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292     Appendix A. CD Datasets


                          A.2 Clusters

                          The Clusters.xls file contains four sets with two-dimensional (A, B) sets of  points
                          with different cluster shape:

                             "Glob" :    globular clusters data
                             "Filam" :   filamentary clusters data
                             "+Crossw:   + shaped Cross data
                             "xCross" :   x shaped Cross data

                           Author: JP Marques de Si, Engineering Faculty, Oporto University.


                           A.3  Cork Stoppers


                          The Cork Stoppers.xls file contains measurements performed automatically by  an
                           image  processing  system on  150 cork  stoppers belonging  to  three classes.  Each
                           image was digitised with  an adequate threshold in order to enhance the defects as
                           shown in Figure A.1.














                           Figure  A.1.  Example of  a cork  stopper image at the left and  the  corresponding
                           binary image of the defects at the right.



                             The first column of the Cork Stoppers.xls spreadsheet contains the class labels
                           assigned by human experts:
                             wl  - Quality Super        (nl=50 cork stoppers)
                             @  - Quality Normal        (n2=50 cork stoppers)
                             cy  - Quality Poor         (n3=50 cork stoppers)

                             The following columns contain the measurements performed automatically:

                             N    :      Total number of defects
                             PRT  :      Total perimeter of the defects (in pixels)
                             ART  :      Total area of the defects (in pixels)
   298   299   300   301   302   303   304   305   306   307   308