author = "Torre{\~a}o, Jos{\'e} R. A. and Mattos, Germana M.",
          affiliation = "{Departamento de Inform{\'a}tica da Universidade Federal de 
                         Pernambuco (UFPE)} and {Departamento de Inform{\'a}tica da 
                         Universidade Federal de Pernambuco (UFPE)}",
                title = "An Optical Flow Approach to Photometric Stereo",
            booktitle = "Anais...",
                 year = "1995",
               editor = "Lotufo, Roberto de Alencar and Mascarenhas, Nelson Delfino 
                pages = "213--218",
         organization = "Simp{\'o}sio Brasileiro de Computa{\c{c}}{\~a}o Gr{\'a}fica e 
                         Processamento de Imagens, 8. (SIBGRAPI)",
            publisher = "Sociedade Brasileira de Computa{\c{c}}{\~a}o",
              address = "Porto Alegre",
             keywords = "optical Flow, photometric stereo.",
             abstract = "We introduce a new approach to photometric stereo (PS) in which 
                         the optical flow resulting from the change of illumination of the 
                         image surface is estimated and used for depth reconstruction 
                         through a structure from-motion scheme. The optical flow of the PS 
                         images is determined via a gradient-based algorithm, while a 
                         least-squares strategy is used for the structure-from-motion 
                         reconstruction, assuming that the irradiance pattern over the 
                         imaged surface undergoes a purely rotational rigid-body motion, 
                         when the illumination direction is changed. Our approach to PS has 
                         been successfully applied in the estimation of shape from both 
                         synthetic and real images of lambertian surfaces.",
  conference-location = "S{\~a}o Carlos",
      conference-year = "25 - 27 out. 1995",
                 isbn = "978-85-7669-273-7",
             language = "en",
                  ibi = "8JMKD3MGPBW34M/3DJCFKE",
                  url = "",
           targetfile = "27 An optical flow approach.pdf",
                 type = "Vis{\~a}o por Computador",
        urlaccessdate = "2020, Nov. 28"