Gwyddion – Free SPM (AFM, SNOM/NSOM, STM, MFM, …) data analysis software

dwt

dwt — Discrete Wavelet Transform

Functions

GwyDataLine * gwy_dwt_set_coefficients ()
void gwy_data_line_dwt ()
void gwy_data_field_xdwt ()
void gwy_data_field_ydwt ()
void gwy_data_field_dwt ()
void gwy_data_field_dwt_mark_anisotropy ()

Includes

#include <libprocess/gwyprocess.h>

Description

Functions

gwy_dwt_set_coefficients ()

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

Fills resampled or nely allocated data line with wavelet coefficients.

Parameters

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).

Parameters

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).

Parameters

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).

Parameters

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.

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).

Parameters

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);

Performs steps of the 2D 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).

Parameters

dfield

Data field to mark anisotropy of (must be square).

 

wt_coefs

Data line to store wavelet transform coefficients to.

 

minsize

size of minimal transform result block

 

Types and Values

© David Nečas and Petr Klapetek

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