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EMAN::FourierToCornerProcessor Class Reference
[unit test in Python]

Undo the effects of the FourierToCenterProcessor. More...

#include <processor.h>

Inheritance diagram for EMAN::FourierToCornerProcessor:

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Collaboration diagram for EMAN::FourierToCornerProcessor:

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List of all members.

Public Member Functions

virtual void process_inplace (EMData *image)
 Fourier origin shift the image in the backwards direction Should only be called after the application of FourierToCenterProcessor.
virtual string get_name () const
 Get the processor's name.
virtual string get_desc () const
 Get the descrition of this specific processor.

Static Public Member Functions

ProcessorNEW ()

Static Public Attributes

const string NAME = "xform.fourierorigin.tocorner"

Detailed Description

Undo the effects of the FourierToCenterProcessor.

Author:
David Woolford <woolford@bcm.edu>
Date:
October 2007

Definition at line 4753 of file processor.h.


Member Function Documentation

virtual string EMAN::FourierToCornerProcessor::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 4773 of file processor.h.

04774                         {
04775                                 return "Undoes the xform.fourierorigin.tocenter processor";
04776                         }

virtual string EMAN::FourierToCornerProcessor::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 4763 of file processor.h.

04764                         {
04765                                 return NAME;
04766                         }

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

Definition at line 4768 of file processor.h.

04769                         {
04770                                 return new FourierToCornerProcessor();
04771                         }

void FourierToCornerProcessor::process_inplace EMData image  )  [virtual]
 

Fourier origin shift the image in the backwards direction Should only be called after the application of FourierToCenterProcessor.

Parameters:
image the image to operate on
Exceptions:
ImageFormatException if the image is not complex

Implements EMAN::Processor.

Definition at line 4521 of file processor.cpp.

References EMAN::EMData::get_data(), EMAN::EMData::get_xsize(), EMAN::EMData::get_ysize(), EMAN::EMData::get_zsize(), ImageFormatException, EMAN::EMData::is_complex(), nx, ny, rdata, and EMAN::EMData::set_shuffled().

04522 {
04523         if ( !image->is_complex() ) throw ImageFormatException("Can not Fourier origin shift an image that is not complex");
04524 
04525         int nx=image->get_xsize();
04526         int ny=image->get_ysize();
04527         int nz=image->get_zsize();
04528 
04529         int nxy = nx*ny;
04530 
04531         if ( ny == 1 && nz == 1 ){
04532                 cout << "Warning- attempted     Fourier origin shift a 1D image - no action taken" << endl;
04533                 return;
04534         }
04535         int yodd = (ny%2==1);
04536         int zodd = (nz%2==1);
04537 
04538         float* rdata = image->get_data();
04539 
04540         float tmp[2];
04541         float* p1;
04542         float* p2;
04543 
04544         if (yodd){
04545                 // Swap the middle slice (with respect to the y direction) with the bottom slice
04546                 // shifting all slices above the middles slice upwards by one pixel, stopping
04547                 // at the middle slice, not if nz = 1 we are not talking about slices, we are
04548                 // talking about rows
04549                 float prev[2];
04550                 size_t idx;
04551                 for( int s = 0; s < nz; s++ ) {
04552                         for( int c =0; c < nx; c += 2 ) {
04553                                 idx = (size_t)s*nxy+ny/2*nx+c;
04554                                 prev[0] = rdata[idx];
04555                                 prev[1] = rdata[idx+1];
04556                                 for( int r = 0; r <= ny/2; ++r ) {
04557                                         idx = (size_t)s*nxy+r*nx+c;
04558                                         float* p1 = &rdata[idx];
04559                                         tmp[0] = p1[0];
04560                                         tmp[1] = p1[1];
04561 
04562                                         p1[0] = prev[0];
04563                                         p1[1] = prev[1];
04564 
04565                                         prev[0] = tmp[0];
04566                                         prev[1] = tmp[1];
04567                                 }
04568                         }
04569                 }
04570         }
04571 
04572         // Shift slices (3D) or rows (2D) correctly in the y direction
04573         size_t idx1, idx2;
04574         for( int s = 0; s < nz; ++s ) {
04575                 for( int r = 0 + yodd; r < ny/2+yodd; ++r ) {
04576                         for( int c =0; c < nx; c += 2 ) {
04577                                 idx1 = (size_t)s*nxy+r*nx+c;
04578                                 idx2 = (size_t)s*nxy+(r+ny/2)*nx+c;
04579                                 p1 = &rdata[idx1];
04580                                 p2 = &rdata[idx2];
04581 
04582                                 tmp[0] = p1[0];
04583                                 tmp[1] = p1[1];
04584 
04585                                 p1[0] = p2[0];
04586                                 p1[1] = p2[1];
04587 
04588                                 p2[0] = tmp[0];
04589                                 p2[1] = tmp[1];
04590                         }
04591                 }
04592         }
04593 
04594         if ( nz != 1 )
04595         {
04596 
04597                 if (zodd){
04598                         // Swap the middle slice (with respect to the z direction) and the front slice
04599                         // shifting all behind the front slice towards the middle a distance of 1 voxel,
04600                         // stopping at the middle slice.
04601                         float prev[2];
04602                         size_t idx;
04603                         for( int r = 0; r < ny; ++r ) {
04604                                 for( int c =0; c < nx; c += 2 ) {
04605                                         idx = (size_t)nz/2*nxy+r*nx+c;
04606                                         prev[0] = rdata[idx];
04607                                         prev[1] = rdata[idx+1];
04608                                         for( int s = 0; s <= nz/2; ++s ) {
04609                                                 idx = (size_t)s*nxy+r*nx+c;
04610                                                 float* p1 = &rdata[idx];
04611                                                 tmp[0] = p1[0];
04612                                                 tmp[1] = p1[1];
04613 
04614                                                 p1[0] = prev[0];
04615                                                 p1[1] = prev[1];
04616 
04617                                                 prev[0] = tmp[0];
04618                                                 prev[1] = tmp[1];
04619                                         }
04620                                 }
04621                         }
04622                 }
04623 
04624                 // Shift slices correctly in the z direction
04625                 size_t idx1, idx2;
04626                 for( int s = 0+zodd; s < nz/2 + zodd; ++s ) {
04627                         for( int r = 0; r < ny; ++r ) {
04628                                 for( int c =0; c < nx; c += 2 ) {
04629                                         idx1 = (size_t)s*nxy+r*nx+c;
04630                                         idx2 = (size_t)(s+nz/2)*nxy+r*nx+c;
04631                                         p1 = &rdata[idx1];
04632                                         p2 = &rdata[idx2];
04633 
04634                                         tmp[0] = p1[0];
04635                                         tmp[1] = p1[1];
04636 
04637                                         p1[0] = p2[0];
04638                                         p1[1] = p2[1];
04639 
04640                                         p2[0] = tmp[0];
04641                                         p2[1] = tmp[1];
04642                                 }
04643                         }
04644                 }
04645         }
04646         image->set_shuffled(false);
04647 }


Member Data Documentation

const string FourierToCornerProcessor::NAME = "xform.fourierorigin.tocorner" [static]
 

Definition at line 162 of file processor.cpp.


The documentation for this class was generated from the following files:
Generated on Mon Aug 13 13:42:18 2012 for EMAN2 by  doxygen 1.3.9.1