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include
itkHistogramToEntropyImageFilter.h
Go to the documentation of this file.
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/*=========================================================================
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*
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* Copyright Insight Software Consortium
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0.txt
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*=========================================================================*/
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#ifndef __itkHistogramToEntropyImageFilter_h
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#define __itkHistogramToEntropyImageFilter_h
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#include "
itkHistogramToImageFilter.h
"
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namespace
itk
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{
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namespace
Function
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{
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template
<
class
TInput,
class
TOutput =
double
>
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class
HistogramEntropyFunction
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{
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public
:
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//Probability function = Number of occurrences in each bin /
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// Total Number of occurrences.
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//
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// Returns pixels of float..
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typedef
TOutput
OutputPixelType
;
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HistogramEntropyFunction
():
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m_TotalFrequency
(1) {}
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~HistogramEntropyFunction
() {}
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inline
OutputPixelType
operator()
(
const
TInput & A)
const
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{
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if
( A )
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{
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const
double
p =
static_cast<
OutputPixelType
>
( A )
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/ static_cast< OutputPixelType >(
m_TotalFrequency
);
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return
static_cast<
OutputPixelType
>
( ( -1 ) * p * vcl_log(p) / vcl_log(2.0) );
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}
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else
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{
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const
double
p =
static_cast<
OutputPixelType
>
( A + 1 )
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/ static_cast< OutputPixelType >(
m_TotalFrequency
);
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return
static_cast<
OutputPixelType
>
( ( -1 ) * p * vcl_log(p) / vcl_log(2.0) );
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}
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}
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void
SetTotalFrequency
(
const
SizeValueType
n)
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{
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m_TotalFrequency
= n;
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}
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SizeValueType
GetTotalFrequency
()
const
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{
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return
m_TotalFrequency
;
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}
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private
:
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SizeValueType
m_TotalFrequency
;
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};
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}
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template
<
class
THistogram,
class
TImage=Image<
double
, 3> >
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class
ITK_EXPORT
HistogramToEntropyImageFilter
:
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public
HistogramToImageFilter
< THistogram, TImage,
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Function::HistogramEntropyFunction< SizeValueType, typename TImage::PixelType > >
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{
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public
:
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typedef
HistogramToEntropyImageFilter
Self
;
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typedef
HistogramToImageFilter
< THistogram, TImage,
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Function::HistogramEntropyFunction< SizeValueType, typename TImage::PixelType >
>
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Superclass
;
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typedef
SmartPointer< Self >
Pointer
;
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typedef
SmartPointer< const Self >
ConstPointer
;
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itkTypeMacro(
HistogramToEntropyImageFilter
,
HistogramToImageFilter
);
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itkNewMacro(
Self
);
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protected
:
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HistogramToEntropyImageFilter
() {}
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virtual
~HistogramToEntropyImageFilter
() {}
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private
:
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HistogramToEntropyImageFilter
(
const
Self &);
//purposely not implemented
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void
operator=(
const
Self &);
//purposely not implemented
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};
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}
// end namespace itk
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#endif
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