifiers provided allow me to work with resolutions so small.
  Are there any other alternative?
  Thanks</p>