Rear-illuminant Scanning

We have developed a system that can acquire and restore not only a distorted single-page document, but also more complicated multilayer film negatives. In this work, we demonstrate a new image-based document acquisition system, based on single-scatter diffuse transmission, that captures the intrinsic intensity information and shape distortion of documents. Using a simple to build and costeffective camera and LCD system, the data is acquired to allow for automatic photometric and geometric correction of most documents. We show the results of our system with single-sheet nonplanar documents. Furthermore, to show the robustness of this system, we demonstrate the restoration on safety acetate film negatives over 70 years old that have been damaged due to shrinkage and other forms of deterioration.
  • George V Landon, W. Brent Seales and Duncan Clarke. A New Technique for the Digitization and Restoration of Deteriorated Photographic Negatives, EURASIP Journal on Image and Video Processing, Vol. 2009, Article ID 217016, 13 pages, 2009.
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  • Landon, G. V., Seales, W. B., and Clarke, D. A new system to acquire and restore document shape and content. In Proceedings of the 5th ACM/IEEE international Workshop on Projector Camera Systems (Marina del Rey, California, August 10 - 10, 2008). PROCAMS '08. ACM, New York, NY, 1-8.
  • George V. Landon, Innovative Techniques for Digitizing and Restoring Deteriorated Historical Documents (PhD dissertation, University of Kentucky, 2008).
  • "This material is based upon work supported by the National Science Foundation under Grant No. IIS-1008285." "Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation."
  • Geospatial Narratives

    This project has developed a novel framework for online multimedia editions of geospatial narratives with specific support for translated texts. The framework user interface presents textually and geospatially synchronized multilingual manuscripts with audio-narration augmented by maps and images all linked with geo-tagging metadata. The initial test-bed for this framework is built upon the recently completed Italian critical edition and the first English translation of Lorenzo di Filippo Strozzi's Pistola fatta per la peste, a 1522 walking tour of Renaissance Florence during a plague outbreak.
  • George V. Landon, William J. Landon, and Christian L. Snodgrass. 2010. A geospatial narrative framework: breathing new data into historical manuscripts. In Proceedings of the second workshop on eHeritage and digital art preservation (eHeritage '10). ACM, New York, NY, USA, 43-48. DOI=10.1145/1877922.1877935 (PDF)
  • Document Acquisition/Restoration

    Creating uniform lighting for archival-quality document acquisition remains a non-trivial problem. We propose a novel method for automatic photometric correction of nonplanar 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.
  • George V. Landon, Toward Digitizing All Forms of Documentation, D-Lib Magazine, Vol. 15, No. 3/4 (March/April 2009).
  • George V. Landon, Yun Lin, and W. Brent Seales. Towards automatic photometric correction of casually illuminated documents. 2007 IEEE Computer Society Conference on Computer Vision and Pattern Recognition (CVPR 2007), 18-23 June 2007, Minneapolis, Minnesota, USA.
  • M. Sun and R. Yang and L. Yun and George Landon and W. B. Seales and M. S. Brown. Geometric and Photometric Restoration of Distorted Documents. In International Conference on Computer Vision 2005, volume II, pages 1117-1123, 2005.
  • Yun Lin, George V. Landon, and W. Brent Seales. Developing a Framework for Acquisition, Preservation, and Dissemination of 3D Documents. Technical Report TR-463-06, Department of Computer Science, University of Kentucky, Lexington, KY, December 2006.
  • Digital Museums

    The digitization of antiquities is facilitating a renaissance for scholars who have unprecedented access to rich representations of objects. Cultural Heritage digitization is a central challenge, and its subtleties are intertwined with object properties and the constraints of physical access and handling. In this paper, we present the design and analysis of a system built for the digitization of Puerto Rican petroglyphic iconography. The petroglyphs exhibit unique properties (shape, size, surface) that determine system design choices. The 3D models obtained with the system support new scholarly and educational activities, including interactive surface lighting, feature highlighting and annotation through mark-up, and immersive viewing using large-scale displays.
  • George V. Landon and W. Brent Seales. Petroglyph digitization: enabling cultural heritage scholarship. Machine Vision and Applications. 17:6, pages 361-371, Springer Berlin / Heidelberg, December, 2006.
  • George V. Landon and W. Brent Seales. Building and Visualizing 3D Textured Models for Caribbean Petroglyphs. In 21st Congress of The International Association of Caribbean Archaeology (Trinidad and Tobago), July 2005.
  • George V. Landon and W. Brent Seales. New methods for rock art recording and virtual analysis. In Michael A. Cinquino, Michele H. Hayward, and Lesley-Gail Atkinson, editors, Rock Art of the Caribbean . The University of Alabama Press. July 2009.
  • W. Brent Seales and George V. Landon. The Museum and the Media Divide: Building and Using Digital Collections at the Instituto de Cultura Puertorriqueña. In D-Lib Magazine, volume 11, May 2005.
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  • Graphical Passwords

    Psychological studies have shown a substantial improvement of performance in remembering (recalling and recognizing) pictorial representations of materials over verbal ones. The motivation behind exploring a graphical password scheme was based on the remarkable ability of humans to recall pictures. In this paper, we present a novel, user-friendly, recall-based graphical password scheme, R-DAS, where the user is allowed to rotate the canvas on which he draws the password. We perform an analysis that shows that rotation, as an added degree of freedom, not only increases the full graphical password space, but more importantly increases the predictable graphical password space corresponding to the number of components (strokes). With the visually obvious technique of rotation, R-DAS provides greater security than existing schemes built using the Draw-A-Secret scheme without compromising user convenience.
  • Saikat Chakrabarti, George V. Landon, Mukesh Singhal. Graphical Passwords: Drawing a Secret with Rotation as a New Degree of Freedom. Fourth IASTED Asian Conference on Communication Systems and Networks (AsiaCSN 2007), Phuket, Thailand, April 2-4 2007, ACTA Press, pp. 561-173.
  • Medical Applications of Computer Vision

    Three-dimensional reconstruction of anatomy from in-vivo video remains one of the great unsolved problems of visualization for minimally invasive surgery. Technological constraints in computing power, as well as imaging constraints due to specularities, color, and movement, put this goal beyond the reach of current algorithms. However, a subset of this problem, namely the ability to take accurate anatomical measurements, can be enabled using stereoscopic endoscopes and well-known computer vision techniques. Accurate calibration of the endoscopic camera is key to compensating for the complexities of the lens system and the high degree of image distortion present.
  • Matthew Field, George Landon, Duncan Clarke, Adrian Park, and W. Brent Seales. Stereo Endoscopy as a 3-D Measurement Tool. 2009 Emerging Technology Session of the Society of American Gastrointestinal and Endoscopic Surgeons (SAGES). Phoenix, Arizona, USA, April 22-25 2009.