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mirror.cxx |

Mirror an image file (horizontal or vertical)
Usage: `mirror infile outfile`

#include <iostream>
#include <vigra/multi_array.hxx>
#include "vigra/stdimage.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: " << vigra::impexListFormats() << ")" << std::endl;
return 1;
}
// ask which axis should be used
int axis;
std::cout << "Which axis? horizontal (1) or vertical (2): ";
std::cin >> axis;
try
{
// read image given as first argument
// file type is determined automatically
vigra::ImageImportInfo info(argv[1]);
if(info.isGrayscale())
{
// write image data to MultiArray
vigra::MultiArray<2, unsigned char> tempImage(info.shape());
importImage(info, destImage(tempImage));
// create a gray scale image of appropriate size
vigra::MultiArray<2, unsigned char> in(info.shape());
// mirror horizontal
if (axis == 1) {
for (int i=0; i<info.height(); i++) {
in.bind<1>(i) = tempImage.bind<1>(info.height()-(i+1));
}
}
// mirror vertical
if (axis == 2) {
for (int i=0; i<info.width(); i++) {
in.bind<0>(i) = tempImage.bind<0>(info.width()-(i+1));
}
}
// write the image to the file given as second argument
// the file type will be determined from the file name's extension
exportImage(srcImageRange(in), vigra::ImageExportInfo(argv[2]));
}
else
{
// write image data to MultiArray
vigra::MultiArray<2, vigra::RGBValue<unsigned char> > tempImage(info.shape());
importImage(info, destImage(tempImage));
// create a RGB-image of appropriate size
vigra::MultiArray<2, vigra::RGBValue<unsigned char> > in(info.shape());
// mirror horizontal
if (axis == 1) {
for (int i=0; i<info.height(); i++) {
in.bind<1>(i) = tempImage.bind<1>(info.height()-(i+1));
}
}
// mirror vertical
if (axis == 2) {
for (int i=0; i<info.width(); i++) {
in.bind<0>(i) = tempImage.bind<0>(info.width()-(i+1));
}
}
// write the image to the file given as second argument
// the file type will be determined from the file name's extension
exportImage(srcImageRange(in), vigra::ImageExportInfo(argv[2]));
}
}
catch (vigra::StdException & 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 1.9.1 (Mon Jun 3 2013)