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

Undo the effects of the FourierToCenterProcessor. More...

#include <processor.h>

Inheritance diagram for EMAN::FourierToCornerProcessor:

Inheritance graph
[legend]
Collaboration diagram for EMAN::FourierToCornerProcessor:

Collaboration graph
[legend]
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 4677 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 4697 of file processor.h.

04698                         {
04699                                 return "Undoes the xform.fourierorigin.tocenter processor";
04700                         }

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 4687 of file processor.h.

References NAME.

04688                         {
04689                                 return NAME;
04690                         }

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

Definition at line 4692 of file processor.h.

04693                         {
04694                                 return new FourierToCornerProcessor();
04695                         }

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 4430 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().

04431 {
04432         if ( !image->is_complex() ) throw ImageFormatException("Can not Fourier origin shift an image that is not complex");
04433 
04434         int nx=image->get_xsize();
04435         int ny=image->get_ysize();
04436         int nz=image->get_zsize();
04437 
04438         int nxy = nx*ny;
04439 
04440         if ( ny == 1 && nz == 1 ){
04441                 cout << "Warning- attempted     Fourier origin shift a 1D image - no action taken" << endl;
04442                 return;
04443         }
04444         int yodd = (ny%2==1);
04445         int zodd = (nz%2==1);
04446 
04447         float* rdata = image->get_data();
04448 
04449         float tmp[2];
04450         float* p1;
04451         float* p2;
04452 
04453         if (yodd){
04454                 // Swap the middle slice (with respect to the y direction) with the bottom slice
04455                 // shifting all slices above the middles slice upwards by one pixel, stopping
04456                 // at the middle slice, not if nz = 1 we are not talking about slices, we are
04457                 // talking about rows
04458                 float prev[2];
04459                 size_t idx;
04460                 for( int s = 0; s < nz; s++ ) {
04461                         for( int c =0; c < nx; c += 2 ) {
04462                                 idx = (size_t)s*nxy+ny/2*nx+c;
04463                                 prev[0] = rdata[idx];
04464                                 prev[1] = rdata[idx+1];
04465                                 for( int r = 0; r <= ny/2; ++r ) {
04466                                         idx = (size_t)s*nxy+r*nx+c;
04467                                         float* p1 = &rdata[idx];
04468                                         tmp[0] = p1[0];
04469                                         tmp[1] = p1[1];
04470 
04471                                         p1[0] = prev[0];
04472                                         p1[1] = prev[1];
04473 
04474                                         prev[0] = tmp[0];
04475                                         prev[1] = tmp[1];
04476                                 }
04477                         }
04478                 }
04479         }
04480 
04481         // Shift slices (3D) or rows (2D) correctly in the y direction
04482         size_t idx1, idx2;
04483         for( int s = 0; s < nz; ++s ) {
04484                 for( int r = 0 + yodd; r < ny/2+yodd; ++r ) {
04485                         for( int c =0; c < nx; c += 2 ) {
04486                                 idx1 = (size_t)s*nxy+r*nx+c;
04487                                 idx2 = (size_t)s*nxy+(r+ny/2)*nx+c;
04488                                 p1 = &rdata[idx1];
04489                                 p2 = &rdata[idx2];
04490 
04491                                 tmp[0] = p1[0];
04492                                 tmp[1] = p1[1];
04493 
04494                                 p1[0] = p2[0];
04495                                 p1[1] = p2[1];
04496 
04497                                 p2[0] = tmp[0];
04498                                 p2[1] = tmp[1];
04499                         }
04500                 }
04501         }
04502 
04503         if ( nz != 1 )
04504         {
04505 
04506                 if (zodd){
04507                         // Swap the middle slice (with respect to the z direction) and the front slice
04508                         // shifting all behind the front slice towards the middle a distance of 1 voxel,
04509                         // stopping at the middle slice.
04510                         float prev[2];
04511                         size_t idx;
04512                         for( int r = 0; r < ny; ++r ) {
04513                                 for( int c =0; c < nx; c += 2 ) {
04514                                         idx = (size_t)nz/2*nxy+r*nx+c;
04515                                         prev[0] = rdata[idx];
04516                                         prev[1] = rdata[idx+1];
04517                                         for( int s = 0; s <= nz/2; ++s ) {
04518                                                 idx = (size_t)s*nxy+r*nx+c;
04519                                                 float* p1 = &rdata[idx];
04520                                                 tmp[0] = p1[0];
04521                                                 tmp[1] = p1[1];
04522 
04523                                                 p1[0] = prev[0];
04524                                                 p1[1] = prev[1];
04525 
04526                                                 prev[0] = tmp[0];
04527                                                 prev[1] = tmp[1];
04528                                         }
04529                                 }
04530                         }
04531                 }
04532 
04533                 // Shift slices correctly in the z direction
04534                 size_t idx1, idx2;
04535                 for( int s = 0+zodd; s < nz/2 + zodd; ++s ) {
04536                         for( int r = 0; r < ny; ++r ) {
04537                                 for( int c =0; c < nx; c += 2 ) {
04538                                         idx1 = (size_t)s*nxy+r*nx+c;
04539                                         idx2 = (size_t)(s+nz/2)*nxy+r*nx+c;
04540                                         p1 = &rdata[idx1];
04541                                         p2 = &rdata[idx2];
04542 
04543                                         tmp[0] = p1[0];
04544                                         tmp[1] = p1[1];
04545 
04546                                         p1[0] = p2[0];
04547                                         p1[1] = p2[1];
04548 
04549                                         p2[0] = tmp[0];
04550                                         p2[1] = tmp[1];
04551                                 }
04552                         }
04553                 }
04554         }
04555         image->set_shuffled(false);
04556 }


Member Data Documentation

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

Definition at line 4702 of file processor.h.

Referenced by get_name().


The documentation for this class was generated from the following files:
Generated on Tue Jul 12 13:49:22 2011 for EMAN2 by  doxygen 1.4.7