Recognition the Manmade Target and Natural Object with the Fractal Based on Contour

According to the innate difference between manmade targets and natural objects,an algorithm to abstract the rough profile of contour was presented.The variation algorithm was used to calculate the fractal dimension (FD) of the rough profile of contour of the actual image.Compared with the two dimension FD, the methos are fast and simple,the experiment result shows it is feasible to classify manmade targets and natural objects by the FD of the rough profile of contour.