EMAN::Rotate180Processor Class Reference

Rotate by 180 using pixel swapping, works for 2D only. More...

#include <processor.h>

Inheritance diagram for EMAN::Rotate180Processor:

Collaboration diagram for EMAN::Rotate180Processor:

Public Member Functions
string	get_name () const
	Get the processor's name. More...
void	process_inplace (EMData *image)
string	get_desc () const
	Get the descrition of this specific processor. More...
Public Member Functions inherited from EMAN::Processor
virtual	~Processor ()
virtual EMData *	process (const EMData *const image)
	To proccess an image out-of-place. More...
virtual void	process_list_inplace (vector< EMData * > &images)
	To process multiple images using the same algorithm. More...
virtual Dict	get_params () const
	Get the processor parameters in a key/value dictionary. More...
virtual void	set_params (const Dict &new_params)
	Set the processor parameters using a key/value dictionary. More...
virtual TypeDict	get_param_types () const
	Get processor parameter information in a dictionary. More...

Static Public Member Functions
static Processor *	NEW ()
Static Public Member Functions inherited from EMAN::Processor
static string	get_group_desc ()
	Get the description of this group of processors. More...
static void	EMFourierFilterInPlace (EMData *fimage, Dict params)
	Compute a Fourier-filter processed image in place. More...
static EMData *	EMFourierFilter (EMData *fimage, Dict params)
	Compute a Fourier-processor processed image without altering the original image. More...

Static Public Attributes
static const string	NAME = "math.rotate.180"

Additional Inherited Members
Public Types inherited from EMAN::Processor
enum	fourier_filter_types {   TOP_HAT_LOW_PASS , TOP_HAT_HIGH_PASS , TOP_HAT_BAND_PASS , TOP_HOMOMORPHIC ,   GAUSS_LOW_PASS , GAUSS_HIGH_PASS , GAUSS_BAND_PASS , GAUSS_INVERSE ,   GAUSS_HOMOMORPHIC , BUTTERWORTH_LOW_PASS , BUTTERWORTH_HIGH_PASS , BUTTERWORTH_HOMOMORPHIC ,   KAISER_I0 , KAISER_SINH , KAISER_I0_INVERSE , KAISER_SINH_INVERSE ,   SHIFT , TANH_LOW_PASS , TANH_HIGH_PASS , TANH_HOMOMORPHIC ,   TANH_BAND_PASS , RADIAL_TABLE , CTF_ }
	Fourier filter Processor type enum. More...
Protected Attributes inherited from EMAN::Processor
Dict	params

Detailed Description

Rotate by 180 using pixel swapping, works for 2D only.

Author

David Woolford

Date

July 29th 2008

Definition at line 2794 of file processor.h.

Member Function Documentation

get_desc()

string EMAN::Rotate180Processor::get_desc ( ) const

inlinevirtual

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 2811 of file processor.h.

                        {
                                return "The 2D image is rotated by 180 degree by carefully swapping image pixel values. No explicit matrix multiplication is performed. If image dimensions are even will change pixels along x=0 and y=0. Works for all combinations of even and oddness.";
                        }

get_name()

string EMAN::Rotate180Processor::get_name ( ) const

inlinevirtual

Get the processor's name.

Each processor is identified by a unique name.

Returns

The processor's name.

Implements EMAN::Processor.

Definition at line 2797 of file processor.h.

                        {
                                return NAME;
                        }

References NAME.

NEW()

static Processor * EMAN::Rotate180Processor::NEW ( )

inlinestatic

Definition at line 2801 of file processor.h.

                        {
                                return new Rotate180Processor();
                        }

process_inplace()

void Rotate180Processor::process_inplace ( EMData *  image )

virtual

Exceptions

ImageDimensionException

if the image dimensions are not 2D

Implements EMAN::Processor.

Definition at line 12137 of file processor.cpp.

                                                      {
        ENTERFUNC;
 
 
        if (image->get_ndim() != 2) {
                throw ImageDimensionException("2D only");
        }
 
#ifdef EMAN2_USING_CUDA
        if (EMData::usecuda == 1 && image->getcudarwdata()) {
                //cout << "CUDA rotate 180" << endl;
                emdata_rotate_180(image->getcudarwdata(), image->get_xsize(), image->get_ysize());
                EXITFUNC;
                return;
        }
#endif
 
        float *d = image->get_data();
        int nx = image->get_xsize();
        int ny = image->get_ysize();
 
        // x and y offsets are used to handle even vs odd cases
        int x_offset = 0;
        if (nx % 2 == 1) x_offset=1;
        int y_offset = 0;
        if (ny % 2 == 1) y_offset=1;
 
        bool stop = false;
        for (int x = 1; x <= (nx/2+x_offset); x++) {
                int y = 0;
                for (y = 1; y < (ny+y_offset); y++) {
                        if (x == (nx / 2+x_offset) && y == (ny / 2+y_offset)) {
                                stop = true;
                                break;
                        }
                        int i = (x-x_offset) + (y-y_offset) * nx;
                        int k = nx - x + (ny - y) * nx;
 
                        float t = d[i];
                        d[i] = d[k];
                        d[k] = t;
                }
                if (stop) break;
        }
 
        /* Here we guard against irregularites that occur at the boundaries
         * of even dimensioned images. The basic policy is to replace the pixel
         * in row 0 and/or column 0 with those in row 1 and/or column 1, respectively.
         * The pixel at 0,0 is replaced with the pixel at 1,1 if both image dimensions
         * are even. FIXME - it may be better to use an average at the corner, in
         * this latter case, using pixels (1,1), (0,1) and (1,0). I am not sure. (dsawoolford)
        */
        if (x_offset == 0) {
                for (int y = 0; y < ny; y++) {
                        image->set_value_at_fast(0,y,image->get_value_at(1,y));
                }
        }
 
        if (y_offset == 0) {
                for (int x = 0; x < nx; x++) {
                        image->set_value_at_fast(x,0,image->get_value_at(x,1));
                }
        }
 
        if (y_offset == 0 && x_offset == 0) {
                image->set_value_at_fast(0,0,image->get_value_at(1,1));
        }
 
        image->update();
        EXITFUNC;
}

References emdata_rotate_180(), ENTERFUNC, EXITFUNC, ImageDimensionException, x, and y.

Member Data Documentation

NAME

const string Rotate180Processor::NAME = "math.rotate.180"

static

Definition at line 2816 of file processor.h.

Referenced by get_name().

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The documentation for this class was generated from the following files:

• processor.h
• processor.cpp