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@InProceedings{JourdanAlca:1994:PrCoIm,
               author = "Jourdan, Marcelo Mollica and Alcaim, Abraham",
          affiliation = "{Centro Cient{\'{\i}}fico Rio da IBM Brasil} and {Centro de 
                         Estudos em Telecomunica{\c{c}}{\~o}es (CETUC) da 
                         Pontif{\'{\i}}cia Universidade Cat{\'o}lica do Ri o de Janeiro 
                         (PUC-Rio)}",
                title = "Pr{\'e}-processamento em codifica{\c{c}}{\~a}o de imagens por 
                         sub-bandas para redu{\c{c}}{\~a}o de irrelev{\^a}ncia visual",
            booktitle = "Anais...",
                 year = "1994",
               editor = "Freitas, Carla dal Sasso and Geus, Klaus de and Scheer, 
                         S{\'e}rgio",
                pages = "23--29",
         organization = "Simp{\'o}sio Brasileiro de Computa{\c{c}}{\~a}o Gr{\'a}fica e 
                         Processamento de Imagens, 7. (SIBGRAPI)",
            publisher = "Sociedade Brasileira de Computa{\c{c}}{\~a}o",
              address = "Porto Alegre",
             keywords = "irrelev{\^a}ncia visual, codifica{\c{c}}{\~a}o de imagens, 
                         pr{\'e}-processamento de imagens, codificadores de imagens, 
                         imagens por sub-bandas.",
             abstract = "In low bit-rate coding of images, it has been show that 
                         compression ratio can be greatly improved by eliminating 
                         information irrelevant to the human eye. In this paper we describe 
                         a technique for accomplishing this task. The image spectrum is 
                         decomposed in 10 sub-bands and, for each band; blocks of pixels 
                         are discarded if they do not satisfy thresholds of average energy. 
                         The benefits of this technique are reduction of pixels to be coded 
                         (typically to 15-50% of the original), low computational 
                         complexity and very little side information generated.",
  conference-location = "Curitiba",
      conference-year = "9 - 11 nov. 1994",
                 isbn = "978-85-7669-272-0",
             language = "pt",
                  ibi = "8JMKD3MGPBW34M/3DD7AEE",
                  url = "http://urlib.net/ibi/8JMKD3MGPBW34M/3DD7AEE",
           targetfile = "4 Pre processamento em codifica{\c{c}}{\~a}o de imagens por sub 
                         bandas.pdf",
                 type = "Processamento de Imagens I",
               volume = "1",
        urlaccessdate = "2021, Nov. 29"
}


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