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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 "itkTimeProbe.h"
#include "itkImageAlgorithm.h"
template <typename TImage >
static void AverageTestCopy( typename TImage::SizeType &size )
{
std::cout << "--- For image size: " << size << " ---" << std::endl;
typedef typename TImage::PixelType PixelType;
typedef TImage ImageType;
typename ImageType::RegionType region;
typename ImageType::IndexType index;
index.Fill(0);
region.SetSize(size);
region.SetIndex(index);
typename ImageType::Pointer inImage = ImageType::New();
inImage->SetRegions( region );
inImage->Allocate();
inImage->FillBuffer(12);
typename ImageType::Pointer outImage = ImageType::New();
outImage->SetRegions( region );
outImage->Allocate();
outImage->FillBuffer(12);
itk::TimeProbe t;
typedef itk::ImageRegionIterator<ImageType> ImageIterator;
for ( unsigned int i = 0; i < 10; ++i )
{
t.Start();
ImageIterator outIt( outImage, region );
ImageIterator sourceIt( inImage, region );
// walk the output region, and sample the source image
while ( !outIt.IsAtEnd() )
{
// copy the input pixel to the output
outIt.Set( sourceIt.Get() );
++outIt;
++sourceIt;
}
t.Stop();
}
std::cout << "\tIterator Copy Average Time: " << t.GetMean() << t.GetUnit() << std::endl;
itk::TimeProbe t2;
for ( unsigned int i = 0; i < 10; ++i )
{
t2.Start();
memcpy( inImage->GetBufferPointer(), outImage->GetBufferPointer(), region.GetNumberOfPixels()*sizeof( PixelType ) );
t2.Stop();
}
std::cout << "\tmemcpy Copy Average Time: " << t2.GetMean() << t2.GetUnit() << std::endl;
itk::TimeProbe t3;
for ( unsigned int i = 0; i < 10; ++i )
{
t3.Start();
itk::ImageAlgorithm::Copy( inImage.GetPointer(), outImage.GetPointer(), region, region );
t3.Stop();
}
std::cout << "\tImageCopy Average Time: " << t3.GetMean() << t3.GetUnit() << std::endl;
const double referenceTime = t.GetMean();
const double memCopyTime = t2.GetMean();
const double imageCopyTime = t3.GetMean();
std::cout << "== SUMMARY SPEEDUP RESULTS == " << std::endl;
std::cout << "memcpy is " << referenceTime/memCopyTime << " times faster" << std::endl;
std::cout << "ImageCopy is " << referenceTime/imageCopyTime << " times faster" << std::endl;
}
int itkImageAlgorithmCopyTest( int, char *[] )
{
typedef itk::Image<char, 3 > ImageType3D;
ImageType3D::SizeType size3d;
size3d.Fill( 16 );
AverageTestCopy<ImageType3D>( size3d );
size3d.Fill( 32 );
AverageTestCopy<ImageType3D>( size3d );
size3d.Fill( 64 );
AverageTestCopy<ImageType3D>( size3d );
size3d.Fill( 128 );
AverageTestCopy<ImageType3D>( size3d );
typedef itk::Image<char, 2 > ImageType2D;
ImageType2D::SizeType size2d;
size2d.Fill( 16 );
AverageTestCopy<ImageType2D>( size2d );
size2d.Fill( 32 );
AverageTestCopy<ImageType2D>( size2d );
size2d.Fill( 64 );
AverageTestCopy<ImageType2D>( size2d );
return EXIT_SUCCESS;
}
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