采用按时间抽选的基4原位算法和坐标旋转数字式计算机（CORDIC）算法实现了一个FFT实时谱分析系统。整个设计采用流水线工作方式，保证了系统的速度，避免了瓶劲的出现；整个系统采用FPGA实现，实验表明，该系统既有DSP器件实现的灵活性又有专用FFT芯片实现的高速数据吞吐能力，可以广泛地应用于数字信号处理的各个领域。-time selected by using the in-situ-4 algorithm and coordinate rotation digital computer (CO

This study proposes a novel near infrared face recognition algorithm based on a combination of both local and global features. In this method local features are extracted from partitioned images by means of undecimated discrete wavelet transform