This is the same
question[
^] you've had asked yesterday (or day before) and I have already posted an answer for reading the characters from an image. You need to use an OCR (Optical Character Recognition; recognizer) to read the characters from an image.
That is a sample
project[
^] I have provided a link for, and you can download it in C++ and C# language. You would get the idea of building the project for yourself.