WeightedAverageFilter.cpp

/*
GRT MIT License
Copyright (c) <2012> <Nicholas Gillian, Media Lab, MIT>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software
and associated documentation files (the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial
portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#define GRT_DLL_EXPORTS
#include "WeightedAverageFilter.h"

GRT_BEGIN_NAMESPACE

//Define the string that will be used to identify the object
const std::string WeightedAverageFilter::id = "WeightedAverageFilter";
std::string WeightedAverageFilter::getId() { return WeightedAverageFilter::id; }

//Register the WeightedAverageFilter module with the PreProcessing base class
RegisterPreProcessingModule< WeightedAverageFilter > WeightedAverageFilter::registerModule( WeightedAverageFilter::getId() );

WeightedAverageFilter::WeightedAverageFilter(const UINT filterSize,const UINT numDimensions) : PreProcessing( WeightedAverageFilter::getId() )
{
 init(filterSize,numDimensions);
}

WeightedAverageFilter::WeightedAverageFilter(const WeightedAverageFilter &rhs) : PreProcessing( WeightedAverageFilter::getId() )
{ 
 //Zero this instance
 this->filterSize = 0;
 this->inputSampleCounter = 0;
 
 //Copy the settings from the rhs instance
 *this = rhs;
}

WeightedAverageFilter::~WeightedAverageFilter(){
 
}

WeightedAverageFilter& WeightedAverageFilter::operator=(const WeightedAverageFilter &rhs){
 if(this!=&rhs){
 //Clear this instance
 this->filterSize = 0;
 this->inputSampleCounter = 0;
 this->dataBuffer.clear();
 this->weights = rhs.weights;
 
 //Copy from the rhs instance
 if( rhs.initialized ){
 this->init( rhs.filterSize, rhs.numInputDimensions );
 this->dataBuffer = rhs.dataBuffer;
 }
 
 //Copy the preprocessing base variables
 copyBaseVariables( (PreProcessing*)&rhs );
 }
 return *this;
}

bool WeightedAverageFilter::deepCopyFrom(const PreProcessing *preProcessing){
 
 if( preProcessing == NULL ) return false;
 
 if( this->getId() == preProcessing->getId() ){
 
 //Call the equals operator
 *this = *dynamic_cast<const WeightedAverageFilter*>(preProcessing);
 
 return true;
 }
 
 errorLog << "deepCopyFrom(const PreProcessing *preProcessing) - PreProcessing Types Do Not Match!" << std::endl;
 
 return false;
}


bool WeightedAverageFilter::process(const VectorFloat &inputVector){
 
 if( !initialized ){
 errorLog << "process(const VectorFloat &inputVector) - The filter has not been initialized!" << std::endl;
 return false;
 }
 
 if( inputVector.size() != numInputDimensions ){
 errorLog << "process(const VectorFloat &inputVector) - The size of the inputVector (" << inputVector.size() << ") does not match that of the filter (" << numInputDimensions << ")!" << std::endl;
 return false;
 }
 
 filter( inputVector );
 
 if( processedData.size() == numOutputDimensions ) return true;
 
 return false;
}

bool WeightedAverageFilter::reset(){
 if( initialized ) return init(filterSize,numInputDimensions);
 return false;
}

bool WeightedAverageFilter::save( std::fstream &file ) const{
 
 if( !file.is_open() ){
 errorLog << "save(fstream &file) - The file is not open!" << std::endl;
 return false;
 }
 
 file << "GRT_WEIGHTED_AVERAGE_FILTER_FILE_V1.0" << std::endl;
 
 file << "NumInputDimensions: " << numInputDimensions << std::endl;
 file << "NumOutputDimensions: " << numOutputDimensions << std::endl;
 file << "FilterSize: " << filterSize << std::endl;
 
 return true;
}

bool WeightedAverageFilter::load( std::fstream &file ){
 
 if( !file.is_open() ){
 errorLog << "load(fstream &file) - The file is not open!" << std::endl;
 return false;
 }
 
 std::string word;
 
 //Load the header
 file >> word;
 
 if( word != "GRT_WEIGHTED_AVERAGE_FILTER_FILE_V1.0" ){
 errorLog << "load(fstream &file) - Invalid file format!" << std::endl;
 return false;
 }
 
 //Load the number of input dimensions
 file >> word;
 if( word != "NumInputDimensions:" ){
 errorLog << "load(fstream &file) - Failed to read NumInputDimensions header!" << std::endl;
 return false;
 }
 file >> numInputDimensions;
 
 //Load the number of output dimensions
 file >> word;
 if( word != "NumOutputDimensions:" ){
 errorLog << "load(fstream &file) - Failed to read NumOutputDimensions header!" << std::endl;
 return false;
 }
 file >> numOutputDimensions;
 
 //Load the filter factor
 file >> word;
 if( word != "FilterSize:" ){
 errorLog << "load(fstream &file) - Failed to read FilterSize header!" << std::endl;
 return false;
 }
 file >> filterSize;
 
 //Init the filter module to ensure everything is initialized correctly
 return init(filterSize,numInputDimensions);
}

bool WeightedAverageFilter::init(const UINT filterSize,const UINT numDimensions){
 
 //Cleanup the old memory
 initialized = false;
 inputSampleCounter = 0;
 
 if( filterSize == 0 ){
 errorLog << "init(UINT filterSize,UINT numDimensions) - Filter size can not be zero!" << std::endl;
 return false;
 }
 
 if( numDimensions == 0 ){
 errorLog << "init(UINT filterSize,UINT numDimensions) - The number of dimensions must be greater than zero!" << std::endl;
 return false;
 }
 
 //Resize the filter
 this->filterSize = filterSize;
 this->numInputDimensions = numDimensions;
 this->numOutputDimensions = numDimensions;
 processedData.clear();
 weights.clear();
 processedData.resize(numDimensions,0);
 weights.resize(filterSize);
 initialized = dataBuffer.resize( filterSize, VectorFloat(numInputDimensions,0) );
 
 const Float norm = 1.0 / filterSize;
 for(UINT i=0; i<filterSize; i++){
 weights[i] = (i+1)*norm;
 }
 
 if( !initialized ){
 errorLog << "init(UINT filterSize,UINT numDimensions) - Failed to resize dataBuffer!" << std::endl;
 }
 
 return initialized;
}

Float WeightedAverageFilter::filter(const Float x){
 
 //If the filter has not been initialised then return 0, otherwise filter x and return y
 if( !initialized ){
 errorLog << "filter(const Float x) - The filter has not been initialized!" << std::endl;
 return 0;
 }
 
 VectorFloat y = filter(VectorFloat(1,x));
 
 if( y.size() == 0 ) return 0;
 return y[0];
}

VectorFloat WeightedAverageFilter::filter(const VectorFloat &x){
 
 //If the filter has not been initialised then return 0, otherwise filter x and return y
 if( !initialized ){
 errorLog << "filter(const VectorFloat &x) - The filter has not been initialized!" << std::endl;
 return VectorFloat();
 }
 
 if( x.size() != numInputDimensions ){
 errorLog << "filter(const VectorFloat &x) - The size of the input vector (" << x.size() << ") does not match that of the number of dimensions of the filter (" << numInputDimensions << ")!" << std::endl;
 return VectorFloat();
 }
 
 if( ++inputSampleCounter > filterSize ) inputSampleCounter = filterSize;
 
 //Add the new value to the buffer
 dataBuffer.push_back( x );
 
 Float weightSum = 0;
 for(unsigned int j=0; j<numInputDimensions; j++){
 processedData[j] = 0;
 weightSum = 0;
 for(unsigned int i=0; i<inputSampleCounter; i++) {
 processedData[j] += dataBuffer[i][j] * weights[i];
 weightSum += weights[i];
 }
 if( weightSum != 0.0 ) processedData[j] /= weightSum;
 }
 
 return processedData;
}

UINT WeightedAverageFilter::getFilterSize() const { return filterSize; }
 
VectorFloat WeightedAverageFilter::getFilteredData() const { return processedData; }

GRT_END_NAMESPACE