EMAN::WaveletProcessor Class Reference

Perform a Wavelet transform using GSL. More...

#include <processor.h>

Inheritance diagram for EMAN::WaveletProcessor:

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Collaboration diagram for EMAN::WaveletProcessor:

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List of all members.

Public Member Functions

virtual void process_inplace (EMData *image)
 To process an image in-place.
virtual string get_name () const
 Get the processor's name.
virtual TypeDict get_param_types () const
 Get processor parameter information in a dictionary.
virtual string get_desc () const
 Get the descrition of this specific processor.

Static Public Member Functions

static ProcessorNEW ()

Static Public Attributes

static const string NAME = "basis.wavelet"

Detailed Description

Perform a Wavelet transform using GSL.

Author:
Steve Ludtke <sludtke@bcm.edu>
Date:
10/15/2006
Parameters:
type "daub", "harr", or "bspl"
dir 1 for forward transform, -1 for inverse transform
ord for Daubechies (4,6,8,...,20), for Harr (2), for B-Splines (103, 105, 202, 204, 206, 208, 301, 303, 305 307, 309)

Definition at line 6636 of file processor.h.


Member Function Documentation

virtual string EMAN::WaveletProcessor::get_desc (  )  const [inline, virtual]

Get the descrition of this specific processor.

This function must be overwritten by a subclass.

Returns:
The description of this processor.

Implements EMAN::Processor.

Definition at line 6660 of file processor.h.

06661                 {
06662                         return "Computes the DWT (discrete wavelet transform) of an image in one of 3 possible bases";
06663                 }

virtual string EMAN::WaveletProcessor::get_name (  )  const [inline, virtual]

Get the processor's name.

Each processor is identified by a unique name.

Returns:
The processor's name.

Implements EMAN::Processor.

Definition at line 6641 of file processor.h.

References NAME.

Referenced by process_inplace().

06642                 {
06643                         return NAME;
06644                 }

virtual TypeDict EMAN::WaveletProcessor::get_param_types (  )  const [inline, virtual]

Get processor parameter information in a dictionary.

Each parameter has one record in the dictionary. Each record contains its name, data-type, and description.

Returns:
A dictionary containing the parameter info.

Reimplemented from EMAN::Processor.

Definition at line 6651 of file processor.h.

References EMAN::EMObject::INT, EMAN::TypeDict::put(), and EMAN::EMObject::STRING.

06652                 {
06653                         TypeDict d;
06654                         d.put("type", EMObject::STRING, "'daub', 'harr' or 'bspl'");
06655                         d.put("dir", EMObject::INT, "1 for forward transform, -1 for inverse transform");
06656                         d.put("ord", EMObject::INT, "Daubechies (4,6,8,...,20), for Harr (2), for B-Splines (103, 105, 202, 204, 206, 208, 301, 303, 305 307, 309)");
06657                         return d;
06658                 }

static Processor* EMAN::WaveletProcessor::NEW (  )  [inline, static]

Definition at line 6646 of file processor.h.

06647                 {
06648                         return new WaveletProcessor();
06649                 }

void WaveletProcessor::process_inplace ( EMData image  )  [virtual]

To process an image in-place.

For those processors which can only be processed out-of-place, override this function to just print out some error message to remind user call the out-of-place version.

Parameters:
image The image to be processed.

Implements EMAN::Processor.

Definition at line 8038 of file processor.cpp.

References get_name(), EMAN::EMData::get_value_at(), EMAN::EMData::get_xsize(), EMAN::EMData::get_ysize(), EMAN::EMData::get_zsize(), ImageDimensionException, InvalidStringException, EMAN::Util::IsPower2(), LOGERR, EMAN::Processor::params, and EMAN::EMData::set_value_at_fast().

08039 {
08040         if (image->get_zsize() != 1) {
08041                         LOGERR("%s Processor doesn't support 3D", get_name().c_str());
08042                         throw ImageDimensionException("3D model not supported");
08043         }
08044 
08045         int i,nx,ny;
08046         const gsl_wavelet_type * T;
08047         nx=image->get_xsize();
08048         ny=image->get_ysize();
08049 
08050         if (nx != ny && ny!=1) throw ImageDimensionException("Wavelet transform only supports square images");
08051 //      float l=log((float)nx)/log(2.0f);
08052 //      if (l!=floor(l)) throw ImageDimensionException("Wavelet transform size must be power of 2");
08053         if( !Util::IsPower2(nx) )  throw ImageDimensionException("Wavelet transform size must be power of 2");
08054 
08055         // Unfortunately GSL works only on double() arrays
08056         // eventually we should put our own wavelet code in here
08057         // but this will work for now
08058         double *cpy = (double *)malloc(nx*ny*sizeof(double));
08059 
08060         for (i=0; i<nx*ny; i++) cpy[i]=image->get_value_at(i,0,0);
08061 
08062         string tp = (const char*)params["type"];
08063         if (tp=="daub") T=gsl_wavelet_daubechies;
08064         else if (tp=="harr") T=gsl_wavelet_haar;
08065         else if (tp=="bspl") T=gsl_wavelet_bspline;
08066         else throw InvalidStringException(tp,"Invalid wavelet name, 'daub', 'harr' or 'bspl'");
08067 
08068         int K=(int)params["ord"];
08069         gsl_wavelet_direction dir;
08070         if ((int)params["dir"]==1) dir=forward;
08071         else dir=backward;
08072 
08073         gsl_wavelet *w = gsl_wavelet_alloc(T, K);
08074         gsl_wavelet_workspace *work = gsl_wavelet_workspace_alloc(nx);
08075 
08076         if (ny==1) gsl_wavelet_transform (w,cpy, 1, nx, dir, work);
08077         else gsl_wavelet2d_transform (w, cpy, nx,nx,ny, dir, work);
08078 
08079         gsl_wavelet_workspace_free (work);
08080         gsl_wavelet_free (w);
08081 
08082         for (i=0; i<nx*ny; i++) image->set_value_at_fast(i,0,0,static_cast<float>(cpy[i]));
08083 
08084         free(cpy);
08085 }


Member Data Documentation

const string WaveletProcessor::NAME = "basis.wavelet" [static]

Definition at line 6665 of file processor.h.

Referenced by get_name().


The documentation for this class was generated from the following files:
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