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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 itkImageRandomSamplerSparseMask_h
#define itkImageRandomSamplerSparseMask_h
#include "itkImageRandomSamplerBase.h"
#include "itkMersenneTwisterRandomVariateGenerator.h"
#include "itkImageFullSampler.h"
namespace itk
{
/** \class ImageRandomSamplerSparseMask
*
* \brief Samples randomly some voxels of an image.
*
* This version takes into account that the mask may be very small.
* Also, it may be more efficient when very many different sample sets
* of the same input image are required, because it does some precomputation.
* \ingroup ImageSamplers
*/
template <class TInputImage>
class ITK_TEMPLATE_EXPORT ImageRandomSamplerSparseMask : public ImageRandomSamplerBase<TInputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(ImageRandomSamplerSparseMask);
/** Standard ITK-stuff. */
using Self = ImageRandomSamplerSparseMask;
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(ImageRandomSamplerSparseMask, 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;
/** The input image dimension. */
itkStaticConstMacro(InputImageDimension, unsigned int, Superclass::InputImageDimension);
/** Other typdefs. */
using InputImageIndexType = typename InputImageType::IndexType;
using InputImagePointType = typename InputImageType::PointType;
/** The random number generator used to generate random indices. */
using RandomGeneratorType = itk::Statistics::MersenneTwisterRandomVariateGenerator;
using RandomGeneratorPointer = typename RandomGeneratorType::Pointer;
protected:
using InternalFullSamplerType = itk::ImageFullSampler<InputImageType>;
using InternalFullSamplerPointer = typename InternalFullSamplerType::Pointer;
/** The constructor. */
ImageRandomSamplerSparseMask() = default;
/** The destructor. */
~ImageRandomSamplerSparseMask() override = default;
/** PrintSelf. */
void
PrintSelf(std::ostream & os, Indent indent) const override;
/** Function that does the work. */
void
GenerateData() override;
RandomGeneratorPointer m_RandomGenerator{ RandomGeneratorType::GetInstance() };
InternalFullSamplerPointer m_InternalFullSampler{ InternalFullSamplerType::New() };
private:
struct UserData
{
ITK_DISALLOW_COPY_AND_MOVE(UserData);
const std::vector<ImageSampleType> & m_AllValidSamples;
const std::vector<size_t> & m_RandomIndices;
std::vector<ImageSampleType> & m_Samples;
};
std::vector<size_t> m_RandomIndices{};
static ITK_THREAD_RETURN_FUNCTION_CALL_CONVENTION
ThreaderCallback(void * arg);
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkImageRandomSamplerSparseMask.hxx"
#endif
#endif // end #ifndef itkImageRandomSamplerSparseMask_h
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