Opencv C++成长之路(三):图像的缩放

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结果

原图像大小:
rows : 1080
cols : 1920
缩放后图像大小:
rows : 540
cols : 960

Show me the code

#include <iostream>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <string>
#include <cmath>

using namespace std;

int main() {
    // 图像路径
    const string fileName = "xxx.jpg";
    
    // 读入图片
    cv::Mat origin = cv::imread(fileName);
    
    // 显示原图像尺寸
    cout << "原图像大小:" << endl;
    cout << "rows : " << origin.rows << endl;
    cout << "cols : " << origin.cols << endl;
    cout << endl;
    
    // 设置缩放系数
    const float rate = 0.5;
    
    // 缩放(源图像, 目的图像, 缩放尺寸)
    cv::resize(origin, 
               origin, 
               cv::Size(round(origin.cols * rate), round(origin.rows * rate)));
    
    // 显示原图像尺寸
    cout << "缩放后图像大小:" << endl;
    cout << "rows : " << origin.rows << endl;
    cout << "cols : " << origin.cols << endl;
    cout << endl;
    
    cv::waitKey(0);
}

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转载自blog.csdn.net/weixin_44344462/article/details/88741947