METHOD OF PRODUCING RECTIFIED IMAGES OF DOCUMENTS FOLDED IN HALF Russian patent published in 2024 - IPC G06T5/80 

FIELD: physics.

SUBSTANCE: invention relates to processing of digitized documents. Upper half of the image comprises a larger portion of the upper half of the document, and the lower half of the image comprises a larger portion of the lower half of the document, wherein the height is greater than the width, wherein the original image I is divided in half into an upper part I^t and a lower part I^b, a rough approximation of the halves of the document is constructed by two quadrangles, for this purpose, a quadrangle localization algorithm based on detection of boundaries and lines is applied to both halves, output of which is a set of quadrangles sorted by their contour estimate, thus obtaining a plurality of quadrangles Q^t located on I^t, and a plurality of quadrangles Q^b located on I^b, wherein each pair of quadrangles is used to make a hexagon, which would represent the outer boundaries of the folded document on the image, a correction algorithm is applied to each formed and refined hexagon, after which the hexagons are sorted by their contour estimate.

EFFECT: high quality of scanning folded documents with resistance to occlusion of the edge of the document.

1 cl, 27 dwg