World Journal of Urology

, Volume 8, Issue 3, pp 167–169

PRIAPUS — non-contact monitoring of penile dimension changes by photogrammetry


  • W. F. Thon
    • Department of UrologyHannover Medical School
  • C. G. Stief
    • Department of UrologyHannover Medical School
  • A. E. J. L. Krmer
    • Department of UrologyHannover Medical School
  • F. Leberl
    • Vexcel Corporation
  • U. Jonas
    • Department of UrologyHannover Medical School

DOI: 10.1007/BF01576765

Cite this article as:
Thon, W.F., Stief, C.G., Krmer, A.E.J.L. et al. World J Urol (1990) 8: 167. doi:10.1007/BF01576765


Clinical evaluations to objectify sexual arousal in men use indicators of penile configuration changes. Most common are measurements of changes in circumference and/or rigidity using loops around the penis. To avoid psychogenic disturbance during the investigation, a method was developed that enable non-contact evaluation of penile changes during visual sexual stimulation. A three-dimensional (3-D) real-time computerized imaging system is used for the acquisition and registration of penile configuration changes. Images from two high-precision cameras are digitized using a geometrical and graylevel registration model. The triangulation technique in the stereoscopic approach is used to extract 3-D information. This method of digitized photogrammetry enables non-touch documentation of penile length, diameter, volume, curvature and direction changes during sexual stimulation. The curvature registration also enables objective documentation in patients complaining of penile curvature during erection.

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© Springer-Verlag 1990