i am doing project on hand written recognition systems.i need help where to start.......
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3There's a good bit on information on this topic here http://www.codeproject.com/KB/library/NeuralNetRecognition.aspx and there's also a paper on the topic here http://www.cs.utoronto.ca/~hinton/absps/ijcai05.pdf . This isn't really my area, but honestly your question is really open-ended and kind of hard to answer. This is a fairly large topic, however, so you should be able to find something in university papers like the one I linked or in any discussions of currently implemented systems like Palm's, for example.
If I were interested in a project like that I think I would like...I dunno...go to the library and get some books or something.
Start with understanding of "What is a neural network" ?
What are its various types and properties of each network type
Then, learn about feedback mechanism and understand error propagation and learning mechanism through hidden layers
Then create a tree - based data structure in C/C++ and try to have network representation in your model