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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#include "itkAntiAliasBinaryImageFilter.h"
#include "itkTestingMacros.h"
#include "itkImageFileWriter.h"
//
// This is a simple test of the AntiAliasBinaryImageFilter class. It creates a
// binary image of a sphere, then applies the filter. If you want to view the
// output, uncomment the lines which write the binary file. Output will be the
// floating point distance transform from the surface, which can be directly
// rendered using Marching Cubes or some other suitable algorithm. See
// documentation for AntiAliasBinaryImageFilter and
// SparseFieldLevelSetImageFilter for more information.
//
namespace AntiAliasBinaryImageFilterTestNamespace {
const int V_WIDTH = 64;
const int V_HEIGHT = 64;
const int V_DEPTH = 64;
float sphere(float x, float y, float z)
{
float dis;
dis = (x - (float)V_WIDTH/2.0)*(x - (float)V_WIDTH/2.0)
/((0.2f*V_WIDTH)*(0.2f*V_WIDTH)) +
(y - (float)V_HEIGHT/2.0)*(y - (float)V_HEIGHT/2.0)
/((0.2f*V_HEIGHT)*(0.2f*V_HEIGHT)) +
(z - (float)V_DEPTH/2.0)*(z - (float)V_DEPTH/2.0)
/((0.2f*V_DEPTH)*(0.2f*V_DEPTH));
return(1.0f-dis);
}
void evaluate_function(itk::Image<char, 3> *im,
float (*f)(float, float, float) )
{
itk::Image<char, 3>::IndexType idx;
for(int z = 0; z < V_DEPTH; ++z)
{
idx[2] = z;
for (int y = 0; y < V_HEIGHT; ++y)
{
idx[1] = y;
for (int x = 0; x < V_WIDTH; ++x)
{
idx[0] = x;
if ( f((float)x,(float)y,(float)z) >= 0.0 )
{ im->SetPixel(idx, 1 ); }
else
{ im->SetPixel(idx, 0 ); }
}
}
}
}
} // end namespace
int itkAntiAliasBinaryImageFilterTest(int argc, char * argv [] )
{
if( argc < 2 )
{
std::cerr << "Missing arguments." << std::endl;
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0] << " outputImage " << std::endl;
return EXIT_FAILURE;
}
const char * outputImage = argv[1];
typedef char InputDataType;
typedef itk::Image<InputDataType, 3> BinaryImageType;
typedef itk::Image<float, 3> RealImageType;
itk::AntiAliasBinaryImageFilter<BinaryImageType, RealImageType>::Pointer
antialiaser = itk::AntiAliasBinaryImageFilter<BinaryImageType, RealImageType>::New();
// Create a binary image of a sphere.
BinaryImageType::Pointer image = BinaryImageType::New();
BinaryImageType::RegionType region;
BinaryImageType::RegionType::SizeType sz;
BinaryImageType::RegionType::IndexType idx;
for (unsigned k = 0; k < 3; k++)
{
sz[k] = 64;
idx[k] = 0;
}
region.SetSize(sz);
region.SetIndex(idx);
image->SetRegions(region);
image->Allocate();
AntiAliasBinaryImageFilterTestNamespace::evaluate_function(image,
AntiAliasBinaryImageFilterTestNamespace::sphere);
// Set up and apply the filter.
antialiaser->SetInput(image);
antialiaser->SetMaximumRMSError(0.02);
// For increased code coverage. Does nothing.
antialiaser->GetMaximumRMSError();
// Generally a good idea to set this value as a safeguard against infinte
// loops if the MaximumRMSError has been set too low.
antialiaser->SetNumberOfIterations(100);
TRY_EXPECT_NO_EXCEPTION( antialiaser->Update() );
std::cout << "Maximum RMS change value threshold was: 0.02 " << std::endl;
std::cout << "Last RMS change value was: " << antialiaser->GetRMSChange() << std::endl;
if( antialiaser->GetRMSChange() > 0.02 )
{
std::cerr << "Unexpected RMSChange." << std::endl;
return EXIT_FAILURE;
}
if (antialiaser->GetElapsedIterations() >= 100)
{
std::cout << "ERROR: Filter did not converge.";
return EXIT_FAILURE;
}
else
{
typedef itk::ImageFileWriter<RealImageType> WriterType;
WriterType::Pointer writer = WriterType::New();
writer->SetInput( antialiaser->GetOutput() );
writer->SetFileName( outputImage );
TRY_EXPECT_NO_EXCEPTION( writer->Update() );
// Repeat just to make sure we reinitialize properly.
antialiaser->SetNumberOfIterations(200);
antialiaser->Update();
antialiaser->GetLowerBinaryValue();
antialiaser->GetUpperBinaryValue();
std::cout << "Maximum RMS change value threshold was: 0.02 " << std::endl;
std::cout << "Last RMS change value was: " << antialiaser->GetRMSChange() << std::endl;
if( antialiaser->GetRMSChange() > 0.02 )
{
std::cerr << "Unexpected RMSChange." << std::endl;
return EXIT_FAILURE;
}
}
return EXIT_SUCCESS;
}
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