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boundarytensor.cxx |

Measure boundary and corner strengths with the boundaryTensor(): boundarytensor.cxx
Usage: `example_boundarytensor infile`, creates `boundarystrength.tif` and `cornerstrength.tif`

/************************************************************************/
/* */
/* Copyright 1998-2004 by Ullrich Koethe */
/* */
/* This file is part of the VIGRA computer vision library. */
/* The VIGRA Website is */
/* http://hci.iwr.uni-heidelberg.de/vigra/ */
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/* ullrich.koethe@iwr.uni-heidelberg.de or */
/* vigra@informatik.uni-hamburg.de */
/* */
/* Permission is hereby granted, free of charge, to any person */
/* obtaining a copy of this software and associated documentation */
/* files (the "Software"), to deal in the Software without */
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/* sell copies of the Software, and to permit persons to whom the */
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/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the */
/* Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND */
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/************************************************************************/
#include <iostream>
#include <vigra/multi_array.hxx>
#include <vigra/tensorutilities.hxx>
#include <vigra/boundarytensor.hxx>
#include <vigra/impex.hxx>
using namespace vigra;
int main(int argc, char ** argv)
{
if(argc != 2)
{
std::cout << "Usage: " << argv[0] << " infile" << std::endl;
std::cout << "(supported formats: " << impexListFormats() << ")" << std::endl;
std::cout << "creates: boundarystrength.tif, cornerstrength.tif" << std::endl;
return 1;
}
try
{
ImageImportInfo info(argv[1]);
int w = info.width(), h = info.height();
// create image of appropriate size for boundary tensor
MultiArray<2, TinyVector<float, 3> > boundarytensor(w, h);
// input scale of the bandpass to be used
double scale;
std::cout << "Operator scale ? ";
std::cin >> scale;
if(info.isGrayscale())
{
MultiArray<2, float> in(w, h);
importImage(info, in);
boundaryTensor(in, boundarytensor, scale);
}
else if(info.isColor())
{
MultiArray<2, RGBValue<float> > in(w, h);
importImage(info, in);
// calculate the boundary tensor for every channel and add the results
MultiArray<2, TinyVector<float, 3> > bandtensor(w, h);
for(int b=0; b<3; ++b)
{
boundaryTensor(in.bindElementChannel(b), bandtensor, scale);
boundarytensor += bandtensor;
}
}
else
{
std::cerr << "Sorry, can only operate on gray and color images.\n";
return 1;
}
MultiArray<2, float> boundarystrength(w, h), cornerness(w, h);
MultiArray<2, TinyVector<float, 2> > edgeness(w,h);
// compute the total boundary strength in each pixel
tensorTrace(boundarytensor, boundarystrength);
// decompose the boundary strength into corner and edge parts (where edge part also contains an orientation)
tensorToEdgeCorner(boundarytensor, edgeness, cornerness);
exportImage(boundarystrength, ImageExportInfo("boundarystrength.tif").setPixelType("UINT8"));
exportImage(cornerness, ImageExportInfo("cornerstrength.tif").setPixelType("UINT8"));
}
catch (std::exception & e)
{
std::cout << e.what() << std::endl;
return 1;
}
return 0;
}
vigra::MultiArray
Main MultiArray class containing the memory management.
Definition: multi_array.hxx:2474
vigra
vigra::impexListFormats
std::string impexListFormats()
List the image formats VIGRA can read and write.
vigra::ImageImportInfo::height
int height() const
vigra::importImage
void importImage(...)
Read an image from a file.
vigra::tensorToEdgeCorner
void tensorToEdgeCorner(...)
Decompose a symmetric 2x2 tensor into its edge and corner parts.
vigra::ImageImportInfo::isColor
bool isColor() const
vigra::tensorTrace
void tensorTrace(...)
Calculate the trace of a 2x2 tensor.
vigra::ImageImportInfo::isGrayscale
bool isGrayscale() const
impex.hxx
image import and export functions
vigra::ImageImportInfo
Argument object for the function importImage().
Definition: imageinfo.hxx:390
vigra::ImageExportInfo
Argument object for the function exportImage().
Definition: imageinfo.hxx:133
vigra::boundaryTensor
void boundaryTensor(...)
Calculate the boundary tensor for a scalar valued image.
vigra::ImageImportInfo::width
int width() const
vigra::exportImage
void exportImage(...)
Write an image to a file.

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany | html generated using doxygen and Python vigra 1.11.1