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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

static ProcessorNEW ()

Static Public Attributes

static 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 4674 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 4694 of file processor.h.

04695                         {
04696                                 return "Undoes the xform.fourierorigin.tocenter processor";
04697                         }

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 4684 of file processor.h.

References NAME.

04685                         {
04686                                 return NAME;
04687                         }

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

Definition at line 4689 of file processor.h.

04690                         {
04691                                 return new FourierToCornerProcessor();
04692                         }

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 4373 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(), rdata, and EMAN::EMData::set_shuffled().

04374 {
04375         if ( !image->is_complex() ) throw ImageFormatException("Can not Fourier origin shift an image that is not complex");
04376 
04377         int nx=image->get_xsize();
04378         int ny=image->get_ysize();
04379         int nz=image->get_zsize();
04380 
04381         int nxy = nx*ny;
04382 
04383         if ( ny == 1 && nz == 1 ){
04384                 cout << "Warning- attempted     Fourier origin shift a 1D image - no action taken" << endl;
04385                 return;
04386         }
04387         int yodd = (ny%2==1);
04388         int zodd = (nz%2==1);
04389 
04390         float* rdata = image->get_data();
04391 
04392         float tmp[2];
04393         float* p1;
04394         float* p2;
04395 
04396         if (yodd){
04397                 // Swap the middle slice (with respect to the y direction) with the bottom slice
04398                 // shifting all slices above the middles slice upwards by one pixel, stopping
04399                 // at the middle slice, not if nz = 1 we are not talking about slices, we are
04400                 // talking about rows
04401                 float prev[2];
04402                 size_t idx;
04403                 for( int s = 0; s < nz; s++ ) {
04404                         for( int c =0; c < nx; c += 2 ) {
04405                                 idx = s*nxy+ny/2*nx+c;
04406                                 prev[0] = rdata[idx];
04407                                 prev[1] = rdata[idx+1];
04408                                 for( int r = 0; r <= ny/2; ++r ) {
04409                                         idx = s*nxy+r*nx+c;
04410                                         float* p1 = &rdata[idx];
04411                                         tmp[0] = p1[0];
04412                                         tmp[1] = p1[1];
04413 
04414                                         p1[0] = prev[0];
04415                                         p1[1] = prev[1];
04416 
04417                                         prev[0] = tmp[0];
04418                                         prev[1] = tmp[1];
04419                                 }
04420                         }
04421                 }
04422         }
04423 
04424         // Shift slices (3D) or rows (2D) correctly in the y direction
04425         size_t idx1, idx2;
04426         for( int s = 0; s < nz; ++s ) {
04427                 for( int r = 0 + yodd; r < ny/2+yodd; ++r ) {
04428                         for( int c =0; c < nx; c += 2 ) {
04429                                 idx1 = s*nxy+r*nx+c;
04430                                 idx2 = s*nxy+(r+ny/2)*nx+c;
04431                                 p1 = &rdata[idx1];
04432                                 p2 = &rdata[idx2];
04433 
04434                                 tmp[0] = p1[0];
04435                                 tmp[1] = p1[1];
04436 
04437                                 p1[0] = p2[0];
04438                                 p1[1] = p2[1];
04439 
04440                                 p2[0] = tmp[0];
04441                                 p2[1] = tmp[1];
04442                         }
04443                 }
04444         }
04445 
04446         if ( nz != 1 )
04447         {
04448 
04449                 if (zodd){
04450                         // Swap the middle slice (with respect to the z direction) and the front slice
04451                         // shifting all behind the front slice towards the middle a distance of 1 voxel,
04452                         // stopping at the middle slice.
04453                         float prev[2];
04454                         size_t idx;
04455                         for( int r = 0; r < ny; ++r ) {
04456                                 for( int c =0; c < nx; c += 2 ) {
04457                                         idx = nz/2*nxy+r*nx+c;
04458                                         prev[0] = rdata[idx];
04459                                         prev[1] = rdata[idx+1];
04460                                         for( int s = 0; s <= nz/2; ++s ) {
04461                                                 idx = s*nxy+r*nx+c;
04462                                                 float* p1 = &rdata[idx];
04463                                                 tmp[0] = p1[0];
04464                                                 tmp[1] = p1[1];
04465 
04466                                                 p1[0] = prev[0];
04467                                                 p1[1] = prev[1];
04468 
04469                                                 prev[0] = tmp[0];
04470                                                 prev[1] = tmp[1];
04471                                         }
04472                                 }
04473                         }
04474                 }
04475 
04476                 // Shift slices correctly in the z direction
04477                 size_t idx1, idx2;
04478                 for( int s = 0+zodd; s < nz/2 + zodd; ++s ) {
04479                         for( int r = 0; r < ny; ++r ) {
04480                                 for( int c =0; c < nx; c += 2 ) {
04481                                         idx1 = s*nxy+r*nx+c;
04482                                         idx2 = (s+nz/2)*nxy+r*nx+c;
04483                                         p1 = &rdata[idx1];
04484                                         p2 = &rdata[idx2];
04485 
04486                                         tmp[0] = p1[0];
04487                                         tmp[1] = p1[1];
04488 
04489                                         p1[0] = p2[0];
04490                                         p1[1] = p2[1];
04491 
04492                                         p2[0] = tmp[0];
04493                                         p2[1] = tmp[1];
04494                                 }
04495                         }
04496                 }
04497         }
04498         image->set_shuffled(false);
04499 }


Member Data Documentation

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

Definition at line 4699 of file processor.h.

Referenced by get_name().


The documentation for this class was generated from the following files:
Generated on Tue May 25 17:37:33 2010 for EMAN2 by  doxygen 1.4.4