Straightening Out Distorted Text Lines of Images
A method for correcting distortions in a scanned image of a page, paragraph, sentence or other portion of text 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.
1 . A computer-readable medium having stored thereon instructions, which when executed by a processing system, cause the processing system to perform a method for correcting distortions in a scanned image of a page, the method comprising:
detecting one or more areas of distortion in the scanned image of the page;
identifying at least one set of collinear elements outside of the one or more areas of distortion in each of a plurality of lines in the scanned image;
from the collinear elements, identifying collinear elements that are words;
identifying a baseline position for each word;
from the baseline positions of the collinear words, identifying a common curvilinear baseline for each of the plurality of lines;
identifying a generally vertical line, wherein the generally vertical line is perpendicular to a maximum number of the common curvilinear baselines and closest to a binding edge in the scanned image of the page;
selecting a starting point in the scanned image, wherein said selecting the start point includes selecting a point in the scanned image which is free of distortion; and
generating a corrected image based on the scanned image by performing steps including:
forming a rectilinear horizontal guideline, one for each of the common curvilinear baselines, in the corrected image;
identifying a starting point in the corrected image at a same horizontal location as that of the starting point in the scanned image; and
moving left and right from the respective starting points, copying the black dots and white dots from the scanned image of the page to the corrected image, wherein the copying of each dot is placed in a same location on or near a rectilinear horizontal guideline as that of the respective curvilinear baseline for each of the plurality of lines.
2 . The computer-readable medium of claim 1 , wherein said copying the black dots and white dots includes copying collinear words on the common curvilinear baselines in the scanned image to a respective location on or near a respective rectilinear horizontal guideline in the corrected image using the first and second start points as reference points.