Method for identifying a sign on a deformed document

Method for identifying at least one sign on at least one image of a document that can be deformed,

• said method being implemented by a data processing device able to be connected to a first storage device and characterised in that it comprises steps of:
• acquiring (E1) said at least one digital image of said document;
• determining (E2) in the acquired image at least one sub-part of the image acquired, referred to as candidate sign region, using an image segmentation algorithm,
• for each candidate sign region, calculating (E3) a signature comprising a piece of information concerning the location in the acquired image of said candidate sign region and a region descriptor concerning the local characteristics of the image in said region,
• identifying (E4) at least one sign on said at least one image of said document using the calculated signatures,
• said step of identifying comprising jointly a comparison (E41) of the calculated signatures with reference signatures concerning sign regions of document models stored in the first storage device, said comparison being carried out according to a geometric deformation model of said document, and an estimation (E42) according to said comparison of said geometric deformation model.