Using matlab to calculate the Mahalanobis distance for the image, Add noise processing, Since writing the curvature calculation function.

HC-SR04 超声波测距模块可提供 2cm-400cm 的非接触式距离感测功能， 测距精度可达高到 3mm；模块包括超声波发射器、接收器与控制电路(The HC-SR04 ultrasonic ranging module can provide 2cm-400cm's non-contact distance sensing function, and the ranging accuracy can reach up to 3mm. The module includes ultrason