BIB-VERSION:: CS-TR-v2.0
          ID:: STAN//CSL-TR-95-667
       ENTRY:: June 05, 1995
ORGANIZATION:: Stanford University, Computer Systems Laboratory
       TITLE:: Better Optical Triangulation through Spacetime Analysis
        TYPE:: Technical Report
      AUTHOR:: Curless, Brian
      AUTHOR:: Levoy, Marc
        DATE:: April 1995
       PAGES:: 12
    ABSTRACT:: The standard methods for extracting range data from optical
               triangulation scanners are accurate only for planar objects
               of uniform reflectance illuminated by an incoherent source.
               Using these methods, curved surfaces, discontinuous surfaces,
               and surfaces of varying reflectance cause systematic
               distortions of the range data. Coherent light sources such as
               lasers introduce speckle artifacts that further degrade the
               data. We present a new ranging method based on analyzing the
               time evolution of the structured light reflections. Using our
               spacetime analysis, we can correct for each of these
               artifacts, thereby attaining significantly higher accuracy
               using existing technology. We present results that
               demonstrate the validity of our method using a commercial
               laser stripe triangulation scanner.
       NOTES:: [Adminitrivia V1/Prg/19950605]
         END:: STAN//CSL-TR-95-667