dwt

dwt — Discrete Wavelet Transform

Synopsis


#include <libprocess/gwyprocess.h>

GwyDataLine*        gwy_dwt_set_coefficients            (GwyDataLine *dline,
                                                         GwyDWTType type);
void                gwy_data_line_dwt                   (GwyDataLine *dline,
                                                         GwyDataLine *wt_coefs,
                                                         GwyTransformDirection direction,
                                                         gint minsize);
void                gwy_data_field_xdwt                 (GwyDataField *dfield,
                                                         GwyDataLine *wt_coefs,
                                                         GwyTransformDirection direction,
                                                         gint minsize);
void                gwy_data_field_ydwt                 (GwyDataField *dfield,
                                                         GwyDataLine *wt_coefs,
                                                         GwyTransformDirection direction,
                                                         gint minsize);
void                gwy_data_field_dwt                  (GwyDataField *dfield,
                                                         GwyDataLine *wt_coefs,
                                                         GwyTransformDirection direction,
                                                         gint minsize);
void                gwy_data_field_dwt_mark_anisotropy  (GwyDataField *dfield,
                                                         GwyDataField *mask,
                                                         GwyDataLine *wt_coefs,
                                                         gdouble ratio,
                                                         gint lowlimit);

Description

Details

gwy_dwt_set_coefficients ()

GwyDataLine*        gwy_dwt_set_coefficients            (GwyDataLine *dline,
                                                         GwyDWTType type);

Fills resampled or nely allocated data line with wavelet coefficients.

`dline` :	Data line to store wavelet coefficients to (or `NULL` to allocate a new one).
`type` :	Wavelet type.
Returns :	resampled or newly allocated GwyDataLine with wavelet coefficients.

gwy_data_line_dwt ()

void                gwy_data_line_dwt                   (GwyDataLine *dline,
                                                         GwyDataLine *wt_coefs,
                                                         GwyTransformDirection direction,
                                                         gint minsize);

Performs steps of the wavelet decomposition.

The smallest low pass coefficients block is equal to minsize. Run with minsize = dline->res/2 to perform one step of decomposition or minsize = 4 to perform full decomposition (or anything between).

`dline` :	Data line to be transformed, it must have at least four samples.
`wt_coefs` :	Data line where the wavelet transform coefficients are stored.
`direction` :	Transform direction.
`minsize` :	size of minimal transform result block

gwy_data_field_xdwt ()

void                gwy_data_field_xdwt                 (GwyDataField *dfield,
                                                         GwyDataLine *wt_coefs,
                                                         GwyTransformDirection direction,
                                                         gint minsize);

Performs steps of the X-direction image wavelet decomposition.

The smallest low pass coefficients block is equal to minsize. Run with minsize = dfield->xres/2 to perform one step of decomposition or minsize = 4 to perform full decomposition (or anything between).

`dfield` :	Data field to be transformed.
`wt_coefs` :	Data line where the wavelet transform coefficients are stored.
`direction` :	Transform direction.
`minsize` :	size of minimal transform result block

gwy_data_field_ydwt ()

void                gwy_data_field_ydwt                 (GwyDataField *dfield,
                                                         GwyDataLine *wt_coefs,
                                                         GwyTransformDirection direction,
                                                         gint minsize);

Performs steps of the Y-direction image wavelet decomposition.

The smallest low pass coefficients block is equal to minsize. Run with minsize = dfield->yres/2 to perform one step of decomposition or minsize = 4 to perform full decomposition (or anything between).

`dfield` :	Data field to be transformed.
`wt_coefs` :	Data line where the wavelet transform coefficients are stored.
`direction` :	Transform direction.
`minsize` :	size of minimal transform result block

gwy_data_field_dwt ()

void                gwy_data_field_dwt                  (GwyDataField *dfield,
                                                         GwyDataLine *wt_coefs,
                                                         GwyTransformDirection direction,
                                                         gint minsize);

Performs steps of the 2D image wavelet decomposition.

`dfield` :	Data field to be transformed (must be square).
`wt_coefs` :	Data line where the wavelet transform coefficients are stored.
`direction` :	Transform direction.
`minsize` :	size of minimal transform result block

gwy_data_field_dwt_mark_anisotropy ()

void                gwy_data_field_dwt_mark_anisotropy  (GwyDataField *dfield,
                                                         GwyDataField *mask,
                                                         GwyDataLine *wt_coefs,
                                                         gdouble ratio,
                                                         gint lowlimit);

`dfield` :
`mask` :
`wt_coefs` :
`ratio` :
`lowlimit` :

			Gwyddion Data Processing Library Reference Manual
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