1. A method for identifying at least one sign on at least one digital image of a document that can be deformed, said method being implemented by a processor able to be connected to a first storage device, said method comprising: acquiring (E 1 ) said at least one digital image of said document; determining (E 2 ) in the acquired digital image at least one sub-part of the acquired digital image, referred to as candidate sign region, using an image segmentation algorithm, for each candidate sign region, calculating (E 3 ) a signature comprising location information in the acquired digital image, and a region descriptor concerning local characteristics of the acquired digital image in said candidate sign region, identifying (E 4 ) at least one determined candidate sign region in the acquired digital image as a sign region, said step of identifying comprising a matching of said determined candidate sign region with a reference sign region of a document model stored in the first storage device, said matching being carried out by comparing (E 41 ) the calculated signature of each candidate sign region with reference signatures corresponding to reference sign regions of document models, the step of identifying also comprising an estimation (E 42 ) of a geometric deformation model of said document, wherein said matching and said estimation are carried out concomitantly, each match between one of the determined candidate sign regions and one of the reference sign regions being carried out according to the geometric deformation model of the document, said geometric deformation model being estimated as a function of previously found matches.