1. A method of processing images belonging to a sequence of at least two images having a surface representing an organ or part of an organ which is deformable over time and called the organ surface, said surface including characteristic points, denoted marking points, which correspond from one image to another in the sequence, said method comprising steps of: defining a structure per unit length on one of the images of the sequence, calculating the positions of the marking points on at least two images, successive or not, determining the parameters of an explicit mathematical expression of the deformation of the organ or part of the organ observed between the two images, from the positions of a set of marking points on the two images and the positions of the points of the structure per unit length, applying said explicit mathematical expression to the structure per unit length in order to define the form of the structure per unit length after deformation of the organ between the two images.