1. A method comprising: encoding a sequence of images with an encoding device, delivering a signal having a layered organization comprising at least one base layer and one enhancement layer, an enhancement layer corresponding to a level of resolution of an image of said sequence higher than the level of resolution of at least one preceding layer, and being encoded by prediction at least from said at least one preceding layer, wherein during encoding the encoding device implements, for at least one current image of said sequence, a step of building a hierarchical epitome associated with the enhancement layer corresponding to a level of maximum resolution of said current image, from: an epitome associated with the enhancement layer corresponding to the level of maximum resolution of the current image; and at least one epitome associated with a preceding layer corresponding to a level of resolution lower than said level of maximum resolution of said current image.