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

Translates a cornered image to the center Undoes the PhaseToCornerProcessor. More...

#include <processor.h>

Inheritance diagram for EMAN::PhaseToCenterProcessor:

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Collaboration diagram for EMAN::PhaseToCenterProcessor:

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List of all members.

Public Member Functions

virtual void process_inplace (EMData *image)
 To process an image in-place.
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.phaseorigin.tocenter"

Detailed Description

Translates a cornered image to the center Undoes the PhaseToCornerProcessor.

works for 1D, 2D and 3D images, for all combinations of even and oddness

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

Definition at line 4840 of file processor.h.


Member Function Documentation

virtual string EMAN::PhaseToCenterProcessor::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 4855 of file processor.h.

04856                         {
04857                                 return "Undoes the effect of the xform.phaseorigin.tocorner processor";
04858                         }

virtual string EMAN::PhaseToCenterProcessor::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 4845 of file processor.h.

References NAME.

04846                         {
04847                                 return NAME;
04848                         }

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

Definition at line 4850 of file processor.h.

04851                         {
04852                                 return new PhaseToCenterProcessor();
04853                         }

void PhaseToCenterProcessor::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 5144 of file processor.cpp.

References emdata_phaseorigin_to_center(), EMAN::Phase180Processor::fourier_phaseshift180(), EMAN::EMData::get_data(), EMAN::EMData::get_ndim(), EMAN::EMData::get_xsize(), EMAN::EMData::get_ysize(), EMAN::EMData::get_zsize(), EMAN::EMData::is_complex(), NullPointerException, rdata, EMAN::Phase180Processor::swap_central_slices_180(), EMAN::Phase180Processor::swap_corners_180(), and UnexpectedBehaviorException.

05145 {
05146         if (!image)     throw NullPointerException("Error: attempt to phase shift a null image");
05147         bool proceed = true;
05148 
05149 #ifdef EMAN2_USING_CUDA
05150         bool cpu = image->cpu_rw_is_current();
05151         bool gpu = image->gpu_rw_is_current();
05152         if ( !cpu && !gpu )
05153                 throw UnexpectedBehaviorException("Both the CPU and GPU data are not current");
05154         if (gpu && image->get_ndim() == 2) { // Because CUDA phase origin to center only works for 2D atm
05155                 EMDataForCuda tmp = image->get_data_struct_for_cuda();
05156                 emdata_phaseorigin_to_center(&tmp);
05157                 proceed = false;
05158                 image->gpu_update();
05159         }
05160 #endif // EMAN2_USING_CUDA
05161         if (!proceed) return; // GPU processing occurred
05162 
05163         if (image->is_complex()) {
05164                 fourier_phaseshift180(image);
05165                 return;
05166         }
05167 
05168         int nx = image->get_xsize();
05169         int ny = image->get_ysize();
05170         int nz = image->get_zsize();
05171 
05172         if ( ny == 1 && nz == 1 && nx == 1) return;
05173 
05174         int nxy = nx * ny;
05175 
05176         float *rdata = image->get_data();
05177 
05178         bool xodd = (nx % 2) == 1;
05179         bool yodd = (ny % 2) == 1;
05180         bool zodd = (nz % 2) == 1;
05181 
05182         if ( ny == 1 && nz == 1 ){
05183                 if (xodd) {
05184                         // Put the center pixel at the end, shifting the contents
05185                         // to right of the center one step to the left
05186                         float in_x = rdata[nx/2];
05187                         float tmp;
05188                         for ( int i = nx-1; i >= nx/2; --i ) {
05189                                 tmp = rdata[i];
05190                                 rdata[i] = in_x;
05191                                 in_x = tmp;
05192                         }
05193                 }
05194                 // now the operation is straight forward
05195                 for ( int i = 0; i < nx/2; ++i ) {
05196                         int idx = i + nx/2;
05197                         float tmp = rdata[i];
05198                         rdata[i] = rdata[idx];
05199                         rdata[idx] = tmp;
05200                 }
05201         }
05202         else if ( nz == 1 ){
05203                 // The order in which these operations occur literally undoes what the
05204                 // PhaseToCornerProcessor did to the image.
05205                 // First, the corners sections of the image are swapped appropriately
05206                 swap_corners_180(image);
05207                 // Second, central pixel lines are swapped
05208                 swap_central_slices_180(image);
05209 
05210                 float tmp;
05211                 // Third, appropriate sections of the image are cyclically shifted by one pixel
05212                 if (xodd) {
05213                         // Transfer the middle column to the far right
05214                         // Shift all from the far right to (but not including the) middle one to the left
05215                         for ( int r  = 0; r < ny; ++r ) {
05216                                 float last_val = rdata[r*nx+nx/2];
05217                                 for ( int c = nx-1; c >=  nx/2; --c ){
05218                                         int idx = r*nx+c;
05219                                         tmp = rdata[idx];
05220                                         rdata[idx] = last_val;
05221                                         last_val = tmp;
05222                                 }
05223                         }
05224                 }
05225                 if (yodd) {
05226                         // Tranfer the middle row to the top,
05227                         // shifting all pixels from the top row down one, until  but not including the) middle
05228                         for ( int c = 0; c < nx; ++c ) {
05229                                 // Get the value in the top row
05230                                 float last_val = rdata[ny/2*nx + c];
05231                                 for ( int r = ny-1; r >= ny/2; --r ){
05232                                         int idx = r*nx+c;
05233                                         tmp = rdata[idx];
05234                                         rdata[idx] = last_val;
05235                                         last_val = tmp;
05236                                 }
05237                         }
05238                 }
05239         }
05240         else
05241         {
05242                 // The order in which these operations occur literally undoes the
05243                 // PhaseToCornerProcessor operation - in 3D.
05244                 // First, the corner quadrants of the voxel volume are swapped
05245                 swap_corners_180(image);
05246                 // Second, appropriate parts of the central slices are swapped
05247                 swap_central_slices_180(image);
05248 
05249                 float tmp;
05250                 // Third, appropriate sections of the image are cyclically shifted by one voxel
05251                 if (xodd) {
05252                         // Transfer the central slice in the x direction to the far right
05253                         // moving all slices on the far right toward the center one pixel, until
05254                         // the center x slice is ecountered
05255                         size_t idx = 0;
05256                         for (int s = 0; s < nz; ++s) {
05257                                 for (int r = 0; r < ny; ++r) {
05258                                         float last_val = rdata[s*nxy+r*nx+nx/2];
05259                                         for (int c = nx-1; c >= nx/2; --c){
05260                                                 idx = s*nxy+r*nx+c;
05261                                                 tmp = rdata[idx];
05262                                                 rdata[idx] = last_val;
05263                                                 last_val = tmp;
05264                                         }
05265                                 }
05266                         }
05267                 }
05268                 if (yodd) {
05269                         // Tranfer the central slice in the y direction to the top
05270                         // shifting all pixels below it down on, until the center y slice is encountered.
05271                         size_t idx = 0;
05272                         for (int s = 0; s < nz; ++s) {
05273                                 for (int c = 0; c < nx; ++c) {
05274                                         float last_val = rdata[s*nxy+ny/2*nx+c];
05275                                         for (int r = ny-1; r >= ny/2; --r){
05276                                                 idx = s*nxy+r*nx+c;
05277                                                 tmp = rdata[idx];
05278                                                 rdata[idx] = last_val;
05279                                                 last_val = tmp;
05280                                         }
05281                                 }
05282                         }
05283                 }
05284                 if (zodd) {
05285                         // Tranfer the central slice in the z direction to the back
05286                         // shifting all pixels beyond and including the middle slice back one.
05287                         size_t idx = 0;
05288                         for (int r = 0; r < ny; ++r){
05289                                 for (int c = 0; c < nx; ++c) {
05290                                         float last_val = rdata[nz/2*nxy+r*nx+c];
05291                                         for (int s = nz-1; s >= nz/2; --s) {
05292                                                 idx = s*nxy+r*nx+c;
05293                                                 tmp = rdata[idx];
05294                                                 rdata[idx] = last_val;
05295                                                 last_val = tmp;
05296                                         }
05297                                 }
05298                         }
05299                 }
05300 
05301 
05302         }
05303 }


Member Data Documentation

const string PhaseToCenterProcessor::NAME = "xform.phaseorigin.tocenter" [static]
 

Definition at line 4860 of file processor.h.

Referenced by get_name().


The documentation for this class was generated from the following files:
Generated on Mon Jul 19 13:07:09 2010 for EMAN2 by  doxygen 1.4.4