Patent ID: 7251380

Claim:
An adjustment method of a machine-readable form model and a filled form scanned image thereof in the presence of distortion, comprising the steps of: constructing the form model in electronic form describing spatial correlation and parametrical properties of the form objects free of distortion; receiving a filled form image in electronic form obtained by means of optical input from a paper medium; said form model comprising at least reference points spatial characteristics information, data input fields' spatial or parametrical characteristics information; representing said received form image in the form of bit-mapped image, comprising at least reference points images, data input fields images, inputted data images into the input fields, distortion, caused by an external devices, on form transferring from electronic into paper form or vice versa; said method further comprising the following steps: assigning either form of image or form of model as changeable form, that would be subjected to changes, with the simultaneous assignment of the other said form as non-changeable, not subjected to changes, marking out on the non-changeable form one or more non-overlapped regions, covering the areas with distortion, the size of the said region to be greater than the covered area with distortion, marking on the changeable form regions corresponding to those on the non-changeable form, dividing of all variety of objects, that can be present on the form, into several types differing in reliability level of identification, assigning each object image, present on the form of image, a reliability level of identification in accordance with its type, for each selected region, and for each type of object, beginning from the highest level of identification reliability, step by step decreasing the said level to the lowest one, performing the following steps: setting the correspondence between identical objects of image form and model form, computing distortion correction factors of the spatial parameters for each object of selected level, present on the changeable form, spatial parameters correction of the changeable form, on the base of the said factors, affecting objects of the same identification reliability level and lower; performing the subsequent form image processing, wherein the subsequent form image processing comprises at least text recognition in the input fields of the form.