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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: ZeroCrossingBasedEdgeDetectionImageFilter.cxx
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#if defined(_MSC_VER)
#pragma warning ( disable : 4786 )
#endif
#ifdef __BORLANDC__
#define ITK_LEAN_AND_MEAN
#endif
// Software Guide : BeginCommandLineArgs
// INPUTS: {BrainProtonDensitySlice.png}
// OUTPUTS: {ZeroCrossingBasedEdgeDetectionImageFilter.png}
// 1.0 0.1
// Software Guide : EndCommandLineArgs
// Software Guide : BeginLatex
//
// The \doxygen{ZeroCrossingBasedEdgeDetectionImageFilter} performs
// edge detection by combining a sequence of Gaussian smoothing,
// Laplacian filter, and Zero cross detections on the Laplacian.
//
// \index{itk::ZeroCrossingBasedEdgeDetectionImageFilter}
//
// Software Guide : EndLatex
#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
// Software Guide : BeginLatex
//
// The header file corresponding to this filter should be included first.
//
// \index{itk::ZeroCrossingBasedEdgeDetectionImageFilter!header}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
#include "itkZeroCrossingBasedEdgeDetectionImageFilter.h"
// Software Guide : EndCodeSnippet
#include "itkRescaleIntensityImageFilter.h"
int main( int argc, char * argv[] )
{
if( argc < 5 )
{
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0] << " inputImageFile outputImageFile variance maxerror" << std::endl;
return EXIT_FAILURE;
}
// Software Guide : BeginCodeSnippet
typedef double InputPixelType;
typedef double OutputPixelType;
typedef unsigned char CharPixelType;
const unsigned int Dimension = 2;
typedef itk::Image< InputPixelType, Dimension > InputImageType;
typedef itk::Image< OutputPixelType, Dimension > OutputImageType;
typedef itk::Image< CharPixelType, Dimension > CharImageType;
// Software Guide : EndCodeSnippet
typedef itk::ImageFileReader< InputImageType > ReaderType;
typedef itk::ImageFileWriter< CharImageType > WriterType;
typedef itk::RescaleIntensityImageFilter< OutputImageType, CharImageType>
RescaleFilterType;
ReaderType::Pointer reader = ReaderType::New();
WriterType::Pointer writer = WriterType::New();
RescaleFilterType::Pointer rescaler = RescaleFilterType::New();
reader->SetFileName( argv[1] );
writer->SetFileName( argv[2] );
typedef itk::ZeroCrossingBasedEdgeDetectionImageFilter< InputImageType, OutputImageType> FilterType;
FilterType::Pointer filter = FilterType::New();
// Software Guide : BeginLatex
//
// The filter requires two parameters. First the value of the variance to be
// used by the Gaussian smoothing stage. This value is provided in the
// method \code{SetVariance} and it is given in pixel units. Second the
// filter expects the acceptable error for computing the approximation to
// the Gaussian kernel. This error is expected to be in the range between 0
// and 1. Values outside that range will result in Exceptions being thrown.
//
//
// \index{itk::ZeroCrossingBasedEdgeDetectionImageFilter!SetVariance}
// \index{itk::ZeroCrossingBasedEdgeDetectionImageFilter!SetMaximumError}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
filter->SetVariance( atof( argv[3] ) );
filter->SetMaximumError( atof( argv[4] ) );
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// As with most filters, we connect the input and output of this
// filter in order to create a pipeline. In this particular case the
// input is taken from a reader and the output is sent to a writer.
// Given that the zero crossing filter is producing a float image as
// output, we use a \doxygen{RescaleIntensityImageFilter} to convert
// this image to an eight bits image before sending it to the writer.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
filter->SetInput( reader->GetOutput() );
rescaler->SetInput( filter->GetOutput() );
writer->SetInput( rescaler->GetOutput() );
// Software Guide : EndCodeSnippet
rescaler->SetOutputMinimum( 0 );
rescaler->SetOutputMaximum( 255 );
try
{
writer->Update();
}
catch( itk::ExceptionObject & excp )
{
std::cerr << excp << std::endl;
}
return EXIT_SUCCESS;
}
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