Correcting for variable skew in document images

Abstract

The proliferation of inexpensive sheet-feed scanners, particularly in fax machines, has led to a need to correct for the uneven paper feed rates during digitization if the images produced by these scanners are to be further analyzed. We develop a technique for detecting and compensating for this type of image distortion. This technique relies on the detection of multiple prominent skew angles in the document image along with their vertical position on the page, rotating the image by each of those angles and sampling the rotated images to allow reconstruction of the entire page image.