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/*=========================================================================
*
* Copyright UMC Utrecht and contributors
*
* 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.
*
*=========================================================================*/
#ifndef itkImageRandomCoordinateSampler_h
#define itkImageRandomCoordinateSampler_h
#include "itkImageRandomSamplerBase.h"
#include "itkInterpolateImageFunction.h"
#include "itkBSplineInterpolateImageFunction.h"
#include "itkMersenneTwisterRandomVariateGenerator.h"
namespace itk
{
/** \class ImageRandomCoordinateSampler
*
* \brief Samples an image by randomly composing a set of physical coordinates
*
* This image sampler generates not only samples that correspond with
* pixel locations, but selects points in physical space.
*
* \ingroup ImageSamplers
*/
template <class TInputImage>
class ITK_TEMPLATE_EXPORT ImageRandomCoordinateSampler : public ImageRandomSamplerBase<TInputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(ImageRandomCoordinateSampler);
/** Standard ITK-stuff. */
using Self = ImageRandomCoordinateSampler;
using Superclass = ImageRandomSamplerBase<TInputImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(ImageRandomCoordinateSampler, ImageRandomSamplerBase);
/** Typedefs inherited from the superclass. */
using typename Superclass::DataObjectPointer;
using typename Superclass::OutputVectorContainerType;
using typename Superclass::OutputVectorContainerPointer;
using typename Superclass::InputImageType;
using typename Superclass::InputImagePointer;
using typename Superclass::InputImageConstPointer;
using typename Superclass::InputImageRegionType;
using typename Superclass::InputImagePixelType;
using typename Superclass::ImageSampleType;
using typename Superclass::ImageSampleContainerType;
using typename Superclass::ImageSampleContainerPointer;
using typename Superclass::MaskType;
using typename Superclass::InputImageSizeType;
using InputImageSpacingType = typename InputImageType::SpacingType;
using typename Superclass::InputImageIndexType;
using typename Superclass::InputImagePointType;
using typename Superclass::InputImagePointValueType;
using typename Superclass::ImageSampleValueType;
/** The input image dimension. */
itkStaticConstMacro(InputImageDimension, unsigned int, Superclass::InputImageDimension);
/** This image sampler samples the image on physical coordinates and thus
* needs an interpolator. */
using CoordRepType = double;
using InterpolatorType = InterpolateImageFunction<InputImageType, CoordRepType>;
using InterpolatorPointer = typename InterpolatorType::Pointer;
using DefaultInterpolatorType = BSplineInterpolateImageFunction<InputImageType, CoordRepType, double>;
/** The random number generator used to generate random coordinates. */
using RandomGeneratorType = itk::Statistics::MersenneTwisterRandomVariateGenerator;
using RandomGeneratorPointer = typename RandomGeneratorType::Pointer;
/** Set/Get the interpolator. A 3rd order B-spline interpolator is used by default. */
itkSetObjectMacro(Interpolator, InterpolatorType);
itkGetModifiableObjectMacro(Interpolator, InterpolatorType);
/** Set/Get the sample region size (in mm). Only needed when UseRandomSampleRegion==true;
* default: filled with ones. */
itkSetMacro(SampleRegionSize, InputImageSpacingType);
itkGetConstReferenceMacro(SampleRegionSize, InputImageSpacingType);
/** Set/Get whether to use randomly selected sample regions, or just the whole image
* Default: false. */
itkGetConstMacro(UseRandomSampleRegion, bool);
itkSetMacro(UseRandomSampleRegion, bool);
protected:
using InputImageContinuousIndexType = typename InterpolatorType::ContinuousIndexType;
/** The constructor. */
ImageRandomCoordinateSampler() = default;
/** The destructor. */
~ImageRandomCoordinateSampler() override = default;
/** PrintSelf. */
void
PrintSelf(std::ostream & os, Indent indent) const override;
/** Function that does the work. */
void
GenerateData() override;
/** Generate a point randomly in a bounding box. */
virtual void
GenerateRandomCoordinate(const InputImageContinuousIndexType & smallestContIndex,
const InputImageContinuousIndexType & largestContIndex,
InputImageContinuousIndexType & randomContIndex);
InterpolatorPointer m_Interpolator = [] {
const auto interpolator = DefaultInterpolatorType::New();
interpolator->SetSplineOrder(3);
return interpolator;
}();
RandomGeneratorPointer m_RandomGenerator{ RandomGeneratorType::GetInstance() };
InputImageSpacingType m_SampleRegionSize{ itk::MakeFilled<InputImageSpacingType>(1.0) };
/** Generate the two corners of a sampling region, given the two corners
* of an image. If UseRandomSampleRegion=false, the smallesPoint and largestPoint
* are just copies of the smallestImagePoint and largestImagePoint
* Otherwise, the midpoint of the sample region is randomly selected and
* the two corners are computed using the SampleRegionSize */
virtual void
GenerateSampleRegion(const InputImageContinuousIndexType & smallestImageContIndex,
const InputImageContinuousIndexType & largestImageContIndex,
InputImageContinuousIndexType & smallestContIndex,
InputImageContinuousIndexType & largestContIndex);
private:
struct UserData
{
ITK_DISALLOW_COPY_AND_MOVE(UserData);
const std::vector<InputImageContinuousIndexType> & m_RandomCoordinates;
const InputImageType & m_InputImage;
const InterpolatorType & m_Interpolator;
std::vector<ImageSampleType> & m_Samples;
};
std::vector<InputImageContinuousIndexType> m_RandomCoordinates{};
static ITK_THREAD_RETURN_FUNCTION_CALL_CONVENTION
ThreaderCallback(void * arg);
bool m_UseRandomSampleRegion{ false };
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkImageRandomCoordinateSampler.hxx"
#endif
#endif // end #ifndef itkImageRandomCoordinateSampler_h
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