1. An image processing system for displaying information relating to the amplitude of displacements of wall regions of a deformable 3D object under study, the system comprising: acquisition means for acquiring image data of an image sequence of an organ 3D under study; processing means for: segmenting the 3D organ in the images of the sequence for locating a 3D object wall, defining regions of interest on the segmented 3D organ, and processing the image data to determine an amplitude of displacement of each of said regions of interest as a function of time; and constructing a first 2D simplified representation of the 3D segmented organ wall by projection of the 3D segmented organ wall along an axis, comprising the projections of the regions of interest in said 2D simplified representation; and constructing a second 2D simplified representation of the 3D segmented organ wall, similar to the first 2D simplified representation of the 3D segmented organ wall, and with similar projections of the regions of interest, called segments, the second 2D simplified representation being called 2D simplified phase representation; and display means for: displaying indications of the amplitudes of displacement of the regions of interest of the 3D segmented organ wall in the respective projections of said regions of interest, called segments, in said constructed 2D simplified representation, in a color coded manner; displaying indications of maximal or minimal amplitudes of displacement of each of the regions of interest, over a period of time, the first 2D simplified representation being called 2D simplified amplitude representation; displaying indications of instants of time at which the maximum or minimum of amplitudes of displacements occur in the regions of interest, over said period of time, in said 2D simplified phase representation; and display the 2D simplified amplitude representation and the 2D simplified phase representation together in a same image.