仅使用Android应用程序的指纹图像

I want to just capture only finger prints. Requirement is, those prints should have clear prints , black and white.! So user should able to read it properly manually. Does it possible to to capture using mobile camera and them image processing to covert RGB to black & white ? Please guide me with good example. Or any other option to archive above requirements.I want to just capture only finger prints. Requ