利用神经网络进行字符识别。字符识别时模式识别的一个典型应用。本源码将训练BP神经网络使其能过对26个英文字母进行识别。-The use of neural network character recognition. When character recognition of a typical pattern recognition application. The source will be training BP neural network to enable them to have 26 letters of the alphabet to identify.