Help to build an OCR using back propagation neural networks

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C#

Hello, I need to built an OCR using back propagation neural networks. What I need are some ideas.

my task is to load a number of .png images that I can train my neural network with, and then with other images I can be able to read the character.

Up till now I am able to load an image and convert it to 1's and 0's using the bitmap function. Now I am stuck I how should use the binary string so that I can use them as inputs to my Neural Network

Please give me some hints. Thanks