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 6596 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 6620 of file processor.h.

06621                 {
06622                         return "Computes the DWT (discrete wavelet transform) of an image in one of 3 possible bases";
06623                 }

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 6601 of file processor.h.

References NAME.

Referenced by process_inplace().

06602                 {
06603                         return NAME;
06604                 }

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 6611 of file processor.h.

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

06612                 {
06613                         TypeDict d;
06614                         d.put("type", EMObject::STRING, "'daub', 'harr' or 'bspl'");
06615                         d.put("dir", EMObject::INT, "1 for forward transform, -1 for inverse transform");
06616                         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)");
06617                         return d;
06618                 }

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

Definition at line 6606 of file processor.h.

06607                 {
06608                         return new WaveletProcessor();
06609                 }

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 7931 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().

07932 {
07933         if (image->get_zsize() != 1) {
07934                         LOGERR("%s Processor doesn't support 3D", get_name().c_str());
07935                         throw ImageDimensionException("3D model not supported");
07936         }
07937 
07938         int i,nx,ny;
07939         const gsl_wavelet_type * T;
07940         nx=image->get_xsize();
07941         ny=image->get_ysize();
07942 
07943         if (nx != ny && ny!=1) throw ImageDimensionException("Wavelet transform only supports square images");
07944 //      float l=log((float)nx)/log(2.0f);
07945 //      if (l!=floor(l)) throw ImageDimensionException("Wavelet transform size must be power of 2");
07946         if( !Util::IsPower2(nx) )  throw ImageDimensionException("Wavelet transform size must be power of 2");
07947 
07948         // Unfortunately GSL works only on double() arrays
07949         // eventually we should put our own wavelet code in here
07950         // but this will work for now
07951         double *cpy = (double *)malloc(nx*ny*sizeof(double));
07952 
07953         for (i=0; i<nx*ny; i++) cpy[i]=image->get_value_at(i,0,0);
07954 
07955         string tp = (const char*)params["type"];
07956         if (tp=="daub") T=gsl_wavelet_daubechies;
07957         else if (tp=="harr") T=gsl_wavelet_haar;
07958         else if (tp=="bspl") T=gsl_wavelet_bspline;
07959         else throw InvalidStringException(tp,"Invalid wavelet name, 'daub', 'harr' or 'bspl'");
07960 
07961         int K=(int)params["ord"];
07962         gsl_wavelet_direction dir;
07963         if ((int)params["dir"]==1) dir=forward;
07964         else dir=backward;
07965 
07966         gsl_wavelet *w = gsl_wavelet_alloc(T, K);
07967         gsl_wavelet_workspace *work = gsl_wavelet_workspace_alloc(nx);
07968 
07969         if (ny==1) gsl_wavelet_transform (w,cpy, 1, nx, dir, work);
07970         else gsl_wavelet2d_transform (w, cpy, nx,nx,ny, dir, work);
07971 
07972         gsl_wavelet_workspace_free (work);
07973         gsl_wavelet_free (w);
07974 
07975         for (i=0; i<nx*ny; i++) image->set_value_at_fast(i,0,0,static_cast<float>(cpy[i]));
07976 
07977         free(cpy);
07978 }


Member Data Documentation

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

Definition at line 6625 of file processor.h.

Referenced by get_name().


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