prep_contour

Herror ::prep_contour_fourier ( const HTuple &Rows, const HTuple &Columns, const HTuple &TransMode, HTuple *ParContour )

Parameterize the passed contour.

The operator ::prep_contour_fourier parameterizes the transmitted contour in order to prepare it for the one dimensional Fourier transformation. Hereby the contour must be available in closed form. Three parameter functions are available for the control parameter TransMode: arc: Parameterization by the radian. signed_area: Parameterization by the signed area. unsigned_area: Parameterization by the absolute area. Please note that in contrast to the signed or unsigned area the affine mapping of the radian will not be transformed linearly.

Parameters

`Rows` (input_control)	contour.y-array `->` HTuple.long
Row indices of the contour.

`Columns` (input_control)	contour.x-array `->` HTuple.long
Column indices of the contour.

`TransMode` (input_control)	string `->` HTuple.char *
Kind of parameterization.
Default value: 'signed_area'
Suggested values: 'arc', 'unsigned_area', 'signed_area'

`ParContour` (output_control)	real-array `->` HTuple.double *
Parameterized contour.

Example

get_region_contour(single,&row,&col);
move_contour_orig(row,col,&trow,&tcol);
prep_contour_fourier(trow,tcol,"unsigned_area",&param_scale);
fourier_1dim(trow,tcol,param_scale,&frow,&fcol);

Possible Predecessors

::move_contour_orig

Possible Successors

::fourier_1dim

Module

Fourier descriptors