圖像縮放：resize( )

學OpenCV

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原書代碼有問題，這里我改了下。

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啊

#include <iostream>
#include <opencv2/opencv.hpp>

using namespace std;
using namespace cv;

int Test1()
{
    Mat img = imread(R"(C:\testNoGit\learnOpenCV4-master\data\lena.png)"/*,IMREAD_GRAYSCALE*/);
    if (img.empty())
    {
        cout << "bad file" << endl;
        return 1;
    }

    Mat imgSmall, imgBig1, imgBig2, imgBig3;    
    
    int rows = img.rows;
    int cols = img.cols;
    resize(img, imgSmall, Size(cols/2,rows/2), 0, 0, INTER_AREA);//變為原圖的1/2*1/2=1/4大小
    imshow("imgSmall", imgSmall);

    resize(img, imgBig1, Size(), 3.0, 3.0, INTER_NEAREST);//顆粒感
    imshow("imgBig1", imgBig1);

    resize(img, imgBig2, Size(), 3.0, 3.0, INTER_LINEAR);//模糊，虛，看着暈
    imshow("imgBig2", imgBig2);

    resize(img, imgBig3, Size(), 3.0, 3.0, INTER_CUBIC);//效果好
    imshow("imgBig3", imgBig3);

    return 0;
}

int main()
{
    Test1();
    waitKey(0);

    return 0;
}

 

啊