The surface is an important component of many technical parts to ensure tribo-technical functions. Development of new types of coatings and their deposition methods provides technically exploitable coatings with good tribological properties. In experiments in addition to conventional parameters such as friction coefficient, temperature, etc. are analyzed the surface properties in friction and wear area before and after the tribological tests using different methods and analysis. The paper deals about the possibilities of image analysis methods, using the Matlab Image Processing Toolbox, obtained by SEM for coatings based on DLC/CN to document the morphology of the surface before the tribological test. By the geometric properties modifications and applications of a wider spectrum of sophisticated operations and algorithms in image analysis have been made about the surface morphology of coatings analyzed.