说明：  基于FPGA的方向滤波指纹图像增强算法实现，本文利用FPGA具有丰富寄存器资源、可满足高速系统设计等特点，设计了一种基于FPGA纯硬件方式实现方向滤波的指纹图像增强算法。设计采用寄存器传输级（RTL）硬件描述语言（Verilog HDL），利用时分复用和流水线处理等技术，完成了方向滤波指纹图像增强算法在FPGA上的实现。
(Directional filtering fingerprint image enhancement algorithm based on FPGA using the FPGA has a rich register resources to meet the high-speed system design, design direction filtering a pure hardware FPGA-based fingerprint image enhancement algorithm. The design uses a register-transfer level (RTL) hardware description language (Verilog HDL), time division multiplexing and pipelining technology to complete the realization of the direction of filtering fingerprint image enhancement algorithm on the FPGA.)