resize

#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>

int
main(int argc, char *argv[])
{　 float up;
    cv::Mat src_img = cv::imread(argv[1], 1);
    if(src_img.empty()) return -1;
   up=atof(argv[3]);
   cv::Mat dst_img(src_img.rows*up, src_img.cols*up, src_img.type());



    // INTER_CUBIC（バイキュービック補間）でのサイズ変更
    cv::resize(src_img, dst_img, dst_img.size(), cv::INTER_CUBIC);

    cv::namedWindow("resize image", CV_WINDOW_AUTOSIZE|CV_WINDOW_FREERATIO);
    cv::imshow("resize image", dst_img);

    cv::imwrite(argv[2],dst_img);
    cv::waitKey(0);
}