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vtkImageGradientMagnitude.cxx
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vtkImageGradientMagnitude.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkImageGradientMagnitude.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkImageGradientMagnitude.h"
#include "vtkDataArray.h"
#include "vtkImageData.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include <cmath>
vtkStandardNewMacro(vtkImageGradientMagnitude);
//------------------------------------------------------------------------------
// Construct an instance of vtkImageGradientMagnitude filter.
vtkImageGradientMagnitude::vtkImageGradientMagnitude()
{
this->SetNumberOfInputPorts(1);
this->SetNumberOfOutputPorts(1);
this->Dimensionality = 2;
this->HandleBoundaries = 1;
}
//------------------------------------------------------------------------------
void vtkImageGradientMagnitude::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "HandleBoundaries: " << this->HandleBoundaries << "\n";
os << indent << "Dimensionality: " << this->Dimensionality << "\n";
}
//------------------------------------------------------------------------------
// This method is passed a region that holds the image extent of this filters
// input, and changes the region to hold the image extent of this filters
// output.
int vtkImageGradientMagnitude::RequestInformation(vtkInformation* vtkNotUsed(request),
vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
int extent[6];
int idx;
// get the info objects
vtkInformation* outInfo = outputVector->GetInformationObject(0);
vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);
// invalid setting, it has not been set, so default to whole Extent
inInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(), extent);
if (!this->HandleBoundaries)
{
// shrink output image extent.
for (idx = 0; idx < this->Dimensionality; ++idx)
{
extent[idx * 2] += 1;
extent[idx * 2 + 1] -= 1;
}
}
outInfo->Set(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(), extent, 6);
return 1;
}
//------------------------------------------------------------------------------
// This method computes the input extent necessary to generate the output.
int vtkImageGradientMagnitude::RequestUpdateExtent(vtkInformation* vtkNotUsed(request),
vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
int wholeExtent[6];
int idx;
// get the info objects
vtkInformation* outInfo = outputVector->GetInformationObject(0);
vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);
// invalid setting, it has not been set, so default to whole Extent
inInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(), wholeExtent);
int inUExt[6];
outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT(), inUExt);
// grow input whole extent.
for (idx = 0; idx < this->Dimensionality; ++idx)
{
inUExt[idx * 2] -= 1;
inUExt[idx * 2 + 1] += 1;
if (this->HandleBoundaries)
{
// we must clip extent with whole extent is we handle boundaries.
if (inUExt[idx * 2] < wholeExtent[idx * 2])
{
inUExt[idx * 2] = wholeExtent[idx * 2];
}
if (inUExt[idx * 2 + 1] > wholeExtent[idx * 2 + 1])
{
inUExt[idx * 2 + 1] = wholeExtent[idx * 2 + 1];
}
}
}
inInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT(), inUExt, 6);
return 1;
}
//------------------------------------------------------------------------------
// This execute method handles boundaries.
// it handles boundaries. Pixels are just replicated to get values
// out of extent.
template <class T>
void vtkImageGradientMagnitudeExecute(vtkImageGradientMagnitude* self, vtkImageData* inData,
T* inPtr, vtkImageData* outData, T* outPtr, int outExt[6], int id)
{
int idxC, idxX, idxY, idxZ;
int maxC, maxX, maxY, maxZ;
vtkIdType inIncX, inIncY, inIncZ;
vtkIdType outIncX, outIncY, outIncZ;
unsigned long count = 0;
unsigned long target;
int axesNum;
int* wholeExtent;
vtkIdType inIncs[3];
double r[3], d, sum;
int useZMin, useZMax, useYMin, useYMax, useXMin, useXMax;
int* inExt = inData->GetExtent();
// find the region to loop over
maxC = outData->GetNumberOfScalarComponents();
maxX = outExt[1] - outExt[0];
maxY = outExt[3] - outExt[2];
maxZ = outExt[5] - outExt[4];
target = static_cast<unsigned long>((maxZ + 1) * (maxY + 1) / 50.0);
target++;
// Get the dimensionality of the gradient.
axesNum = self->GetDimensionality();
// Get increments to march through data
inData->GetContinuousIncrements(outExt, inIncX, inIncY, inIncZ);
outData->GetContinuousIncrements(outExt, outIncX, outIncY, outIncZ);
// The data spacing is important for computing the gradient.
inData->GetSpacing(r);
r[0] = 0.5 / r[0];
r[1] = 0.5 / r[1];
r[2] = 0.5 / r[2];
// get some other info we need
inData->GetIncrements(inIncs);
wholeExtent = inData->GetExtent();
// Move the starting pointer to the correct location.
inPtr += (outExt[0] - inExt[0]) * inIncs[0] + (outExt[2] - inExt[2]) * inIncs[1] +
(outExt[4] - inExt[4]) * inIncs[2];
// Loop through output pixels
for (idxZ = 0; idxZ <= maxZ; idxZ++)
{
useZMin = ((idxZ + outExt[4]) <= wholeExtent[4]) ? 0 : -inIncs[2];
useZMax = ((idxZ + outExt[4]) >= wholeExtent[5]) ? 0 : inIncs[2];
for (idxY = 0; !self->AbortExecute && idxY <= maxY; idxY++)
{
if (!id)
{
if (!(count % target))
{
self->UpdateProgress(count / (50.0 * target));
}
count++;
}
useYMin = ((idxY + outExt[2]) <= wholeExtent[2]) ? 0 : -inIncs[1];
useYMax = ((idxY + outExt[2]) >= wholeExtent[3]) ? 0 : inIncs[1];
for (idxX = 0; idxX <= maxX; idxX++)
{
useXMin = ((idxX + outExt[0]) <= wholeExtent[0]) ? 0 : -inIncs[0];
useXMax = ((idxX + outExt[0]) >= wholeExtent[1]) ? 0 : inIncs[0];
for (idxC = 0; idxC < maxC; idxC++)
{
// do X axis
d = static_cast<double>(inPtr[useXMin]);
d -= static_cast<double>(inPtr[useXMax]);
d *= r[0]; // multiply by the data spacing
sum = d * d;
// do y axis
d = static_cast<double>(inPtr[useYMin]);
d -= static_cast<double>(inPtr[useYMax]);
d *= r[1]; // multiply by the data spacing
sum += (d * d);
if (axesNum == 3)
{
// do z axis
d = static_cast<double>(inPtr[useZMin]);
d -= static_cast<double>(inPtr[useZMax]);
d *= r[2]; // multiply by the data spacing
sum += (d * d);
}
*outPtr = static_cast<T>(sqrt(sum));
outPtr++;
inPtr++;
}
}
outPtr += outIncY;
inPtr += inIncY;
}
outPtr += outIncZ;
inPtr += inIncZ;
}
}
//------------------------------------------------------------------------------
// This method contains a switch statement that calls the correct
// templated function for the input data type. The output data
// must match input type. This method does handle boundary conditions.
void vtkImageGradientMagnitude::ThreadedExecute(
vtkImageData* inData, vtkImageData* outData, int outExt[6], int id)
{
void* inPtr;
void* outPtr = outData->GetScalarPointerForExtent(outExt);
inPtr = inData->GetScalarPointer();
// this filter expects that input is the same type as output.
if (inData->GetScalarType() != outData->GetScalarType())
{
vtkErrorMacro(<< "Execute: input data type, " << inData->GetScalarType()
<< ", must match out ScalarType " << outData->GetScalarType());
return;
}
switch (inData->GetScalarType())
{
vtkTemplateMacro(vtkImageGradientMagnitudeExecute(this, inData, static_cast<VTK_TT*>(inPtr),
outData, static_cast<VTK_TT*>(outPtr), outExt, id));
default:
vtkErrorMacro(<< "Execute: Unknown ScalarType");
return;
}
}