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EMAN::XGradientProcessor Class Reference

Determines the partial derivatives in the x direction Does this by constructing edge kernels in real space but convoluting in Fourier space. More...

#include <processor.h>

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List of all members.

Public Member Functions

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

Static Public Member Functions

static ProcessorNEW ()

Static Public Attributes

static const string NAME = "math.edge.xgradient"

Detailed Description

Determines the partial derivatives in the x direction Does this by constructing edge kernels in real space but convoluting in Fourier space.

Author:
David Woolford
Date:
2007/12/04

Definition at line 529 of file processor.h.


Constructor & Destructor Documentation

EMAN::XGradientProcessor::XGradientProcessor  )  [inline]
 

Definition at line 532 of file processor.h.

Referenced by NEW().

00532 {}


Member Function Documentation

string EMAN::XGradientProcessor::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 546 of file processor.h.

00547                 {
00548                         return "Determines the image gradient in the x direction";
00549                 }

string EMAN::XGradientProcessor::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 534 of file processor.h.

References NAME.

00535                 {
00536                         return NAME;
00537                 }

TypeDict EMAN::XGradientProcessor::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 551 of file processor.h.

00552                 {
00553                         TypeDict d;
00554                         return d;
00555                 }

static Processor* EMAN::XGradientProcessor::NEW  )  [inline, static]
 

Definition at line 541 of file processor.h.

References XGradientProcessor().

00542                 {
00543                         return new XGradientProcessor();
00544                 }

void XGradientProcessor::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 9135 of file processor.cpp.

References EMAN::EMData::clip_inplace(), EMAN::EMData::get_xsize(), EMAN::EMData::get_ysize(), EMAN::EMData::get_zsize(), ImageDimensionException, ImageFormatException, EMAN::EMData::is_complex(), EMAN::EMData::process_inplace(), EMAN::EMData::set_size(), and EMAN::EMData::set_value_at().

09136 {
09137         if (image->is_complex()) throw ImageFormatException("Cannot edge detect a complex image");
09138 
09139         EMData* e = new EMData();
09140         int nx = image->get_xsize();
09141         int ny = image->get_ysize();
09142         int nz = image->get_zsize();
09143 
09144         if ( nz == 1 && ny == 1 ) {
09145                 if ( nx < 3 ) throw ImageDimensionException("Error - cannot edge detect an image with less than three pixels");
09146 
09147                 e->set_size(3,1,1);
09148                 e->set_value_at(0,-1);
09149                 e->set_value_at(2, 1);
09150 
09151                 Region r = Region(-nx/2+1,nx);
09152                 e->clip_inplace(r);
09153         } else if ( nz == 1 ) {
09154                 if ( nx < 3 || ny < 3 ) throw ImageDimensionException("Error - cannot edge detect an image with less than three pixels");
09155                 e->set_size(3,3,1);
09156                 e->set_value_at(0,0,-1);
09157                 e->set_value_at(0,1,-2);
09158                 e->set_value_at(0,2,-1);
09159 
09160                 e->set_value_at(2,0,1);
09161                 e->set_value_at(2,1,2);
09162                 e->set_value_at(2,2,1);
09163                 Region r = Region(-nx/2+1,-ny/2+1,nx,ny);
09164                 e->clip_inplace(r);
09165         } else {
09166                 if ( nx < 3 || ny < 3 || nz < 3) throw ImageDimensionException("Error - cannot edge detect an image with less than three pixels");
09167                 e->set_size(3,3,3);
09168                 e->set_value_at(0,0,0,-1);
09169                 e->set_value_at(0,1,0,-1);
09170                 e->set_value_at(0,2,0,-1);
09171                 e->set_value_at(0,0,1,-1);
09172                 e->set_value_at(0,1,1,-8);
09173                 e->set_value_at(0,2,1,-1);
09174                 e->set_value_at(0,0,2,-1);
09175                 e->set_value_at(0,1,2,-1);
09176                 e->set_value_at(0,2,2,-1);
09177 
09178                 e->set_value_at(2,0,0,1);
09179                 e->set_value_at(2,1,0,1);
09180                 e->set_value_at(2,2,0,1);
09181                 e->set_value_at(2,0,1,1);
09182                 e->set_value_at(2,1,1,8);
09183                 e->set_value_at(2,2,1,1);
09184                 e->set_value_at(2,0,2,1);
09185                 e->set_value_at(2,1,2,1);
09186                 e->set_value_at(2,2,2,1);
09187 
09188                 Region r = Region(-nx/2+1,-ny/2+1,-nz/2+1,nx,ny,nz);
09189                 e->clip_inplace(r);
09190         }
09191 
09192         Dict conv_parms;
09193         conv_parms["with"] = e;
09194         image->process_inplace("math.convolution", conv_parms);
09195         image->process_inplace("xform.phaseorigin.tocenter");
09196 
09197         delete e;
09198 }


Member Data Documentation

const string XGradientProcessor::NAME = "math.edge.xgradient" [static]
 

Definition at line 557 of file processor.h.

Referenced by get_name().


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