00001 #ifndef vil3d_make_distance_filter_h_ 00002 #define vil3d_make_distance_filter_h_ 00003 //: 00004 // \file 00005 // \brief Compute filter for a distance transform. 00006 // \author Tim Cootes 00007 00008 #include <vil3d/algo/vil3d_structuring_element.h> 00009 00010 //: Create filter such that d[a] is distance from origin of se[a] 00011 // Pixel widths are (width_i,width_j,width_k). Elements are 00012 // selected so that only voxels visited before in a raster scan 00013 // of the image are included. Distance transforms require two 00014 // passes, a forward and reverse pass. 00015 // 00016 // Consider only voxels within 1 voxel (1 norm) of origin. 00017 // Indexes (27-1)/2 = 13 voxels. 00018 void vil3d_make_distance_filter_r1( 00019 double width_i, 00020 double width_j, 00021 double width_k, 00022 vil3d_structuring_element& se, 00023 vcl_vector<double>& d); 00024 00025 //: Create filter such that d[a] is distance from origin of se[a] 00026 // Pixel widths are (width_i,width_j,width_k). Elements are 00027 // selected so that only voxels visited before in a raster scan 00028 // of the image are included. Distance transforms require two 00029 // passes, a forward and reverse pass. 00030 // 00031 // Consider only voxels within r voxels (1 norm) of origin. 00032 void vil3d_make_distance_filter( 00033 double width_i, 00034 double width_j, 00035 double width_k, 00036 int r, 00037 vil3d_structuring_element& se, 00038 vcl_vector<double>& d); 00039 00040 #endif // vil3d_make_distance_filter_h_
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