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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 itkDecimateFramesVideoFilter_hxx
#define itkDecimateFramesVideoFilter_hxx
#include "itkDecimateFramesVideoFilter.h"
#include "itkImageRegionConstIterator.h"
#include "itkImageRegionIterator.h"
namespace itk
{
//
// Constructor
//
template<typename TVideoStream>
DecimateFramesVideoFilter<TVideoStream>::
DecimateFramesVideoFilter()
{
this->TemporalProcessObject::m_UnitInputNumberOfFrames = 1;
this->TemporalProcessObject::m_UnitOutputNumberOfFrames = 1;
this->TemporalProcessObject::m_InputStencilCurrentFrameIndex = 0;
// Set the frame skip amount using our SetPreservedFrameSpacing method.
// Default to move forward 2 frames every time (keep every other frame)
this->SetPreservedFrameSpacing(2);
}
//
// PrintSelf
//
template<typename TVideoStream>
void
DecimateFramesVideoFilter<TVideoStream>::
PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent
<< "NumberOfFrames: " << this->TemporalProcessObject::m_UnitInputNumberOfFrames
<< std::endl;
}
//
// SetPreservedFrameSpacing
//
template<typename TVideoStream>
void
DecimateFramesVideoFilter<TVideoStream>::
SetPreservedFrameSpacing(SizeValueType numFrames)
{
this->TemporalProcessObject::m_FrameSkipPerOutput = numFrames;
this->Modified();
}
//
// GetPreservedFrameSpacing
//
template<typename TVideoStream>
SizeValueType
DecimateFramesVideoFilter<TVideoStream>::
GetPreservedFrameSpacing()
{
return this->TemporalProcessObject::m_FrameSkipPerOutput;
}
//
// ThreadedGenerateData
//
template<typename TVideoStream>
void
DecimateFramesVideoFilter<TVideoStream>::
ThreadedGenerateData(const FrameSpatialRegionType& outputRegionForThread,
int itkNotUsed(threadId))
{
// Get the input and output video streams
const InputVideoStreamType* input = this->GetInput();
OutputVideoStreamType* output = this->GetOutput();
// Get input and output frame numbers
typename OutputVideoStreamType::TemporalRegionType outReqTempRegion =
output->GetRequestedTemporalRegion();
SizeValueType outFrameNum = outReqTempRegion.GetFrameStart();
typename InputVideoStreamType::TemporalRegionType inReqTempRegion =
input->GetRequestedTemporalRegion();
SizeValueType inFrameNum = inReqTempRegion.GetFrameStart();
// Since we want to support only returning a requested spatial region of the
// input frame, we do the pass-through the slow way using iterators rather
// than just copying memory.
// Get iterators for requested region of input and output frames
typedef ImageRegionConstIterator<FrameType> InputIterType;
typedef ImageRegionIterator<FrameType> OutputIterType;
InputIterType inIter(input->GetFrame(inFrameNum), outputRegionForThread);
OutputIterType outIter(output->GetFrame(outFrameNum), outputRegionForThread);
// Pass the values from input to output
while(!outIter.IsAtEnd())
{
// Compute the average and set the output pixel's value
outIter.Set(inIter.Get());
// Update the iterators
++outIter;
++inIter;
}
}
} // end namespace itk
#endif
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