计算十字叉丝的在不同距离的衍射图像,分析了该信号的时域、频域、倒谱，循环谱等,利用matlab针对图像进行马氏距离计算 。- Calculation crosshairs diffraction image at different distances, Analysis of the signal time domain, frequency domain, cepstrum, cyclic spectrum, etc. Using matlab to calculate the Mahalanobis distance for the image.