resize.cxx

Resize an image using resizeImageSplineInterpolation()
Usage: example_resize infile outfile

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/*               Copyright 1998-2002 by Ullrich Koethe                  */
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#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;
}