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profile.cxx

Find the gray value profile along the image diagonal by means of a LineIterator
Usage: example_profile infile, generates profile.gif

/************************************************************************/
/* */
/* 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 */
/* restriction, including without limitation the rights to use, */
/* 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: */
/* */
/* 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 */
/* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT */
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/* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR */
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/* */
/************************************************************************/
#include <iostream>
#include <vigra/stdimage.hxx>
#include <vigra/imageiteratoradapter.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;
return 1;
}
try
{
ImageImportInfo info(argv[1]);
vigra_precondition(info.isGrayscale(), "Sorry, cannot operate on color images");
int w = info.width();
int h = info.height();
BImage in(w, h);
importImage(info, destImage(in));
int length = (w < h) ? h : w;
// create output image of appropriate size
BImage out(length, 256);
// paint output image white
out = 255;
// create line iterator that iterates along the image diagonal
LineIterator<BImage::Iterator> line(in.upperLeft(), in.lowerRight());
// create line iterator that marks the end of iteration
LineIterator<BImage::Iterator> end(in.lowerRight(), in.lowerRight());
// create image iterator that points to the first pixel of the last
// row of the destination image
BImage::Iterator column = out.upperLeft() + Diff2D(0, 255);
// iterate along the line and across the destination image
for(; line != end; ++line, ++column.x)
{
BImage::Iterator row(column);
// paint all pixels black whose coordinates are smaller than the
// current gray value along the diagonal
for(int y=0; y <= *line; ++y, --row.y) *row = 0;
}
std::cout << "Writing profile.gif" << std::endl;
exportImage(srcImageRange(out), ImageExportInfo("profile.gif"));
}
catch (std::exception & e)
{
std::cout << e.what() << std::endl;
return 1;
}
return 0;
}
vigra::BasicImage::lowerRight
traverser lowerRight()
Definition basicimage.hxx:936
vigra::BasicImage< UInt8 >::Iterator
BasicImageIterator< UInt8, UInt8 ** > Iterator
Definition basicimage.hxx:532
vigra::BasicImage::upperLeft
traverser upperLeft()
Definition basicimage.hxx:925
vigra::Diff2D
Two dimensional difference vector.
Definition diff2d.hxx:186
vigra::ImageExportInfo
Argument object for the function exportImage().
Definition imageinfo.hxx:134
vigra::ImageImportInfo
Argument object for the function importImage().
Definition imageinfo.hxx:391
vigra::ImageImportInfo::isGrayscale
bool isGrayscale() const
vigra::ImageImportInfo::height
int height() const
vigra::ImageImportInfo::width
int width() const
vigra::LineIterator
Iterator adapter to iterate along an arbitrary line on the image.
Definition imageiteratoradapter.hxx:480
vigra::exportImage
void exportImage(...)
Write an image to a file.
vigra::importImage
void importImage(...)
Read an image from a file.
impex.hxx
image import and export functions
vigra
vigra::impexListFormats
std::string impexListFormats()
List the image formats VIGRA can read and write.
vigra::BImage
BasicImage< UInt8 > BImage
Definition stdimage.hxx:62

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany | html generated using doxygen and Python vigra 1.12.4