Abbyy Development Inc.

Abbyy Software Limited

Abbyy Production LLC

Olga Arnoldova Kacher

Vladimir Rybkin

Ivan Germanovich Zagaynov

The current document is directed to methods and systems that acquire an image containing text with curved text lines to generate a corresponding corrected image in which the text lines are straightened and have a rectilinear organization. The method may include identifying a page sub-image within the text-containing image, generating a text-line-curvature model for the page sub-image that associates inclination angles with pixels in the page sub-image, generating local displacements, using the text-line-curvature model, for pixels in the page sub-image, and transferring pixels from the page sub-image to a corrected page-sub-image using the local displacements to construct a corrected page sub-image in which the text lines are straightened and in which the text characters and symbols have a rectilinear arrangement.

Method and system for preparing text images for optical-character recognition

Methods for correcting distortions in an image including text, or an image of a page that includes text, are disclosed. The methods include identifying reliable and substantially straight lines from elements in the image. Vanishing points are determined from the lines. Parameters associated with a rectangle are determined. A coordinate conversion is performed.

Straightening out distorted perspective on images

The invention provides various methods and techniques for binarizing an image, generally in advance of further processing such as optical character recognition (OCR). One step includes establishing boundaries of image objects of an image and classifying each image object as either suspect or non-suspect. Another step includes creating a local binarization threshold map that may include or store threshold binarization values associated with image objects classified as non-suspect. Yet another step includes expanding the local binarization threshold map to cover the entire image thereby creating a global binarization threshold map for the entire image. The methods and techniques are capable of identifying and working with separation objects and incuts in images.

Binarizing an image

In one embodiment, a method for correcting distortions in a scanned image of a page is disclosed. The method comprises identifying at least one set of collinear elements in the scanned image; and generating a corrected image based on the scanned image including for at least some of the collinear elements in each set applying a spatial location correction to position all collinear elements in the set on a common horizontal rectilinear base line in the corrected image.

Method and system for straightening out distorted text-lines on images

In one embodiment, the invention provides a method for binarizing an image. The method comprises establishing boundaries of image objects of the image and classifying each image object as either suspect or non-suspect. The method further comprises creating a local binarization threshold map comprising threshold binarization values associated with image objects classified as non-suspect and then expanding the local binarization threshold map to cover the entire image thereby to create a global binarization threshold map for the entire image.

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Moscow, Russia

Olga Arnoldova Kacher