Device, method, and scanner correcting document image using correcting mesh constructed according to vertical and horizontal boundaries and adjusted extended filtered lines

摘要

Embodiments of the present invention provide a device and method for correcting a document image and a scanner. Wherein the device includes: an extracting unit configured to extract boundaries in a first direction of the document image and extract lines in the first direction according to a content of the document image, a filtering unit configured to filter the extracted lines, a constructing unit configured to extend and adjust the filtered lines and construct a correcting mesh, and a correcting unit configured to perform correcting according to the correcting mesh. An accurate correcting model can be constructed by taking document boundaries and document contents into account in constructing the correcting model and constructing a correcting mesh after filtering, extending and adjusting the extracted lines, thereby effectively eliminating distortion in the document image.

主权项

1. A device for correcting a document image, comprising:
an extracting unit configured to extract first boundaries in a first direction of the document image, determine second boundaries in a second direction of the document image according to the first boundaries in the first direction, and extract lines in the first direction according to a content of the document image, where the first direction is one of a horizontal direction and a vertical direction of the document image, and the second direction is perpendicular to the first direction; a filtering unit configured to filter the lines in the first direction such that a difference between shapes of filtered lines and the first boundaries in the first direction is within a predetermined range; a constructing unit configured to extend the filtered lines to the second boundaries in the second direction according to the first boundaries in the first direction, adjust extended lines of the filtered lines according to adjacent lines adjacent to the filtered lines in the second direction and/or the first boundaries in the first direction, and construct a correcting mesh according to the first boundaries in the first direction and the second boundaries in the second direction and lines of which the extended lines have been adjusted; and a correcting unit configured to correct the document image according to the correcting mesh.