#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 3365 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 1997 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(). 01997 { 01998 int nx = from->get_xsize(); 01999 int ny = from->get_ysize(); 02000 int nz = from->get_zsize(); 02001 02002 int new_nx = static_cast<int>( static_cast<float> (nx) / sample_rate); 02003 int new_ny = static_cast<int>( static_cast<float> (ny) / sample_rate); 02004 int new_nz = static_cast<int>( static_cast<float> (nz) / sample_rate); 02005 02006 if (new_nx == 0) throw UnexpectedBehaviorException("The resample rate causes the pixel dimensions in the x direction to go to zero"); 02007 if (new_ny == 0) new_ny = 1; 02008 if (new_nz == 0) new_nz = 1; 02009 02010 int ndim = from->get_ndim(); 02011 if ( ndim < 3 ) { 02012 new_nz = 1; 02013 } 02014 if ( ndim < 2 ) { 02015 new_ny = 1; 02016 } 02017 02018 int fft_x_correction = 1; 02019 if (new_nx % 2 == 0) fft_x_correction = 2; 02020 02021 int fft_y_correction = 0; 02022 if (ny != 1 && new_ny % 2 == 0 && ny % 2 == 1) fft_y_correction = 1; 02023 else if (ny != 1 && new_ny % 2 == 1 && ny % 2 == 0) fft_y_correction = -1; 02024 02025 int fft_z_correction = 0; 02026 if (nz != 1 && new_nz % 2 == 0 && nz % 2 == 1) fft_z_correction = 1; 02027 else if (nz != 1 && new_nz % 2 == 1 && nz % 2 == 0) fft_z_correction = -1; 02028 02029 if ( ! to->is_complex()) to->do_fft_inplace(); 02030 02031 if (ndim != 1) to->process_inplace("xform.fourierorigin.tocenter"); 02032 02033 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); 02034 to->clip_inplace(clip); 02035 02036 if (fft_x_correction == 1) to->set_fftodd(true); 02037 else to->set_fftodd(false); 02038 02039 if (ndim != 1) to->process_inplace("xform.fourierorigin.tocorner"); 02040 02041 to->do_ift_inplace(); 02042 to->depad_corner(); 02043 02044 }
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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 3372 of file processor.h. 03373 { 03374 return "Robust resampling of an image by clipping its Fourier transform."; 03375 }
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Get the processor's name. Each processor is identified by a unique name.
Implements EMAN::Processor. Definition at line 3377 of file processor.h. 03378 {
03379 return NAME;
03380 }
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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 3386 of file processor.h. References EMAN::TypeDict::put(). 03387 { 03388 TypeDict d; 03389 d.put("n", EMObject::FLOAT, "The sample rate. Less than one enlarges the image, greater than one shrinks it."); 03390 return d; 03391 }
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Definition at line 3381 of file processor.h. 03382 { 03383 return new FFTResampleProcessor(); 03384 }
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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 1962 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(). 01963 { 01964 float sample_rate = params.set_default("n",0.0f); 01965 if (sample_rate <= 0.0F ) { 01966 throw InvalidValueException(sample_rate, "sample rate must be >0 "); 01967 } 01968 01969 EMData* result; 01970 if (image->is_complex()) result = image->copy(); 01971 else result = image->do_fft(); 01972 fft_resample(result,image,sample_rate); 01973 // The image may have been padded - we should shift it so that the phase origin is where FFTW expects it 01974 result->update(); 01975 result->scale_pixel(sample_rate); 01976 return result; 01977 }
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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 1979 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(). 01980 { 01981 if (image->is_complex()) throw ImageFormatException("Error, the fft resampling processor does not work on complex images"); 01982 01983 01984 float sample_rate = params.set_default("n",0.0f); 01985 if (sample_rate <= 0.0F ) { 01986 throw InvalidValueException(sample_rate, "sample rate (n) must be >0 "); 01987 } 01988 01989 fft_resample(image,image,sample_rate); 01990 01991 image->scale_pixel(sample_rate); 01992 image->update(); 01993 01994 01995 }
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Definition at line 122 of file processor.cpp. |