Image Correction Device Image Correction Method and Recording Medium

Abstract

The present invention provides an image correction device for correcting the distortion of an image obtained by photographing a predetermined object, based on the positional relationship of each point on the predetermined object in the image in two-dimensional space and the photographing angle relative to the surface of the predetermined object. For the positional relationship of each point in three-dimensional space, the deformation information of the image reflecting the determined positional relationship of each point in three-dimensional space is obtained, and the deformation of the image is corrected based on the obtained deformation information. The determination unit is based on the relationship between the shape line in the column direction and the shape line in the row direction set in consideration of the characteristics of the character string on the plane of the plane part of the predetermined object in the image, and the movement direction of each point on the three-dimensional space. Assuming that a plurality of micro-intervals is determined, the acquisition unit acquires deformation information of the plurality of micro-intervals determined by the determination unit, and the correction unit deforms the plurality of micro-intervals according to the deformation information acquired by the acquisition unit to correct the distortion of the image.

Description

technical field [0001] The present invention relates to a technique for correcting distortion of a predetermined object in an image obtained by photographing the predetermined object. Background technique [0002] When the information (characters, graphics, etc.) recorded on the surface of a deformable subject (prescribed object) such as a paper medium (such as a notebook or a book) is photographed and stored as an image, it is possible to implement the Keystone correction to obtain an image that reflects the original shape of the subject. [0003] In addition, in this specification, such a subject may be referred to as a "manuscript", and the term "manuscript" at this time does not refer to a draft or draft, but refers to the paper medium itself that becomes the subject of photography. [0004] However, when an original is photographed, if there is a three-dimensional deformation (overall curvature, irregular local curvature) in the original, if only trapezoidal deformatio...

AI Technical Summary

Problems solved by technology

[0006] However, in the above-mentioned technique, the intersection points of the aforesaid plurality of vertical lines and the plurality of horizontal lines are set according to specific criteria determined according to the presupposed deformation state of the original, and do not directly reflect the three-dimensionality of each part of the original. deformed point

Therefore, when there is a local deformation in the original that is not assumed, there is a problem that the deformation in this part cannot be corrected with high precision.

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