Satellites in the orbit of Mars planet provide thousands of images of its surface. Typically these images are analyzed by experts that select relevant features and generate textual reports containing the result of their observations. Nevertheless, the database of images has grown up and currently this procedure is not effective enough. As a result of our research on Computational Theory of Perceptions, we describe a computational application able to generate simple linguistic descriptions of circular structures on the Mars' surface. We include several examples and analysis of the obtained results.