基于神经网络的文字识别系统，关键技术：灰度化，二值化、图像缩放、细化、平滑等，最后还用了神经网络对提取到的数字信息进行分析判断。-Neural network based character recognition system, key technologies: grayscale, binary, image scaling, thinning, smoothing, and finally extracted with a neural network to analyze digita