I remember this article but don't remember if I tried to implement and test working with Unicode. You should better ask the author of your questions to the article. Add a comment with your question on the article page. The author will get a notification and a chance to answer you.
But I certainly tried some works and successfully obtained recognition of Unicode characters. I want to bring some more CodeProject articles on the topic to your attention. Please see my past answers:,
Apply online handwriting on neural network[
^],
i need an ocr for a camera image capture[
^].
Good OCR with the source code is hard to find. However, such works do exist and can be used for Unicode OCR. So far, I saw wonderful works on CodeProject, but all I tried needed some more development, to create a usable OCR system.
—SA