Image processing method for displaying an image sequence of a deformable 3-D object with indications of the object wall motions comprising steps of acquiring image data of an image sequence, segmenting the 3-D object in the images of the sequence for locating the wall of the 3-D object, and coloring voxels or parts of the wall in function of their displacement with respect to the wall of the 3-D object in one image of the sequence chosen as a reference. Color images of the 3-D object with color coded voxels or parts of the wall are displayed in a sequence for the user to estimate the object wall motion. This method is used in medical examination apparatus for studying ultrasound images of organs whose walls have motion.