#include <processor.h>
Inheritance diagram for EMAN::FFTResampleProcessor:
Public Member Functions | |
virtual EMData * | process (const EMData *const image) |
To proccess an image out-of-place. | |
virtual void | process_inplace (EMData *image) |
To process an image in-place. | |
string | get_desc () const |
Get the descrition of this specific processor. | |
string | get_name () const |
Get the processor's name. | |
TypeDict | get_param_types () const |
Get processor parameter information in a dictionary. | |
Static Public Member Functions | |
static Processor * | NEW () |
Static Public Attributes | |
static const string | NAME = "math.fft.resample" |
Private Member Functions | |
void | fft_resample (EMData *to, const EMData *const from, const float &sample_rate) |
An internal function that encapsulates a routine common to both process and process inplace. |
Hence it should probably be combined with a damping function near the edge Works for even/odd, 1D, 2D and 3D images (completely robust, tested)
n | sampe_rate |
Definition at line 3544 of file processor.h.
void FFTResampleProcessor::fft_resample | ( | EMData * | to, | |
const EMData *const | from, | |||
const float & | sample_rate | |||
) | [private] |
An internal function that encapsulates a routine common to both process and process inplace.
to | the smaller image that will store the shrunken values | |
from | the larger image that will be used to calculate the shrunken values | |
shrinkfactor | the shrink amount |
Definition at line 2117 of file processor.cpp.
References EMAN::EMData::clip_inplace(), EMAN::EMData::depad_corner(), EMAN::EMData::do_fft_inplace(), EMAN::EMData::do_ift_inplace(), EMAN::EMData::get_ndim(), EMAN::EMData::get_xsize(), EMAN::EMData::get_ysize(), EMAN::EMData::get_zsize(), EMAN::EMData::is_complex(), EMAN::EMData::process_inplace(), EMAN::EMData::set_fftodd(), and UnexpectedBehaviorException.
Referenced by process(), and process_inplace().
02117 { 02118 int nx = from->get_xsize(); 02119 int ny = from->get_ysize(); 02120 int nz = from->get_zsize(); 02121 02122 int new_nx = static_cast<int>( static_cast<float> (nx) / sample_rate); 02123 int new_ny = static_cast<int>( static_cast<float> (ny) / sample_rate); 02124 int new_nz = static_cast<int>( static_cast<float> (nz) / sample_rate); 02125 02126 if (new_nx == 0) throw UnexpectedBehaviorException("The resample rate causes the pixel dimensions in the x direction to go to zero"); 02127 if (new_ny == 0) new_ny = 1; 02128 if (new_nz == 0) new_nz = 1; 02129 02130 int ndim = from->get_ndim(); 02131 if ( ndim < 3 ) { 02132 new_nz = 1; 02133 } 02134 if ( ndim < 2 ) { 02135 new_ny = 1; 02136 } 02137 02138 int fft_x_correction = 1; 02139 if (new_nx % 2 == 0) fft_x_correction = 2; 02140 02141 int fft_y_correction = 0; 02142 if (ny != 1 && new_ny % 2 == 0 && ny % 2 == 1) fft_y_correction = 1; 02143 else if (ny != 1 && new_ny % 2 == 1 && ny % 2 == 0) fft_y_correction = -1; 02144 02145 int fft_z_correction = 0; 02146 if (nz != 1 && new_nz % 2 == 0 && nz % 2 == 1) fft_z_correction = 1; 02147 else if (nz != 1 && new_nz % 2 == 1 && nz % 2 == 0) fft_z_correction = -1; 02148 02149 if ( ! to->is_complex()) to->do_fft_inplace(); 02150 02151 if (ndim != 1) to->process_inplace("xform.fourierorigin.tocenter"); 02152 02153 Region clip(0,(ny-new_ny)/2-fft_y_correction,(nz-new_nz)/2-fft_z_correction,new_nx+fft_x_correction,new_ny,new_nz); 02154 to->clip_inplace(clip); 02155 02156 if (fft_x_correction == 1) to->set_fftodd(true); 02157 else to->set_fftodd(false); 02158 02159 if (ndim != 1) to->process_inplace("xform.fourierorigin.tocorner"); 02160 02161 to->do_ift_inplace(); 02162 to->depad_corner(); 02163 02164 }
string EMAN::FFTResampleProcessor::get_desc | ( | ) | const [inline, virtual] |
Get the descrition of this specific processor.
This function must be overwritten by a subclass.
Implements EMAN::Processor.
Definition at line 3551 of file processor.h.
string EMAN::FFTResampleProcessor::get_name | ( | ) | const [inline, virtual] |
Get the processor's name.
Each processor is identified by a unique name.
Implements EMAN::Processor.
Definition at line 3556 of file processor.h.
References NAME.
03557 { 03558 return NAME; 03559 }
TypeDict EMAN::FFTResampleProcessor::get_param_types | ( | ) | const [inline, virtual] |
Get processor parameter information in a dictionary.
Each parameter has one record in the dictionary. Each record contains its name, data-type, and description.
Reimplemented from EMAN::Processor.
Definition at line 3565 of file processor.h.
References EMAN::EMObject::FLOAT, and EMAN::TypeDict::put().
03566 { 03567 TypeDict d; 03568 d.put("n", EMObject::FLOAT, "The sample rate. Less than one enlarges the image, greater than one shrinks it."); 03569 return d; 03570 }
static Processor* EMAN::FFTResampleProcessor::NEW | ( | ) | [inline, static] |
Definition at line 3560 of file processor.h.
03561 { 03562 return new FFTResampleProcessor(); 03563 }
To proccess an image out-of-place.
For those processors which can only be processed out-of-place, override this function to give the right behavior.
image | The image will be copied, actual process happen on copy of image. |
Reimplemented from EMAN::Processor.
Definition at line 2082 of file processor.cpp.
References EMAN::EMData::copy(), EMAN::EMData::do_fft(), fft_resample(), InvalidValueException, EMAN::EMData::is_complex(), EMAN::Processor::params, EMAN::EMData::scale_pixel(), EMAN::Dict::set_default(), and EMAN::EMData::update().
02083 { 02084 float sample_rate = params.set_default("n",0.0f); 02085 if (sample_rate <= 0.0F ) { 02086 throw InvalidValueException(sample_rate, "sample rate must be >0 "); 02087 } 02088 02089 EMData* result; 02090 if (image->is_complex()) result = image->copy(); 02091 else result = image->do_fft(); 02092 fft_resample(result,image,sample_rate); 02093 // The image may have been padded - we should shift it so that the phase origin is where FFTW expects it 02094 result->update(); 02095 result->scale_pixel(sample_rate); 02096 return result; 02097 }
void FFTResampleProcessor::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.
image | The image to be processed. |
Implements EMAN::Processor.
Definition at line 2099 of file processor.cpp.
References fft_resample(), ImageFormatException, InvalidValueException, EMAN::EMData::is_complex(), EMAN::Processor::params, EMAN::EMData::scale_pixel(), EMAN::Dict::set_default(), and EMAN::EMData::update().
02100 { 02101 if (image->is_complex()) throw ImageFormatException("Error, the fft resampling processor does not work on complex images"); 02102 02103 02104 float sample_rate = params.set_default("n",0.0f); 02105 if (sample_rate <= 0.0F ) { 02106 throw InvalidValueException(sample_rate, "sample rate (n) must be >0 "); 02107 } 02108 02109 fft_resample(image,image,sample_rate); 02110 02111 image->scale_pixel(sample_rate); 02112 image->update(); 02113 02114 02115 }
const string FFTResampleProcessor::NAME = "math.fft.resample" [static] |