说明：  经典的灰度共生矩阵纹理计算方法，包括邓氏关联度、绝对关联度、斜率关联度、改进绝对关联度,关于超声波倒车雷达测距的。
( Classic GLCM texture calculation method, Including Deng s correlation, absolute correlation, correlation of slope, improved absolute correlation, About ultrasonic parking radar ranging.)