Method for obtaining surface autocorrelation function by using handheld laser scanner

The invention discloses a method for obtaining a surface autocorrelation function by using a handheld laser scanner, and belongs to the technical field of non-contact detection and surface quality digital analysis. According to the method, firstly, a handheld laser scanner is used for carrying out point cloud data collection on the surface appearance, and data preprocessing is carried out on the point cloud data; then, point cloud reconstruction is carried out on a # imgabs0 # file which is stored disorderly according to data point numbers after preprocessing to form a two-dimensional array form, and # imgabs1 # is a height value at a coordinate (i, j); finally, according to the principle of the least square method, an evaluation reference surface of the surface of the array # imgabs2 # is obtained; and obtaining a surface autocorrelation function # imgabs4 # according to the array # imgabs3 # on the reference plane. The method has the advantages of being high in precision, easy to operate, high in anti-inter