FIR 底通和带通滤波器和IIR 底通和带通滤波器，真的是一个好程序，结合PCA的尺度不变特征变换(SIFT)算法。- Bottom-pass and band-pass FIR and IIR filter bottom pass and band-pass filter, Really is a good program, Combined with PCA scale invariant feature transform (SIFT) algorithm.