#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 | |
Processor * | NEW () |
Static Public Attributes | |
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 3540 of file processor.h.
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An internal function that encapsulates a routine common to both process and process inplace.
Definition at line 2052 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(), nx, ny, EMAN::EMData::process_inplace(), EMAN::EMData::set_fftodd(), and UnexpectedBehaviorException. Referenced by process(), and process_inplace(). 02052 { 02053 int nx = from->get_xsize(); 02054 int ny = from->get_ysize(); 02055 int nz = from->get_zsize(); 02056 02057 int new_nx = static_cast<int>( static_cast<float> (nx) / sample_rate); 02058 int new_ny = static_cast<int>( static_cast<float> (ny) / sample_rate); 02059 int new_nz = static_cast<int>( static_cast<float> (nz) / sample_rate); 02060 02061 if (new_nx == 0) throw UnexpectedBehaviorException("The resample rate causes the pixel dimensions in the x direction to go to zero"); 02062 if (new_ny == 0) new_ny = 1; 02063 if (new_nz == 0) new_nz = 1; 02064 02065 int ndim = from->get_ndim(); 02066 if ( ndim < 3 ) { 02067 new_nz = 1; 02068 } 02069 if ( ndim < 2 ) { 02070 new_ny = 1; 02071 } 02072 02073 int fft_x_correction = 1; 02074 if (new_nx % 2 == 0) fft_x_correction = 2; 02075 02076 int fft_y_correction = 0; 02077 if (ny != 1 && new_ny % 2 == 0 && ny % 2 == 1) fft_y_correction = 1; 02078 else if (ny != 1 && new_ny % 2 == 1 && ny % 2 == 0) fft_y_correction = -1; 02079 02080 int fft_z_correction = 0; 02081 if (nz != 1 && new_nz % 2 == 0 && nz % 2 == 1) fft_z_correction = 1; 02082 else if (nz != 1 && new_nz % 2 == 1 && nz % 2 == 0) fft_z_correction = -1; 02083 02084 if ( ! to->is_complex()) to->do_fft_inplace(); 02085 02086 if (ndim != 1) to->process_inplace("xform.fourierorigin.tocenter"); 02087 02088 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); 02089 to->clip_inplace(clip); 02090 02091 if (fft_x_correction == 1) to->set_fftodd(true); 02092 else to->set_fftodd(false); 02093 02094 if (ndim != 1) to->process_inplace("xform.fourierorigin.tocorner"); 02095 02096 to->do_ift_inplace(); 02097 to->depad_corner(); 02098 02099 }
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Get the descrition of this specific processor. This function must be overwritten by a subclass.
Implements EMAN::Processor. Definition at line 3547 of file processor.h. 03548 { 03549 return "Robust resampling of an image by clipping its Fourier transform."; 03550 }
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Get the processor's name. Each processor is identified by a unique name.
Implements EMAN::Processor. Definition at line 3552 of file processor.h. 03553 {
03554 return NAME;
03555 }
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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 3561 of file processor.h. References EMAN::TypeDict::put(). 03562 { 03563 TypeDict d; 03564 d.put("n", EMObject::FLOAT, "The sample rate. Less than one enlarges the image, greater than one shrinks it."); 03565 return d; 03566 }
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Definition at line 3556 of file processor.h. 03557 { 03558 return new FFTResampleProcessor(); 03559 }
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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.
Reimplemented from EMAN::Processor. Definition at line 2017 of file processor.cpp. References EMAN::EMData::copy(), EMAN::EMData::do_fft(), fft_resample(), InvalidValueException, EMAN::EMData::is_complex(), EMAN::EMData::scale_pixel(), EMAN::Dict::set_default(), and EMAN::EMData::update(). 02018 { 02019 float sample_rate = params.set_default("n",0.0f); 02020 if (sample_rate <= 0.0F ) { 02021 throw InvalidValueException(sample_rate, "sample rate must be >0 "); 02022 } 02023 02024 EMData* result; 02025 if (image->is_complex()) result = image->copy(); 02026 else result = image->do_fft(); 02027 fft_resample(result,image,sample_rate); 02028 // The image may have been padded - we should shift it so that the phase origin is where FFTW expects it 02029 result->update(); 02030 result->scale_pixel(sample_rate); 02031 return result; 02032 }
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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.
Implements EMAN::Processor. Definition at line 2034 of file processor.cpp. References fft_resample(), ImageFormatException, InvalidValueException, EMAN::EMData::is_complex(), EMAN::EMData::scale_pixel(), EMAN::Dict::set_default(), and EMAN::EMData::update(). 02035 { 02036 if (image->is_complex()) throw ImageFormatException("Error, the fft resampling processor does not work on complex images"); 02037 02038 02039 float sample_rate = params.set_default("n",0.0f); 02040 if (sample_rate <= 0.0F ) { 02041 throw InvalidValueException(sample_rate, "sample rate (n) must be >0 "); 02042 } 02043 02044 fft_resample(image,image,sample_rate); 02045 02046 image->scale_pixel(sample_rate); 02047 image->update(); 02048 02049 02050 }
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Definition at line 128 of file processor.cpp. |