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edge.cxx |

Find edges by means of a differenceOfExponentialEdgeImage()
Usage: `example_edge infile outfile`

/************************************************************************/
/* */
/* Copyright 1998-2002 by Ullrich Koethe */
/* */
/* This file is part of the VIGRA computer vision library. */
/* The VIGRA Website is */
/* http://hci.iwr.uni-heidelberg.de/vigra/ */
/* Please direct questions, bug reports, and contributions to */
/* 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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/* copy, modify, merge, publish, distribute, sublicense, and/or */
/* sell copies of the Software, and to permit persons to whom the */
/* Software is furnished to do so, subject to the following */
/* conditions: */
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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 */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES */
/* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND */
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/************************************************************************/
#include <iostream>
#include <vigra/multi_array.hxx>
#include <vigra/edgedetection.hxx>
#include <vigra/impex.hxx>
using namespace vigra;
int main(int argc, char ** argv)
{
if(argc != 3)
{
std::cout << "Usage: " << argv[0] << " infile outfile" << std::endl;
std::cout << "(supported formats: " << impexListFormats() << ")" << std::endl;
return 1;
}
try
{
ImageImportInfo info(argv[1]);
vigra_precondition(info.isGrayscale(), "Sorry, cannot operate on color images");
MultiArray<2, UInt8> in(info.shape());
importImage(info, in);
// input width of edge detection filter
int which;
std::cout << "Use Canny or Shen-Castan detector (1 or 2) ? ";
std::cin >> which;
// input width of edge detection filter
double scale;
std::cout << "Operator scale ? ";
std::cin >> scale;
// input threshold for gradient magnitude
double threshold;
std::cout << "Gradient threshold ? ";
std::cin >> threshold;
// create output image of appropriate size
MultiArray<2, UInt8> out(info.shape());
// paint output image white
out = 255;
if(which == 2)
{
// call Shen-Castan edge detection algorithm
// edges will be marked black
differenceOfExponentialEdgeImage(in, out, scale, threshold, 0);
}
else
{
// call Canny edge detection algorithm
// edges will be marked black
cannyEdgeImage(in, out, scale, threshold, 0);
}
exportImage(out, ImageExportInfo(argv[2]));
}
catch (std::exception & e)
{
std::cout << e.what() << std::endl;
return 1;
}
return 0;
}
vigra::cannyEdgeImage
void cannyEdgeImage(...)
Detect and mark edges in an edge image using Canny's algorithm.
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::importImage
void importImage(...)
Read an image from a file.
vigra::differenceOfExponentialEdgeImage
void differenceOfExponentialEdgeImage(...)
Detect and mark edges in an edge image using the Shen/Castan zero-crossing detector.
vigra::ImageImportInfo::isGrayscale
bool isGrayscale() const
impex.hxx
image import and export functions
vigra::ImageImportInfo::shape
MultiArrayShape< 2 >::type shape() const
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::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