Développement d'un scanner 3D multispectral Development of a 3D multispectral scanner

and key words In this paper, a new technique of scanning is proposed. It is based on a stereoscopic set composed of a structured light projector and a multispectral camera. Such a set can give the 3D information of a point like a scanner but can add accurate information about the spectral reflectance of this point. This set must be calibrated before using it. It is done by two steps: the first one is the spectral characterization of the couple illuminant and camera ; the second allows geometrically calibrating the complete set. Afterwards, the image acquisition can begin. A first multispectral image of the scene is obtained without projection of structured light. Then, with a LCD projector, a luminous line scans the scene. For each line, a grey level image is acquired. The use of the geometrical calibration parameters allows the processing of the three-dimensional traitement du signal 2004_volume 21_numero special L'image numerique couleur 707

[1]  Dorian Garcia,et al.  Accurate Calibration of a Stereovision Sensor: Comparison of Different Approaches , 2000, VMV.

[2]  Flavio Prieto.  Métrologie assistée par ordinateur : apport des capteurs 3D sans contact , 2000 .

[3]  Peter D. Burns,et al.  ANALYSIS OF IMAGE NOISE IN MULTISPECTRAL COLOR ACQUISITION , 1997 .

[4]  Roy S. Berns,et al.  Comparative Study of Metrics for Spectral Match Quality , 2002, CGIV.

[5]  D. Marquardt.  An Algorithm for Least-Squares Estimation of Nonlinear Parameters , 1963 .

[6]  R. Horaud,et al.  Vision par ordinateur: outils fondamentaux , 1995 .

[7]  Francis J. M. Schmitt,et al.  A fully automatic method for the reconstruction of spectral reflectance curves by using mixture density networks , 2003, Pattern Recognit. Lett..

[8]  Joaquim Salvi,et al.  Recent progress in coded structured light as a technique to solve the correspondence problem: a survey , 1998, Pattern Recognit..

[9]  Jon Yngve Hardeberg.  Acquisition and reproduction of colour images: colorimetric and multi-spectral approaches , 1999 .

[10]  Marc Levoy,et al.  Real-time 3D model acquisition , 2002, ACM Trans. Graph..

[11]  Hans Brettel,et al.  Multispectral color image capture using a liquid crystal tunable filter , 2002 .

[12]  Francisco H. Imai,et al.  Comparison of the accuracy of various transformations from multi-band images to reflectance spectra , 2002 .

[13]  Hans Brettel,et al.  Multispectral Image Acquisition and Simulation of Illuminant Changes , 1998 .

[14]  R. Berns,et al.  A Comparative Analysis of Spectral Reflectance Estimated in Various Spaces Using a Trichromatic Camera System , 2000, Journal of Imaging Science and Technology.

[15]  Zhanyi Hu,et al.  Projector-Camera Based System for Fast Object Modeling , 2003 .