fourier_1dim

Herror ::fourier_1dim_inv ( const HTuple &RealCoef, const HTuple &ImaginaryCoef, const HTuple &MaxCoef, HTuple *Rows, HTuple *Columns )

One dimensional Fourier synthesis (inverse Fourier transform).

Backtransformation of Fourier coefficients respectively of Fourier descriptors. The number of values to be backtransformed should not exceed the length of the transformed contour.

Parameters

`RealCoef` (input_control)	real-array `->` HTuple.double
Real parts.

`ImaginaryCoef` (input_control)	real-array `->` HTuple.double
Imaginary parts.

`MaxCoef` (input_control)	integer `->` HTuple.long
Input of the steps for the backtransformation.
Default value: 100
Suggested values: 5, 10, 15, 20, 30, 40, 50, 60, 70, 80, 90, 100, 150, 200, 400
Restriction: `MaxCoef >= 1`

`Rows` (output_control)	contour.y-array `->` HTuple.double *
Row coordinates.

`Columns` (output_control)	contour.x-array `->` HTuple.double *
Column coordinates.

Example

get_region_contour(single,&row,&col);
length_of_contour = row.Num();
move_contour_orig(row,col,&trow,&tcol); 
prep_contour_fourier(trow,tcol,"unsigned_area",&param_scale);
fourier_1dim(trow,tcol,param_scale,50,&frow,&fcol);
invar_fourier_coeff(frow,fcol,1,"affine_invar",&invrow,&invcol);
abs_invar_fourier_coeff(invrow,invcol,1,2,"az_invar1",&absrow,&abscol);
fourier_1dim_inv(absrow,abscol,length_of_contour,&fsynrow,&fsyncol);

Possible Predecessors

::invar_fourier_coeff, ::fourier_1dim

Possible Successors

::disp_polygon

Module

Fourier descriptors