1. An imaging processing method which enables an elasticity image of a body including a cavity to be produced depending on material(s) forming the body, wherein the method comprises: receiving a deformation image illustrating a field of movement of points of the body depending on a pressure difference in the body; estimating a shape function of the body from the deformation image; and calculating an elasticity image of the body depending on of the shape function, of the pressure difference, and of the deformation image.