Patent ID: 7974463
Filing Date: 2011-07-05
Classification: G06T,H04N

Abstract:
1. A method of compensating for distortion in a digital image, comprising: projecting an unstructured pattern onto a document using a projector; capturing a pair of stereoscopic images of the unstructured pattern projected onto the document using one or more stereoscopic cameras; generating a plurality of lines in each of the stereoscopic images, each line comprising a plurality of non-overlapping regions of the stereoscopic images, the plurality of non-overlapping regions having a first height equal to a second height of each line, and rectifying the pair of stereoscopic images relative to each other such that each line in a first stereoscopic image of the pair of stereoscopic images corresponds to a line in a second stereoscopic image of the pair of stereoscopic images; cross-correlating portions of the pair of stereoscopic images to identify corresponding portions in the pair of stereoscopic images, the cross-correlating being achieved based on image data from the stereoscopic images without specification of the unstructured pattern; capturing a digital image of the document using an imaging camera; constructing a three-dimensional model of a surface of the document; and compensating for distortion in the digital image by rectifying the digital image based on spatial data provided by the three-dimensional model.