-
-//----------------------------------------------------------------------//
-// USER SYMBOLS //
-//----------------------------------------------------------------------//
-
-// Filter types
-static const char O_FILTER_ABS_BANDLIMIT_STR[]= "abs_bandlimit";
-static const char O_FILTER_ABS_SINC_STR[]= "abs_sinc";
-static const char O_FILTER_ABS_COS_STR[]= "abs_cos";
-static const char O_FILTER_ABS_HAMMING_STR[]= "abs_hamming";
-static const char O_FILTER_SHEPP_STR[]= "shepp";
-static const char O_FILTER_BANDLIMIT_STR[]= "bandlimit";
-static const char O_FILTER_SINC_STR[]= "sinc";
-static const char O_FILTER_COS_STR[]= "cos";
-static const char O_FILTER_HAMMING_STR[]= "hamming";
-static const char O_FILTER_TRIANGLE_STR[]= "triangle";
-
-typedef enum {
- FILTER_BANDLIMIT,
- FILTER_SINC,
- FILTER_G_HAMMING,
- FILTER_COSINE,
- FILTER_TRIANGLE,
- FILTER_ABS_BANDLIMIT, // filter times |x|
- FILTER_ABS_SINC,
- FILTER_ABS_G_HAMMING,
- FILTER_ABS_COSINE,
- FILTER_SHEPP
-} FilterType;
-
-
-// Function domains
-static const char D_FREQ_STR[]= "freq";
-static const char D_SPATIAL_STR[]= "spatial";
-
-typedef enum {
- D_FREQ = 1,
- D_SPATIAL
-} DomainType;
-
-
-/* interpolation methods */
-static const char O_INTERP_NEAREST_STR[]= "nearest";
-static const char O_INTERP_LINEAR_STR[]= "linear";
-static const char O_INTERP_BSPLINE_STR[]= "bspline";
-
-#undef HAVE_BSPLINE_INTERP
-typedef enum { // Interpolation methods
- I_NEAREST = 1, // Nearest neighbor
-#if HAVE_BSPLINE_INTERP
- I_BSPLINE,
- I_1BSPLINE, // 1st order B-Spline
- I_2BSPLINE,
- I_3BSPLINE,
-#endif
- I_LINEAR // Linear interpolation
-} InterpolationType;
-
-
-// Trace levels
-static const char O_TRACE_NONE_STR[]= "none";
-static const char O_TRACE_TEXT_STR[]= "text";
-static const char O_TRACE_PHM_STR[]= "phm";
-static const char O_TRACE_RAYS_STR[]= "rays";
-static const char O_TRACE_PLOT_STR[]= "plot";
-static const char O_TRACE_CLIPPING_STR[]= "clipping";
-
-enum {
- TRACE_NONE, /* No tracing */
- TRACE_TEXT, /* Minimal status */
- TRACE_PHM, /* Show phantom */
- TRACE_RAYS, /* Show all rays */
- TRACE_PLOT, /* Plot raysums */
- TRACE_CLIPPING /* Plot clipping */
-};
-
-// Standard phantomsa
-static const char O_PHM_HERMAN_STR[]= "herman";
-static const char O_PHM_ROWLAND_STR[]= "rowland";
-static const char O_PHM_BROWLAND_STR[]= "browland";
-static const char O_PHM_UNITPULSE_STR[]= "unitpulse";
-typedef enum {
- O_PHM_HERMAN, /* Herman head phantom */
- O_PHM_ROWLAND, /* Rowland head phantom */
- O_PHM_BROWLAND, /* Bordered Rowland head phantom */
- O_PHM_UNITPULSE /* Unit pulse phantom */
-} PhantomType;
-
-// Backproject types
-static const char O_BPROJ_TRIG_STR[]= "trig";
-static const char O_BPROJ_TABLE_STR[]= "table";
-static const char O_BPROJ_DIFF_STR[]= "diff";
-static const char O_BPROJ_DIFF2_STR[]= "diff2";
-static const char O_BPROJ_IDIFF2_STR[]= "idiff2";
-
-typedef enum {
- O_BPROJ_TRIG,
- O_BPROJ_TABLE,
- O_BPROJ_DIFF,
- O_BPROJ_DIFF2,
- O_BPROJ_IDIFF2
-} BackprojType;
-
-// Convolution symmetries
-typedef enum {
- FUNC_EVEN = 1, // function types, f[-n] = f[n]
- FUNC_ODD, // f[-n] = -f[n]
- FUNC_BOTH // function has both odd & even components
-} FunctionSymmetry;
-
-
-