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resize.cxx | ![]() |
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Resize an image using Geometric Transformations
Usage: resize infile outfile
/************************************************************************/ /* */ /* Copyright 1998-2002 by Ullrich Koethe */ /* Cognitive Systems Group, University of Hamburg, Germany */ /* */ /* This file is part of the VIGRA computer vision library. */ /* ( Version 1.2.0, Aug 07 2003 ) */ /* You may use, modify, and distribute this software according */ /* to the terms stated in the LICENSE file included in */ /* the VIGRA distribution. */ /* */ /* The VIGRA Website is */ /* http://kogs-www.informatik.uni-hamburg.de/~koethe/vigra/ */ /* Please direct questions, bug reports, and contributions to */ /* koethe@informatik.uni-hamburg.de */ /* */ /* THIS SOFTWARE IS PROVIDED AS IS AND WITHOUT ANY EXPRESS OR */ /* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */ /* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ /* */ /************************************************************************/ #include <iostream> #include "vigra/stdimage.hxx" #include "vigra/resizeimage.hxx" #include "vigra/impex.hxx" using namespace vigra; // MSVC doesn't support Koenig lookup 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; } try { // read image given as first argument // file type is determined automatically vigra::ImageImportInfo info(argv[1]); double sizefactor; std::cerr << "Resize factor ? "; std::cin >> sizefactor; int method; std::cerr << "Method (0 - pixel repetition, 1 - linear, 2 - spline ? "; std::cin >> method; // calculate new image size int nw = (int)(sizefactor*(info.width()-1) + 1.5); int nh = (int)(sizefactor*(info.height()-1) + 1.5); if(info.isGrayscale()) { // create a gray scale image of appropriate size vigra::BImage in(info.width(), info.height()); vigra::BImage out(nw, nh); // import the image just read importImage(info, destImage(in)); switch(method) { case 0: // resize the image, using a bi-cubic spline algorithms resizeImageNoInterpolation(srcImageRange(in), destImageRange(out)); break; case 1: // resize the image, using a bi-cubic spline algorithms resizeImageLinearInterpolation(srcImageRange(in), destImageRange(out)); break; default: // resize the image, using a bi-cubic spline algorithms resizeImageSplineInterpolation(srcImageRange(in), destImageRange(out)); } // write the image to the file given as second argument // the file type will be determined from the file name's extension exportImage(srcImageRange(out), vigra::ImageExportInfo(argv[2])); } else { // create a RGB image of appropriate size vigra::BRGBImage in(info.width(), info.height()); vigra::BRGBImage out(nw, nh); // import the image just read importImage(info, destImage(in)); switch(method) { case 0: // resize the image, using a bi-cubic spline algorithms resizeImageNoInterpolation(srcImageRange(in), destImageRange(out)); break; case 1: // resize the image, using a bi-cubic spline algorithms resizeImageLinearInterpolation(srcImageRange(in), destImageRange(out)); break; default: // resize the image, using a bi-cubic spline algorithms resizeImageSplineInterpolation(srcImageRange(in), destImageRange(out)); } // write the image to the file given as second argument // the file type will be determined from the file name's extension exportImage(srcImageRange(out), vigra::ImageExportInfo(argv[2])); } } catch (vigra::StdException & e) { // catch any errors that might have occured and print their reason std::cout << e.what() << std::endl; return 1; } return 0; }
© Ullrich Köthe (koethe@informatik.uni-hamburg.de) |
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