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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.
*
*=========================================================================*/
#ifndef itkOtsuThresholdImageCalculator_h
#define itkOtsuThresholdImageCalculator_h
#include "itkObject.h"
#include "itkObjectFactory.h"
#include "itkNumericTraits.h"
#include "itkIntTypes.h"
#ifndef ITKV3_COMPATIBILITY
#error "This file is only valid when ITKV3_COMPATIBILITY is turned on. Users are encouraged to convert to itk::OtsuThresholdCalculator in ITKv4"
#endif
namespace itk
{
/** \class OtsuThresholdImageCalculator
* \brief Computes the Otsu's threshold for an image.
*
* This calculator computes the Otsu's threshold which separates an image
* into foreground and background components. The method relies on a
* histogram of image intensities. The basic idea is to maximize the
* between-class variance.
*
* This class is templated over the input image type.
*
* \warning This method assumes that the input image consists of scalar pixel
* types.
*
* \deprecated
* \ingroup Operators
* \ingroup ITKThresholding
* \ingroup ITKV3Compatibility
*/
template< typename TInputImage >
class ITK_TEMPLATE_EXPORT OtsuThresholdImageCalculator:public Object
{
public:
/** Standard class typedefs. */
typedef OtsuThresholdImageCalculator Self;
typedef Object Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(OtsuThresholdImageCalculator, Object);
/** Type definition for the input image. */
typedef TInputImage ImageType;
/** Pointer type for the image. */
typedef typename TInputImage::Pointer ImagePointer;
/** Const Pointer type for the image. */
typedef typename TInputImage::ConstPointer ImageConstPointer;
/** Type definition for the input image pixel type. */
typedef typename TInputImage::PixelType PixelType;
/** Type definition for the input image region type. */
typedef typename TInputImage::RegionType RegionType;
/** Set the input image. */
itkSetConstObjectMacro(Image, ImageType);
/** Compute the Otsu's threshold for the input image. */
void Compute();
/** Return the Otsu's threshold value. */
itkGetConstMacro(Threshold, PixelType);
/** Set/Get the number of histogram bins. Default is 128. */
itkSetClampMacro( NumberOfHistogramBins, SizeValueType, 1,
NumericTraits< SizeValueType >::max() );
itkGetConstMacro(NumberOfHistogramBins, SizeValueType);
/** Set the region over which the values will be computed */
void SetRegion(const RegionType & region);
protected:
OtsuThresholdImageCalculator();
virtual ~OtsuThresholdImageCalculator() {}
virtual void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
private:
ITK_DISALLOW_COPY_AND_ASSIGN(OtsuThresholdImageCalculator);
PixelType m_Threshold;
SizeValueType m_NumberOfHistogramBins;
ImageConstPointer m_Image;
RegionType m_Region;
bool m_RegionSetByUser;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkOtsuThresholdImageCalculator.hxx"
#endif
#endif
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