Correction of Geometric and Photometric Distortion of Document Images Using a Stereo Camera System

In this paper, we propose a new method for correcting distorted document images using a stereo camera pair. Geometric and photometric distortions may occur in document images of thick book pages because of its curved surfaces. The proposed method acquires document shape by stereo measurement to correct geometric distortions in images. By considering normal vectors of document surfaces, optimum-resolution images are generated as a combination of a stereo image pair. Moreover, the method corrects photometric distortions by analyzing lighting and reflecting conditions. The validity of the proposed method was shown through experiments.