This paper present a real case study of an intelligent car. There exist an important number of applications, wherein it is required to recognize some plan forms. In these applications, but also in the case that the forms aren't anymore plans, the contour of the forms is an important descriptor from which we can leave in the process of similarity finding between the objects represented by the respective forms in the digital images. By leaving from the contour of the form, there exist many possibilities to describe the forms.