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subimage_tutorial.cxx

Create a half-sized subimage
Usage: subimage_tutorial 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: " << impexListFormats() << ")" << std::endl;
return 1;
}
try
{
// read image given as first argument
// file type is determined automatically
if(info.isGrayscale())
{
// read image from file
importImage(info, imageArray);
// we want to cut out the center of the original image, such that the
// size of the remaining image is half the original
Shape2 upperLeft = info.shape() / 4,
lowerRight = info.shape() - upperLeft;
// create subimage around center for output
// write the subimage to the file provided as second command line argument
// the file type will be determined from the file name's extension
exportImage(subimage, ImageExportInfo(argv[2]));
}
else
{
// read image from file
importImage(info, imageArray);
// we want to cut out the center of the original image, such that the
// size of the remaining image is half the original
Shape2 upperLeft = info.shape() / 4,
lowerRight = info.shape() - upperLeft;
// create subimage around center for output
// write the subimage to the file provided as second command line argument
// the file type will be determined from the file name's extension
exportImage(subimage, ImageExportInfo(argv[2]));
}
}
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;
}
Argument object for the function exportImage().
Definition imageinfo.hxx:134
Argument object for the function importImage().
Definition imageinfo.hxx:391
Class for a single RGB value.
Definition rgbvalue.hxx:128
TinyVectorView< VALUETYPE, TO-FROM > subarray() const
Definition tinyvector.hxx:887
image import and export functions

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de)
Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany

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vigra 1.12.1