@InProceedings{SaracchiniStolLeit:2008:MaPhOb,
               author = "Saracchini, Rafael Felipe Veiga and Stolfi, Jorge and Leit{\~a}o, 
                         Helena Cristina da Gama",
          affiliation = "IC-Unicamp and IC-Unicamp and IC-UFF",
                title = "Matching Photometric Observation Vectors with Shadows and Variable 
                         Albedo",
            booktitle = "Proceedings...",
                 year = "2008",
               editor = "Jung, Cl{\'a}udio Rosito and Walter, Marcelo",
         organization = "Brazilian Symposium on Computer Graphics and Image Processing, 21. 
                         (SIBGRAPI)",
            publisher = "IEEE Computer Society",
              address = "Los Alamitos",
             keywords = "variable lighting photometric stereo, shadows and highlight 
                         detection, signature-matching.",
             abstract = "We describe a procedure to solve the basic problem of Variable 
                         Lighting Photometric Stereo -- namely, recovering the normal 
                         directions and intrinsic albedos at all visible points of an 
                         opaque object, by analyzing three or more photos of the same taken 
                         with different illuminations. We follow the gauge-based approach, 
                         where the lighting conditions and light scattering properties of 
                         the surface are given indirectly by photographing a gauge object 
                         with known shape and albedo, under the same lighting conditions. 
                         Unlike previous solutions, our method yields reliable results even 
                         when some of the images contain cast shadows, penumbras, 
                         highlights, or inter-object lighting, at a cost. The cost of inner 
                         loop grows quadratically, (rather than exponentially) with the 
                         number m of input images. Usable approximations can be obtained in 
                         m log m time.",
  conference-location = "Campo Grande, MS, Brazil",
      conference-year = "12-15 Oct. 2008",
                  doi = "10.1109/SIBGRAPI.2008.39",
                  url = "http://dx.doi.org/10.1109/SIBGRAPI.2008.39",
             language = "en",
                  ibi = "6qtX3pFwXQZG2LgkFdY/V79mf",
                  url = "http://urlib.net/ibi/6qtX3pFwXQZG2LgkFdY/V79mf",
           targetfile = "stolfij-MatchingPhotometric.pdf",
        urlaccessdate = "2024, May 02"
}