An image processing method for processing a sequence of images of a distortable 3-D Object, each image being registered at a corresponding image instant within the interval of time of the sequence having steps to construct and display an image of said 3-D Object represented with regions, each region showing a quantified indication relating to its maximal contraction or relaxation within said interval of time. Each region of the constructed and displayed image is attributed a respective color of a color coded scale that is function of the calculated quantified indication relating to the maximum of contraction or relaxation of said region. The quantified indications may be the instant when a face or region has had its maximum of contraction or relaxation; or the phase value corresponding to said maximum; or the delay to attain said maximum.