Patent ID: 6970592
Filing Date: 2005-11-29
Classification: G06K,G06T,H04N

Abstract:
1. A distortion correction device, comprising: an outline extraction device extracting an outline of a piece of rectangular paper from an input image obtained by photographing the paper; a curved-surface estimation device estimating a three-dimensional curved-surface model of the paper using distortion of the outline as a clue; and a distortion correction device correcting the distortion based on the three-dimensional curved-surface model and outputting a corrected image as an output image; and wherein said curved-surface estimation device estimates a three-dimensional curved-surface model by expressing a restriction that a horizontal or vertical pair of length of three-dimensional outlines are the same with an energy function and solving an optimization problem of calculating a parameter of the three-dimensional curved-surface model, the energy of which becomes a minimum.