基于QT实现的指纹识别系统，包括平滑，归一化，计算方向场，计算脊线频率，计算有效区域，图像增强，二值化，细化，提取细节等关键技术源码-Fingerprint identification system based on QT implementation, including smooth, normalization, calculate the direction field, computing ridge line frequency, the effective area, image