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EMAN::AddNoiseProcessor Class Reference

add noise to an image More...

#include <processor.h>

Inheritance diagram for EMAN::AddNoiseProcessor:

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Collaboration diagram for EMAN::AddNoiseProcessor:

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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 TypeDict get_param_types () const
 Get processor parameter information in a dictionary.
virtual string get_desc () const
 Get the descrition of this specific processor.

Static Public Member Functions

ProcessorNEW ()

Static Public Attributes

const string NAME = "math.addnoise"

Protected Member Functions

virtual float get_sigma (EMData *)

Detailed Description

add noise to an image

Parameters:
noise noise factor used to generate Gaussian distribution random noise
seed seed for random number generator

Definition at line 4566 of file processor.h.


Member Function Documentation

virtual string EMAN::AddNoiseProcessor::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.

Reimplemented in EMAN::AddSigmaNoiseProcessor.

Definition at line 4589 of file processor.h.

04590                 {
04591                         return "add noise to an image, image multiply by noise then add a random value";
04592                 }

virtual string EMAN::AddNoiseProcessor::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.

Reimplemented in EMAN::AddSigmaNoiseProcessor.

Definition at line 4571 of file processor.h.

04572                 {
04573                         return NAME;
04574                 }

virtual TypeDict EMAN::AddNoiseProcessor::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.

Returns:
A dictionary containing the parameter info.

Reimplemented from EMAN::Processor.

Definition at line 4581 of file processor.h.

References EMAN::TypeDict::put().

04582                 {
04583                         TypeDict d;
04584                         d.put("noise", EMObject::FLOAT, "noise factor used to generate Gaussian distribution random noise");
04585                         d.put("seed", EMObject::INT, "seed for random number generator");
04586                         return d;
04587                 }

virtual float EMAN::AddNoiseProcessor::get_sigma EMData  )  [inline, protected, virtual]
 

Reimplemented in EMAN::AddSigmaNoiseProcessor.

Definition at line 4597 of file processor.h.

Referenced by process_inplace().

04598                 {
04599                         return 1.0;
04600                 }

Processor* EMAN::AddNoiseProcessor::NEW  )  [inline, static]
 

Reimplemented in EMAN::AddSigmaNoiseProcessor.

Definition at line 4576 of file processor.h.

04577                 {
04578                         return new AddNoiseProcessor();
04579                 }

void AddNoiseProcessor::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 4398 of file processor.cpp.

References EMAN::EMData::get_data(), EMAN::Randnum::get_gauss_rand(), get_sigma(), EMAN::EMData::get_size(), EMAN::Dict::has_key(), EMAN::Randnum::Instance(), LOGWARN, EMAN::Randnum::set_seed(), and EMAN::EMData::update().

04399 {
04400         if (!image) {
04401                 LOGWARN("NULL Image");
04402                 return;
04403         }
04404 
04405         Randnum * randnum = Randnum::Instance();
04406         if(params.has_key("seed")) {
04407                 randnum->set_seed((int)params["seed"]);
04408         }
04409 
04410         float addnoise = params["noise"];
04411         addnoise *= get_sigma(image);
04412         float *dat = image->get_data();
04413 
04414         for (size_t j = 0; j < image->get_size(); ++j) {
04415                 dat[j] += randnum->get_gauss_rand(addnoise, addnoise / 2);
04416         }
04417 
04418         image->update();
04419 }


Member Data Documentation

const string AddNoiseProcessor::NAME = "math.addnoise" [static]
 

Reimplemented in EMAN::AddSigmaNoiseProcessor.

Definition at line 164 of file processor.cpp.


The documentation for this class was generated from the following files:
Generated on Tue Jul 12 13:52:22 2011 for EMAN2 by  doxygen 1.3.9.1