Engineering and Computer Science Faculty Publications

Towards Automatic Photometric Correction of Casually Illuminated Documents

Document Type

Conference Proceeding

Publication Date

7-16-2007

Journal Title

IEEE Conference on Computer Vision and Pattern Recognition

ISSN

1063-6919

DOI

10.1109/CVPR.2007.383254

Abstract

Creating uniform lighting for archival-quality document acquisition remains a non-trivial problem. We propose a novel method for automatic photometric correction of non-planar documents by estimating a single, point light-source using a simple light probe. By adding a simple piece of folded white paper with a known 3D surface to a scene, we are able to extract the 3D position of a light source, automatically perform white balance correction, and determine areas of poor illumination. Furthermore, this method is designed with the purpose of adding it to an already implemented document digitization pipeline. To justify our claims, we provide an accuracy analysis of our correction technique using simulated ground-truth data which allows individual sources of error to be determined and compared. These techniques are then applied on real documents that have been acquired using a 3D scanner.

Keywords

Photometry, light sources, shape, probes, cameras, reflectivity, lighting, image restoration, optical attenuators, layout

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