dwt

dwt — Discrete Wavelet Transform

Functions

Types and Values

Includes

#include <libprocess/gwyprocess.h>

Description

Functions

gwy_dwt_type_get_enum()

const GwyEnum *
gwy_dwt_type_get_enum (void);

Returns GwyEnum for GwyDWTType enum type.

Returns

NULL-terminated GwyEnum which must not be modified nor freed.


gwy_dwt_denoise_type_get_enum()

const GwyEnum *
gwy_dwt_denoise_type_get_enum (void);

Returns GwyEnum for GwyDWTDenoiseType enum type.

Returns

NULL-terminated GwyEnum which must not be modified nor freed.


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

enum GwyDWTType

Members

GWY_DWT_HAAR

   

GWY_DWT_DAUB4

   

GWY_DWT_DAUB6

   

GWY_DWT_DAUB8

   

GWY_DWT_DAUB12

   

GWY_DWT_DAUB20

   

enum GwyDWTDenoiseType

Members

GWY_DWT_DENOISE_UNIVERSAL

   

GWY_DWT_DENOISE_SCALE_ADAPTIVE

   

GWY_DWT_DENOISE_SPACE_ADAPTIVE