author = "Prauchner, Jo{\~a}o Luis and Freitas, Carla M. Dal Sasso and 
                         Comba, Jo{\~a}o L. Dihl",
          affiliation = "{Instituto de Inform{\'a}tica} and {Universidade Federal do Rio 
                         Grande do Sul}",
                title = "Two-level interaction approach for transfer function 
            booktitle = "Proceedings...",
                 year = "2005",
               editor = "Rodrigues, Maria Andr{\'e}ia Formico and Frery, Alejandro 
         organization = "Brazilian Symposium on Computer Graphics and Image Processing, 18. 
            publisher = "IEEE Computer Society",
              address = "Los Alamitos",
             keywords = "transfer function, volumetric visualization.",
             abstract = "Direct volume rendering techniques are used to visualize and 
                         explore large scalar volumes. Transfer functions (TFs) that assign 
                         opacity and color to scalar values are very important to display 
                         volume features, but their specification is not trivial or 
                         intuitive. This work presents an interactive, semi-automatic tool 
                         to assist the user in the generation of opacity and color TFs. We 
                         use the histogram approach proposed by Kindlmann and Durkin [9] to 
                         reduce the scope of candidate TFs presented to the user following 
                         the Design Galleries method [18]. The combination of these two 
                         solutions leads to a single interactive tool that allows the user 
                         to deal with different aspects of TF specification.",
  conference-location = "Natal",
      conference-year = "9-12 Oct. 2005",
             language = "en",
           targetfile = "prauchnerjl_transfer_function_final_version.pdf",
        urlaccessdate = "2020, Dec. 03"