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| This example demonstrates a simple multi-threaded filter, creating the effect of oil painting. You can also use this class as-is (copy .h and .txx files into your project and use them).
| | {{warning|1=The media wiki content on this page is no longer maintained. The examples presented on the https://itk.org/Wiki/* pages likely require ITK version 4.13 or earlier releases. In many cases, the examples on this page no longer conform to the best practices for modern ITK versions.}} |
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| ==ImageFilterExample.cxx==
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| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkImageFileReader.h"
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| #include "itkImageFileWriter.h"
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|
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| #include "itkOilPaintingImageFilter.h"
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|
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| int main(int, char*[])
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| { | |
| typedef itk::Image<unsigned char, 2> ImageType;
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| typedef itk::OilPaintingImageFilter<ImageType> FilterType;
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|
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| typedef itk::ImageFileReader<ImageType> ReaderType;
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| ReaderType::Pointer reader = ReaderType::New();
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| reader->SetFileName("LenaGrayscale.jpg");
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| reader->Update();
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|
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| FilterType::Pointer filter = FilterType::New();
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| filter->SetInput(reader->GetOutput());
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| filter->SetNumberOfBins(50);
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| filter->SetRadius(2);
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| filter->Update();
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|
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| typedef itk::ImageFileWriter< ImageType > WriterType;
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| WriterType::Pointer writer = WriterType::New();
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| writer->SetFileName("LenaOil.jpg");
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| writer->SetInput(filter->GetOutput());
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| writer->Update();
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|
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| return EXIT_SUCCESS;
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| }
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| </source>
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| | |
| ==itkOilPaintingImageFilter.h==
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| <source lang="cpp">
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| #ifndef __itkOilPaintingImageFilter_h
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| #define __itkOilPaintingImageFilter_h
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|
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| #include "itkImageToImageFilter.h"
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| #include "itkNeighborhoodIterator.h"
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|
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| namespace itk
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| {
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| /** \class OilPaintingImageFilter
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| * \brief Implements oil painting artistic image filter.
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| *
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| * Default number of bins is 20.
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| * Default radius is 5, meaning a window of 11x11x11 for 3D images. | |
| *
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| * \ingroup ImageFilters
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| */
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| template< class TImage>
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| class OilPaintingImageFilter:public ImageToImageFilter< TImage, TImage >
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| {
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| public:
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| /** Standard class typedefs. */
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| typedef OilPaintingImageFilter Self;
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| typedef ImageToImageFilter< TImage, TImage > Superclass;
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| typedef SmartPointer< Self > Pointer;
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| typedef typename NeighborhoodIterator<TImage>::RadiusType RadiusType;
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|
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| /** Method for creation through the object factory. */
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| itkNewMacro(Self);
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|
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| /** Run-time type information (and related methods). */
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| itkTypeMacro(OilPaintingImageFilter, ImageToImageFilter);
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| itkSetMacro(NumberOfBins, unsigned int);
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| itkGetConstMacro(NumberOfBins, const unsigned int);
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|
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| itkSetMacro(Radius, RadiusType);
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| itkGetConstMacro(Radius, const RadiusType);
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| void SetRadius(unsigned int radius);
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|
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| protected:
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| OilPaintingImageFilter();
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| ~OilPaintingImageFilter(){}
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|
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| virtual void BeforeThreadedGenerateData();
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|
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| /** Does the real work. */
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| virtual void ThreadedGenerateData(const typename Superclass::OutputImageRegionType& outputRegionForThread, int threadId);
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|
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| private:
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| OilPaintingImageFilter(const Self &); //purposely not implemented
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| void operator=(const Self &); //purposely not implemented
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|
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| typename TImage::ValueType m_Maximum, m_Minimum;
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| typename NeighborhoodIterator<TImage>::RadiusType m_Radius;
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| unsigned int m_NumberOfBins;
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| };
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| } //namespace ITK
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|
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|
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| #ifndef ITK_MANUAL_INSTANTIATION
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| #include "itkOilPaintingImageFilter.txx"
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| #endif
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|
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| #endif // __itkOilPaintingImageFilter_h
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| </source>
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| | |
| ==itkOilPaintingImageFilter.txx==
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| <source lang="cpp">
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| #ifndef __itkOilPaintingImageFilter_txx
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| #define __itkOilPaintingImageFilter_txx
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|
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| #include "itkOilPaintingImageFilter.h"
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| #include "itkObjectFactory.h"
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| #include "itkImageRegionIterator.h"
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| #include "itkImageRegionConstIterator.h"
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| #include "itkNeighborhoodIterator.h"
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| #include "itkMinimumMaximumImageCalculator.h"
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|
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| namespace itk
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| {
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| template<class TImage>
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| OilPaintingImageFilter<TImage>::OilPaintingImageFilter()
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| {
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| m_NumberOfBins=20;
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| SetRadius(5);
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| }
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|
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| template<class TImage>
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| void OilPaintingImageFilter<TImage>::SetRadius(unsigned int radius)
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| {
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| for (unsigned int i = 0; i < TImage::ImageDimension; ++i)
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| m_Radius[i] = radius;
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| }
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|
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| template<class TImage>
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| void OilPaintingImageFilter<TImage>::BeforeThreadedGenerateData()
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| {
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| typedef itk::MinimumMaximumImageCalculator< TImage > CalculatorType;
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| typename CalculatorType::Pointer calculatorI = CalculatorType::New();
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| calculatorI->SetImage( this->GetInput() );
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| calculatorI->Compute();
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| m_Maximum = calculatorI->GetMaximum();
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| m_Minimum = calculatorI->GetMinimum();
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| }
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|
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| template<class TImage>
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| void OilPaintingImageFilter<TImage>
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| ::ThreadedGenerateData(const typename Superclass::OutputImageRegionType& outputRegionForThread, int threadId)
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| {
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| typename TImage::ConstPointer input = this->GetInput(); | |
| typename TImage::Pointer output = this->GetOutput();
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|
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| itk::ImageRegionIterator<TImage> out(output, outputRegionForThread);
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| itk::ConstNeighborhoodIterator<TImage> it(m_Radius, input, outputRegionForThread);
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|
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| unsigned long long *bins=new unsigned long long[m_NumberOfBins];
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|
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| while(!out.IsAtEnd())
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| {
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| for (unsigned int i=0; i<m_NumberOfBins; i++)
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| bins[i]=0; //reset histogram
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|
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| //create histogram of values within the radius
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| for (unsigned int i = 0; i < it.Size(); ++i)
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| {
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| typename TImage::ValueType val=it.GetPixel(i);
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| bins[int((m_NumberOfBins-0.001)*(val-m_Minimum)/(m_Maximum-m_Minimum))]++;
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| //casting to int rounds towards zero
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| //without -0.001, when val=max then we would go over the upper bound (index m_NumberOfBins)
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| }
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|
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| //find the peak
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| unsigned maxIndex=0;
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| unsigned long long maxBin=bins[0];
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| for (unsigned int i=1; i<m_NumberOfBins; i++)
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| if (bins[i]>maxBin)
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| {
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| maxBin=bins[i];
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| maxIndex=i;
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| }
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|
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| //set middle value of a bin's range as intensity
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| out.Set((maxIndex+0.5)*(m_Maximum-m_Minimum)/m_NumberOfBins);
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|
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| ++it;
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| ++out;
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| }
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|
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| delete bins; //dealloc array
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| }
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|
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| }// end namespace
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|
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| #endif //__itkOilPaintingImageFilter_txx
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| </source>
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| {{ITKCMakeLists|ImageFilterExample}}
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