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284 lines
8.7 KiB
284 lines
8.7 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkImageGradientMagnitude.cxx,v $
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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#include "vtkImageGradientMagnitude.h"
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#include "vtkDataArray.h"
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#include "vtkImageData.h"
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#include "vtkInformation.h"
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#include "vtkInformationVector.h"
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#include "vtkObjectFactory.h"
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#include "vtkStreamingDemandDrivenPipeline.h"
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#include "vtkPointData.h"
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#include <math.h>
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vtkCxxRevisionMacro(vtkImageGradientMagnitude, "$Revision: 1.44 $");
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vtkStandardNewMacro(vtkImageGradientMagnitude);
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//----------------------------------------------------------------------------
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// Construct an instance of vtkImageGradientMagnitude fitler.
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vtkImageGradientMagnitude::vtkImageGradientMagnitude()
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{
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this->SetNumberOfInputPorts(1);
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this->SetNumberOfOutputPorts(1);
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this->Dimensionality = 2;
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this->HandleBoundaries = 1;
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}
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//----------------------------------------------------------------------------
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void vtkImageGradientMagnitude::PrintSelf(ostream& os, vtkIndent indent)
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{
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this->Superclass::PrintSelf(os, indent);
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os << indent << "HandleBoundaries: " << this->HandleBoundaries << "\n";
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os << indent << "Dimensionality: " << this->Dimensionality << "\n";
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}
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//----------------------------------------------------------------------------
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// This method is passed a region that holds the image extent of this filters
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// input, and changes the region to hold the image extent of this filters
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// output.
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int vtkImageGradientMagnitude::RequestInformation (
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vtkInformation* vtkNotUsed(request),
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vtkInformationVector** inputVector,
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vtkInformationVector* outputVector)
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{
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int extent[6];
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int idx;
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// get the info objects
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vtkInformation* outInfo = outputVector->GetInformationObject(0);
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vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);
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// invalid setting, it has not been set, so default to whole Extent
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inInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(),
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extent);
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if ( ! this->HandleBoundaries)
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{
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// shrink output image extent.
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for (idx = 0; idx < this->Dimensionality; ++idx)
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{
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extent[idx*2] += 1;
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extent[idx*2 + 1] -= 1;
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}
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}
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outInfo->Set(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(),
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extent, 6);
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return 1;
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}
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//----------------------------------------------------------------------------
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// This method computes the input extent necessary to generate the output.
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int vtkImageGradientMagnitude::RequestUpdateExtent (
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vtkInformation* vtkNotUsed(request),
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vtkInformationVector** inputVector,
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vtkInformationVector* outputVector)
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{
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int wholeExtent[6];
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int idx;
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// get the info objects
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vtkInformation* outInfo = outputVector->GetInformationObject(0);
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vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
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// invalid setting, it has not been set, so default to whole Extent
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inInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(),
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wholeExtent);
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int inUExt[6];
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outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT(), inUExt);
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// grow input whole extent.
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for (idx = 0; idx < this->Dimensionality; ++idx)
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{
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inUExt[idx*2] -= 1;
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inUExt[idx*2+1] += 1;
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if (this->HandleBoundaries)
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{
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// we must clip extent with whole extent is we hanlde boundaries.
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if (inUExt[idx*2] < wholeExtent[idx*2])
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{
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inUExt[idx*2] = wholeExtent[idx*2];
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}
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if (inUExt[idx*2 + 1] > wholeExtent[idx*2 + 1])
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{
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inUExt[idx*2 + 1] = wholeExtent[idx*2 + 1];
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}
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}
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}
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inInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT(), inUExt, 6);
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return 1;
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}
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//----------------------------------------------------------------------------
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// This execute method handles boundaries.
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// it handles boundaries. Pixels are just replicated to get values
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// out of extent.
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template <class T>
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void vtkImageGradientMagnitudeExecute(vtkImageGradientMagnitude *self,
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vtkImageData *inData, T *inPtr,
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vtkImageData *outData, T *outPtr,
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int outExt[6], int id)
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{
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int idxC, idxX, idxY, idxZ;
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int maxC, maxX, maxY, maxZ;
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vtkIdType inIncX, inIncY, inIncZ;
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vtkIdType outIncX, outIncY, outIncZ;
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unsigned long count = 0;
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unsigned long target;
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int axesNum;
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int *wholeExtent;
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vtkIdType *inIncs;
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double r[3], d, sum;
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int useZMin, useZMax, useYMin, useYMax, useXMin, useXMax;
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int *inExt = inData->GetExtent();
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// find the region to loop over
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maxC = outData->GetNumberOfScalarComponents();
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maxX = outExt[1] - outExt[0];
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maxY = outExt[3] - outExt[2];
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maxZ = outExt[5] - outExt[4];
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target = (unsigned long)((maxZ+1)*(maxY+1)/50.0);
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target++;
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// Get the dimensionality of the gradient.
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axesNum = self->GetDimensionality();
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// Get increments to march through data
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inData->GetContinuousIncrements(outExt, inIncX, inIncY, inIncZ);
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outData->GetContinuousIncrements(outExt, outIncX, outIncY, outIncZ);
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// The data spacing is important for computing the gradient.
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inData->GetSpacing(r);
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r[0] = 0.5 / r[0];
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r[1] = 0.5 / r[1];
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r[2] = 0.5 / r[2];
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// get some other info we need
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inIncs = inData->GetIncrements();
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wholeExtent = inData->GetExtent();
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// Move the starting pointer to the correct location.
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inPtr += (outExt[0]-inExt[0])*inIncs[0] +
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(outExt[2]-inExt[2])*inIncs[1] +
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(outExt[4]-inExt[4])*inIncs[2];
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// Loop through ouput pixels
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for (idxZ = 0; idxZ <= maxZ; idxZ++)
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{
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useZMin = ((idxZ + outExt[4]) <= wholeExtent[4]) ? 0 : -inIncs[2];
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useZMax = ((idxZ + outExt[4]) >= wholeExtent[5]) ? 0 : inIncs[2];
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for (idxY = 0; !self->AbortExecute && idxY <= maxY; idxY++)
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{
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if (!id)
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{
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if (!(count%target))
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{
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self->UpdateProgress(count/(50.0*target));
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}
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count++;
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}
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useYMin = ((idxY + outExt[2]) <= wholeExtent[2]) ? 0 : -inIncs[1];
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useYMax = ((idxY + outExt[2]) >= wholeExtent[3]) ? 0 : inIncs[1];
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for (idxX = 0; idxX <= maxX; idxX++)
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{
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useXMin = ((idxX + outExt[0]) <= wholeExtent[0]) ? 0 : -inIncs[0];
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useXMax = ((idxX + outExt[0]) >= wholeExtent[1]) ? 0 : inIncs[0];
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for (idxC = 0; idxC < maxC; idxC++)
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{
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// do X axis
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d = (double)(inPtr[useXMin]);
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d -= (double)(inPtr[useXMax]);
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d *= r[0]; // multiply by the data spacing
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sum = d * d;
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// do y axis
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d = (double)(inPtr[useYMin]);
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d -= (double)(inPtr[useYMax]);
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d *= r[1]; // multiply by the data spacing
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sum += (d * d);
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if (axesNum == 3)
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{
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// do z axis
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d = (double)(inPtr[useZMin]);
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d -= (double)(inPtr[useZMax]);
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d *= r[2]; // multiply by the data spacing
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sum += (d * d);
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}
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*outPtr = (T)(sqrt(sum));
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outPtr++;
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inPtr++;
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}
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}
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outPtr += outIncY;
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inPtr += inIncY;
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}
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outPtr += outIncZ;
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inPtr += inIncZ;
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}
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}
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//----------------------------------------------------------------------------
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// This method contains a switch statement that calls the correct
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// templated function for the input data type. The output data
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// must match input type. This method does handle boundary conditions.
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void vtkImageGradientMagnitude::ThreadedExecute (vtkImageData *inData,
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vtkImageData *outData,
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int outExt[6], int id)
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{
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void *inPtr;
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void *outPtr = outData->GetScalarPointerForExtent(outExt);
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inPtr = inData->GetScalarPointer();
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// this filter expects that input is the same type as output.
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if (inData->GetScalarType() != outData->GetScalarType())
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{
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vtkErrorMacro(<< "Execute: input data type, "
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<< inData->GetScalarType()
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<< ", must match out ScalarType "
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<< outData->GetScalarType());
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return;
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}
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switch (inData->GetScalarType())
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{
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vtkTemplateMacro(
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vtkImageGradientMagnitudeExecute(this,
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inData, (VTK_TT *)(inPtr), outData,
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(VTK_TT *)(outPtr), outExt, id));
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default:
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vtkErrorMacro(<< "Execute: Unknown ScalarType");
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return;
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}
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}
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