To create a font mapper to use with the OCR engine please see the below example.

Attached is a simple example of how to create a "Font Mapper" you can add this code to your project but please see the notes below.

You probably want to change the namespace from YourFavoriteNameSpace to something appropriate.

You can install it by doing this:

public void InstallNewFontMapper(OcrEngine engine)
{
     engine.FontMapper = new SimpleFontMapper();
}

Original Article:
Q10214 - HOWTO: Font Mapping