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2008-06-01 - Article/Dans un journal sans peer-review - Anglais - 9 page(s)

Sebbe Raphaël, Bagein Michel , Belanger Lucie, Chessini Ricardo, Dechristophoris Johan , Demeyer Jonathan, Lecaude Nathanaël, Thillou Céline , Moinet Alexis , "Project #4: Visual Paths" in QPSR of the numediart research program, 1, 2, 43-51

  • Codes CREF : Techniques d'imagerie et traitement d'images (DI2770)
  • Unités de recherche UMONS : Théorie des circuits et Traitement du signal (F105), Electronique et Microélectronique (F109)
  • Instituts UMONS : Institut NUMEDIART pour les Technologies des Arts Numériques (Numédiart)
Texte intégral :

Abstract(s) :

(Anglais) The goal of this project is to build a vision-based system for creating real time curves in 3D space, to be used as input on scene, both for event generation and special effect rendering. The system is composed of at least two cameras that are located in front of a 3D region of interest where infrared (IR) LED pens are agitated. The cameras are sensitive to IR, and a filter is used to cut off disturbing visible light. A camera calibration software based on geometric pattern recognition is implemented, whose role is to determine intrinsic (focal length and lens distortion) and extrinsic (relative transform against the pattern coordinate system) parameters, leading to a correspondence between image coordinates and scene rays in 3D. Image processing is used to segment and locate the LED pen’s center on each camera image (blob segmentation). GPU image processing is used to enforce real time performance, combined to more conventional CPU based higher level primitive handling. 3D rays are derived in scene space from 2D image coordinates and combined to retrieve the position of the pen in 3D. Portable IR LED pens are built as ON/OFF battery powered units.