i writing program when given image of low level math problem (e.g. 98*13) should able output answer. numbers black, , background white. not captcha, image of math problem. the math problems have 2 numbers , 1 operator, , operator +, -, *, or /. obviously, know how calculating ;) i'm not sure how go getting text image. a free library ideal... although if have write code myself manage. try post regarding using c++ google tessaract ocr lib in c# ocr tesseract interface