How to detect faces with jviolajones library?

Question

I'm trying count faces in the picture with jviolajones library. I want to do this in pure Java with no extra dependencies so OpenCV is not an option. My code is like:

 detector.getFaces("filePath", 1.2f,1.1f,.05f, 2,true);

I've tried haarcascade_frontalface_alt and haarcascade_frontalface_default from OpenCV. But results are bad about 5 pictures recognized good for 30 tested. I've tried adjust parameters but it didn't help. Any suggestion for better results, or maybe another library. I was wondering, maybe I have to prepare pictures before detecting faces?

Answer 1

This works:

detector.getFaces("filePath", 1.2f,1.1f,.05f, 2,true);

But I had to scaled my photos to 640x480 and transform them to gray, this works with haarcascade_frontalface_default.xml classifier from OpenCV.