Method for processing an image showing a structured document comprising a visual inspection zone from an automatic reading zone or of barcode type

A method for processing an acquired image showing a structured personal document belonging to an owner, the structured personal document comprising a visual inspection zone, the method comprising:

• determining a first character string from an automatic reading zone or of barcode type having a predetermined format and being different to the visual inspection zone, wherein the first character string represents at least one portion of a personalised information specific to the owner of the structured document,
• generating, from the first character string determined, an intermediate image showing a second character string representing the same portion of personalised information,
• detecting in the acquired image a third character string contained in the visual inspection zone, the third character string representing at least one portion of the same personalised information, the detection comprising a comparison of the intermediate image with a portion of the acquired image in the visual inspection zone,
• locating in the visual inspection zone a region of interest of the acquired image containing the third character string,
• the method further comprising performing a character recognition in the located region of interest, comprising:
• repeating the generating step from the first character string so as to obtain several intermediate images showing the second character string representing the same portion of personalized information but under different predetermined representations,
• repeating the detecting and locating steps for each intermediate image generated,
• for each intermediate image, estimating a matching index between the intermediate image and located region of interest,
• selecting the intermediate image for which a maximal matching index has been estimated from the estimated matching indices,
• performing the character recognition step selectively in the located region of interest on the basis of the selected intermediate image.