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/*=========================================================================
Program: Visualization Toolkit
Module: $RCSfile: vtkImageDifference.h,v $
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.
=========================================================================*/
// .NAME vtkImageDifference - Compares images for regression tests.
// .SECTION Description
// vtkImageDifference takes two rgb unsigned char images and compares them.
// It allows the images to be slightly different. If AllowShift is on,
// then each pixel can be shifted by one pixel. Threshold is the allowable
// error for each pixel.
//
// This is not a symetric filter and the difference computed is not symetric
// when AllowShift is on. Specifically in that case a pixel in SetImage input
// will be compared to the matching pixel in the input as well as to the
// input's eight connected neighbors. BUT... the opposite is not true. So for
// example if a valid image (SetImage) has a single white pixel in it, it
// will not find a match in the input image if the input image is black
// (because none of the nine suspect pixels are white). In contrast, if there
// is a single white pixel in the input image and the valid image (SetImage)
// is all black it will match with no error because all it has to do is find
// black pixels and even though the input image has a white pixel, its
// neighbors are not white.
#ifndef __vtkImageDifference_h
#define __vtkImageDifference_h
#include "vtkThreadedImageAlgorithm.h"
class VTK_IMAGING_EXPORT vtkImageDifference : public vtkThreadedImageAlgorithm
{
public:
static vtkImageDifference *New();
vtkTypeRevisionMacro(vtkImageDifference,vtkThreadedImageAlgorithm);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Specify the Image to compare the input to.
void SetImage(vtkDataObject *image) {this->SetInput(1,image);}
vtkImageData *GetImage();
// Description:
// Return the total error in comparing the two images.
double GetError(void);
void GetError(double *e) { *e = this->GetError(); };
// Description:
// Return the total thresholded error in comparing the two images.
// The thresholded error is the error for a given pixel minus the
// threshold and clamped at a minimum of zero.
double GetThresholdedError(void);
void GetThresholdedError(double *e) { *e = this->GetThresholdedError(); };
// Description:
// Specify a threshold tolerance for pixel differences.
vtkSetMacro(Threshold,int);
vtkGetMacro(Threshold,int);
// Description:
// Specify whether the comparison will allow a shift of one
// pixel between the images. If set, then the minimum difference
// between input images will be used to determine the difference.
// Otherwise, the difference is computed directly between pixels
// of identical row/column values.
vtkSetMacro(AllowShift,int);
vtkGetMacro(AllowShift,int);
vtkBooleanMacro(AllowShift,int);
// Description:
// Specify whether the comparison will include comparison of
// averaged 3x3 data between the images. For graphics renderings
// you normally would leave this on. For imaging operations it
// should be off.
vtkSetMacro(Averaging,int);
vtkGetMacro(Averaging,int);
vtkBooleanMacro(Averaging,int);
protected:
vtkImageDifference();
~vtkImageDifference() {};
double ErrorPerThread[VTK_MAX_THREADS];
double ThresholdedErrorPerThread[VTK_MAX_THREADS];
int AllowShift;
int Threshold;
int Averaging;
virtual int RequestInformation (vtkInformation *,
vtkInformationVector **,
vtkInformationVector *);
virtual int RequestUpdateExtent(vtkInformation *,
vtkInformationVector **,
vtkInformationVector *);
virtual void ThreadedRequestData(vtkInformation *request,
vtkInformationVector **inputVector,
vtkInformationVector *outputVector,
vtkImageData ***inData,
vtkImageData **outData,
int extent[6], int threadId);
private:
vtkImageDifference(const vtkImageDifference&); // Not implemented.
void operator=(const vtkImageDifference&); // Not implemented.
};
#endif
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