Locating Projectors Using Intensity of Reflected Beams Based on Phong Shading Model

  • Yukio Ishihara
  • Makio Ishihara
Part of the Communications in Computer and Information Science book series (CCIS, volume 174)


Abstract. In this work we focus on handheld projector-camera systems and discuss how to find out where and in which orientation those projectors are. We propose a way to find out them by measuring the intensities of the beams reflected on the screen. The point is that our system does not rely on fiducial markers which are usually stuck on the screen to help to locate the projector. Additionally, in our system, a laser-based projector is used, and the intensity of beams being projected and reflected on the screen is modeled based on Phong shading model. Through the evaluation, we show the potential of our system in HCI areas.


beam intensity Phong shading model laser-based projector real-time calibration projector-camera system 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Sukthankar, R., Stockton, R.G., Mullin, M.D.: Automatic keystone correction for camera-assisted presentation interfaces. In: Tan, T., Shi, Y., Gao, W. (eds.) ICMI 2000. LNCS, vol. 1948, pp. 607–614. Springer, Heidelberg (2000)CrossRefGoogle Scholar
  2. 2.
    Chen, H., Sukthankar, R., Wallace, G., Li, K.: Scalable alignment of large-format multi-projector displays using camera homography trees. In: Proc. VIS 2002 IEEE Computer Society, pp. 339–346 (2002)Google Scholar
  3. 3.
    Beardsley, P., Baar, J.V., Raskar, R., Forlines, C.: Interaction Using a Handheld Projector. IEEE Computer Graphics and Applications 25(1), 39–43 (2005)CrossRefGoogle Scholar
  4. 4.
    Rehg, J.M., Flagg, M., Tat-Jen, C., Sukthankar, R., Sukthankar, G.: Projected light displays using visual feedback. In: Proc. ICARCV 2002, vol. 2, pp. 926–932 (2002)Google Scholar
  5. 5.
    Ishihara, Y., Ishihara, M.: Locating a projector using the strength of beams reflected on a screen. In: Proc. AUIC 2007, vol. 64, pp. 47–50. Australian Computer Society, Inc. (2007)Google Scholar
  6. 6.
    Phong, B.T.: Illumination for computer generated pictures. Communications of the ACM 18(6), 311–317 (1975)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Yukio Ishihara
    • 1
  • Makio Ishihara
    • 2
  1. 1.Innovation Center for Medical Redox NavigationKyushu UniversityHigashi-kuJapan
  2. 2.Faculty of Information EngineeringFukuoka Institute of TechnologyHigashi-kuJapan

Personalised recommendations