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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 4673 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 4693 of file processor.h.

04694                         {
04695                                 return "Undoes the xform.fourierorigin.tocenter processor";
04696                         }

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 4683 of file processor.h.

04684                         {
04685                                 return NAME;
04686                         }

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

Definition at line 4688 of file processor.h.

04689                         {
04690                                 return new FourierToCornerProcessor();
04691                         }

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 4342 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().

04343 {
04344         if ( !image->is_complex() ) throw ImageFormatException("Can not Fourier origin shift an image that is not complex");
04345 
04346         int nx=image->get_xsize();
04347         int ny=image->get_ysize();
04348         int nz=image->get_zsize();
04349 
04350         int nxy = nx*ny;
04351 
04352         if ( ny == 1 && nz == 1 ){
04353                 cout << "Warning- attempted     Fourier origin shift a 1D image - no action taken" << endl;
04354                 return;
04355         }
04356         int yodd = (ny%2==1);
04357         int zodd = (nz%2==1);
04358 
04359         float* rdata = image->get_data();
04360 
04361         float tmp[2];
04362         float* p1;
04363         float* p2;
04364 
04365         if (yodd){
04366                 // Swap the middle slice (with respect to the y direction) with the bottom slice
04367                 // shifting all slices above the middles slice upwards by one pixel, stopping
04368                 // at the middle slice, not if nz = 1 we are not talking about slices, we are
04369                 // talking about rows
04370                 float prev[2];
04371                 size_t idx;
04372                 for( int s = 0; s < nz; s++ ) {
04373                         for( int c =0; c < nx; c += 2 ) {
04374                                 idx = s*nxy+ny/2*nx+c;
04375                                 prev[0] = rdata[idx];
04376                                 prev[1] = rdata[idx+1];
04377                                 for( int r = 0; r <= ny/2; ++r ) {
04378                                         idx = s*nxy+r*nx+c;
04379                                         float* p1 = &rdata[idx];
04380                                         tmp[0] = p1[0];
04381                                         tmp[1] = p1[1];
04382 
04383                                         p1[0] = prev[0];
04384                                         p1[1] = prev[1];
04385 
04386                                         prev[0] = tmp[0];
04387                                         prev[1] = tmp[1];
04388                                 }
04389                         }
04390                 }
04391         }
04392 
04393         // Shift slices (3D) or rows (2D) correctly in the y direction
04394         size_t idx1, idx2;
04395         for( int s = 0; s < nz; ++s ) {
04396                 for( int r = 0 + yodd; r < ny/2+yodd; ++r ) {
04397                         for( int c =0; c < nx; c += 2 ) {
04398                                 idx1 = s*nxy+r*nx+c;
04399                                 idx2 = s*nxy+(r+ny/2)*nx+c;
04400                                 p1 = &rdata[idx1];
04401                                 p2 = &rdata[idx2];
04402 
04403                                 tmp[0] = p1[0];
04404                                 tmp[1] = p1[1];
04405 
04406                                 p1[0] = p2[0];
04407                                 p1[1] = p2[1];
04408 
04409                                 p2[0] = tmp[0];
04410                                 p2[1] = tmp[1];
04411                         }
04412                 }
04413         }
04414 
04415         if ( nz != 1 )
04416         {
04417 
04418                 if (zodd){
04419                         // Swap the middle slice (with respect to the z direction) and the front slice
04420                         // shifting all behind the front slice towards the middle a distance of 1 voxel,
04421                         // stopping at the middle slice.
04422                         float prev[2];
04423                         size_t idx;
04424                         for( int r = 0; r < ny; ++r ) {
04425                                 for( int c =0; c < nx; c += 2 ) {
04426                                         idx = nz/2*nxy+r*nx+c;
04427                                         prev[0] = rdata[idx];
04428                                         prev[1] = rdata[idx+1];
04429                                         for( int s = 0; s <= nz/2; ++s ) {
04430                                                 idx = s*nxy+r*nx+c;
04431                                                 float* p1 = &rdata[idx];
04432                                                 tmp[0] = p1[0];
04433                                                 tmp[1] = p1[1];
04434 
04435                                                 p1[0] = prev[0];
04436                                                 p1[1] = prev[1];
04437 
04438                                                 prev[0] = tmp[0];
04439                                                 prev[1] = tmp[1];
04440                                         }
04441                                 }
04442                         }
04443                 }
04444 
04445                 // Shift slices correctly in the z direction
04446                 size_t idx1, idx2;
04447                 for( int s = 0+zodd; s < nz/2 + zodd; ++s ) {
04448                         for( int r = 0; r < ny; ++r ) {
04449                                 for( int c =0; c < nx; c += 2 ) {
04450                                         idx1 = s*nxy+r*nx+c;
04451                                         idx2 = (s+nz/2)*nxy+r*nx+c;
04452                                         p1 = &rdata[idx1];
04453                                         p2 = &rdata[idx2];
04454 
04455                                         tmp[0] = p1[0];
04456                                         tmp[1] = p1[1];
04457 
04458                                         p1[0] = p2[0];
04459                                         p1[1] = p2[1];
04460 
04461                                         p2[0] = tmp[0];
04462                                         p2[1] = tmp[1];
04463                                 }
04464                         }
04465                 }
04466         }
04467         image->set_shuffled(false);
04468 }


Member Data Documentation

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

Definition at line 161 of file processor.cpp.


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