[ VIGRA Homepage | Function Index | Class Index | Namespaces | File List | Main Page ]

resize.cxx |

Resize an image using resizeImageSplineInterpolation()
Usage: `example_resize 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 */
/* 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 */
/* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, */
/* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING */
/* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR */
/* OTHER DEALINGS IN THE SOFTWARE. */
/* */
/************************************************************************/
#include <iostream>
#include <vigra/multi_array.hxx>
#include <vigra/rgbvalue.hxx>
#include <vigra/resizeimage.hxx>
#include <vigra/impex.hxx>
template<class ImageType>
bool resizeImageFile(const vigra::ImageImportInfo &info, const vigra::Shape2 &newSize,
int method, const char *outputFilename)
{
// create a gray scale image of appropriate size
ImageType in(info.shape());
ImageType out(newSize);
// import the image just read
importImage(info, destImage(in));
using vigra::BSpline;
switch(method)
{
case 0:
// equiv. to resizeImageSplineInterpolation with BSpline<0, double>:
resizeImageNoInterpolation(in, out);
break;
case 1:
// equiv. to resizeImageSplineInterpolation with BSpline<1, double>:
resizeImageLinearInterpolation(in, out);
break;
case 2:
resizeImageSplineInterpolation(in, out,
BSpline<2, double>());
break;
case 3:
resizeImageSplineInterpolation(in, out,
BSpline<3, double>());
break;
case 4:
resizeImageSplineInterpolation(in, out,
BSpline<4, double>());
break;
case 5:
resizeImageSplineInterpolation(in, out,
BSpline<5, double>());
break;
case 6:
resizeImageSplineInterpolation(in, out,
BSpline<6, double>());
break;
case 7:
resizeImageSplineInterpolation(in, out,
BSpline<7, double>());
break;
default:
std::cerr << "Invalid method " << method << " (must be 0..7)!\n";
return false;
}
// write the image to the file given as second argument
// the file type will be determined from the file name's extension
exportImage(out, vigra::ImageExportInfo(outputFilename));
return true;
}
int main(int argc, char ** argv)
{
using namespace vigra;
if((argc < 3) || (argc > 5))
{
std::cout << "Usage: " << argv[0] << " infile outfile [factor] [method]" << std::endl;
std::cout << "(supported formats: " << impexListFormats() << ")" << std::endl;
std::cout << "If factor or method are not provided, you will be asked for\nthem on the command line." << std::endl;
return 1;
}
try
{
// read image given as first argument
// file type is determined automatically
ImageImportInfo info(argv[1]);
double sizefactor;
if(argc > 3)
{
sizefactor = atof(argv[3]);
}
else
{
std::cerr << "Resize factor ? ";
std::cin >> sizefactor;
}
int method;
if(argc > 4)
{
method = atoi(argv[4]);
}
else
{
std::cerr << "Method (0: pixel repetition, 1: linear, 2-7: spline) ? ";
std::cin >> method;
}
// calculate new image size
Shape2 newSize((info.shape() - Shape2(1,1)) * sizefactor + Shape2(1,1));
if(info.isGrayscale())
{
if(!resizeImageFile<MultiArray<2, UInt8> >(info, newSize, method, argv[2]))
return 1;
}
else
{
if(!resizeImageFile<MultiArray<2, RGBValue<UInt8> > >(info, newSize, method, argv[2]))
return 1;
}
}
catch (std::exception & e)
{
// catch any errors that might have occurred and print their reason
std::cout << e.what() << std::endl;
return 1;
}
return 0;
}

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany | html generated using doxygen and Python vigra 1.11.0