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 4800 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 4815 of file processor.h.

04816                         {
04817                                 return "Undoes the effect of the xform.phaseorigin.tocorner processor";
04818                         }

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 4805 of file processor.h.

References NAME.

04806                         {
04807                                 return NAME;
04808                         }

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

Definition at line 4810 of file processor.h.

04811                         {
04812                                 return new PhaseToCenterProcessor();
04813                         }

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 5037 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.

05038 {
05039         if (!image)     throw NullPointerException("Error: attempt to phase shift a null image");
05040         bool proceed = true;
05041 
05042 #ifdef EMAN2_USING_CUDA
05043         bool cpu = image->cpu_rw_is_current();
05044         bool gpu = image->gpu_rw_is_current();
05045         if ( !cpu && !gpu )
05046                 throw UnexpectedBehaviorException("Both the CPU and GPU data are not current");
05047         if (gpu && image->get_ndim() == 2) { // Because CUDA phase origin to center only works for 2D atm
05048                 EMDataForCuda tmp = image->get_data_struct_for_cuda();
05049                 emdata_phaseorigin_to_center(&tmp);
05050                 proceed = false;
05051                 image->gpu_update();
05052         }
05053 #endif // EMAN2_USING_CUDA
05054         if (!proceed) return; // GPU processing occurred
05055 
05056         if (image->is_complex()) {
05057                 fourier_phaseshift180(image);
05058                 return;
05059         }
05060 
05061         int nx = image->get_xsize();
05062         int ny = image->get_ysize();
05063         int nz = image->get_zsize();
05064 
05065         if ( ny == 1 && nz == 1 && nx == 1) return;
05066 
05067         int nxy = nx * ny;
05068 
05069         float *rdata = image->get_data();
05070 
05071         bool xodd = (nx % 2) == 1;
05072         bool yodd = (ny % 2) == 1;
05073         bool zodd = (nz % 2) == 1;
05074 
05075         if ( ny == 1 && nz == 1 ){
05076                 if (xodd) {
05077                         // Put the center pixel at the end, shifting the contents
05078                         // to right of the center one step to the left
05079                         float in_x = rdata[nx/2];
05080                         float tmp;
05081                         for ( int i = nx-1; i >= nx/2; --i ) {
05082                                 tmp = rdata[i];
05083                                 rdata[i] = in_x;
05084                                 in_x = tmp;
05085                         }
05086                 }
05087                 // now the operation is straight forward
05088                 for ( int i = 0; i < nx/2; ++i ) {
05089                         int idx = i + nx/2;
05090                         float tmp = rdata[i];
05091                         rdata[i] = rdata[idx];
05092                         rdata[idx] = tmp;
05093                 }
05094         }
05095         else if ( nz == 1 ){
05096                 // The order in which these operations occur literally undoes what the
05097                 // PhaseToCornerProcessor did to the image.
05098                 // First, the corners sections of the image are swapped appropriately
05099                 swap_corners_180(image);
05100                 // Second, central pixel lines are swapped
05101                 swap_central_slices_180(image);
05102 
05103                 float tmp;
05104                 // Third, appropriate sections of the image are cyclically shifted by one pixel
05105                 if (xodd) {
05106                         // Transfer the middle column to the far right
05107                         // Shift all from the far right to (but not including the) middle one to the left
05108                         for ( int r  = 0; r < ny; ++r ) {
05109                                 float last_val = rdata[r*nx+nx/2];
05110                                 for ( int c = nx-1; c >=  nx/2; --c ){
05111                                         int idx = r*nx+c;
05112                                         tmp = rdata[idx];
05113                                         rdata[idx] = last_val;
05114                                         last_val = tmp;
05115                                 }
05116                         }
05117                 }
05118                 if (yodd) {
05119                         // Tranfer the middle row to the top,
05120                         // shifting all pixels from the top row down one, until  but not including the) middle
05121                         for ( int c = 0; c < nx; ++c ) {
05122                                 // Get the value in the top row
05123                                 float last_val = rdata[ny/2*nx + c];
05124                                 for ( int r = ny-1; r >= ny/2; --r ){
05125                                         int idx = r*nx+c;
05126                                         tmp = rdata[idx];
05127                                         rdata[idx] = last_val;
05128                                         last_val = tmp;
05129                                 }
05130                         }
05131                 }
05132         }
05133         else
05134         {
05135                 // The order in which these operations occur literally undoes the
05136                 // PhaseToCornerProcessor operation - in 3D.
05137                 // First, the corner quadrants of the voxel volume are swapped
05138                 swap_corners_180(image);
05139                 // Second, appropriate parts of the central slices are swapped
05140                 swap_central_slices_180(image);
05141 
05142                 float tmp;
05143                 // Third, appropriate sections of the image are cyclically shifted by one voxel
05144                 if (xodd) {
05145                         // Transfer the central slice in the x direction to the far right
05146                         // moving all slices on the far right toward the center one pixel, until
05147                         // the center x slice is ecountered
05148                         size_t idx = 0;
05149                         for (int s = 0; s < nz; ++s) {
05150                                 for (int r = 0; r < ny; ++r) {
05151                                         float last_val = rdata[s*nxy+r*nx+nx/2];
05152                                         for (int c = nx-1; c >= nx/2; --c){
05153                                                 idx = s*nxy+r*nx+c;
05154                                                 tmp = rdata[idx];
05155                                                 rdata[idx] = last_val;
05156                                                 last_val = tmp;
05157                                         }
05158                                 }
05159                         }
05160                 }
05161                 if (yodd) {
05162                         // Tranfer the central slice in the y direction to the top
05163                         // shifting all pixels below it down on, until the center y slice is encountered.
05164                         size_t idx = 0;
05165                         for (int s = 0; s < nz; ++s) {
05166                                 for (int c = 0; c < nx; ++c) {
05167                                         float last_val = rdata[s*nxy+ny/2*nx+c];
05168                                         for (int r = ny-1; r >= ny/2; --r){
05169                                                 idx = s*nxy+r*nx+c;
05170                                                 tmp = rdata[idx];
05171                                                 rdata[idx] = last_val;
05172                                                 last_val = tmp;
05173                                         }
05174                                 }
05175                         }
05176                 }
05177                 if (zodd) {
05178                         // Tranfer the central slice in the z direction to the back
05179                         // shifting all pixels beyond and including the middle slice back one.
05180                         size_t idx = 0;
05181                         for (int r = 0; r < ny; ++r){
05182                                 for (int c = 0; c < nx; ++c) {
05183                                         float last_val = rdata[nz/2*nxy+r*nx+c];
05184                                         for (int s = nz-1; s >= nz/2; --s) {
05185                                                 idx = s*nxy+r*nx+c;
05186                                                 tmp = rdata[idx];
05187                                                 rdata[idx] = last_val;
05188                                                 last_val = tmp;
05189                                         }
05190                                 }
05191                         }
05192                 }
05193 
05194 
05195         }
05196 }


Member Data Documentation

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

Definition at line 4820 of file processor.h.

Referenced by get_name().


The documentation for this class was generated from the following files:
Generated on Tue May 25 17:17:17 2010 for EMAN2 by  doxygen 1.4.7