CPP和Opencv联合编程基础第一章第一节加载图像

一.伪代码

加载一张图片-> 准备一张图片，给出路径，如"D:\Microsoft.jpg"。
再C++中加载图片，要给图像准备一个对象。opencv中-> Mat 就是干这个事情。
加载图片之前做下确认，图片是否真实存在。
图片加载了，要放到窗口里面-> namedWindow

点击查看代码

enum WindowFlags {
       //选用该模式可以修改窗口大小
       WINDOW_NORMAL     = 0x00000000, //!< the user can resize the window (no constraint) / also use to switch a fullscreen window to a normal size.
       //窗口大小由图片决定
       WINDOW_AUTOSIZE   = 0x00000001, //!< the user cannot resize the window, the size is constrainted by the image displayed.
       WINDOW_OPENGL     = 0x00001000, //!< window with opengl support.
       WINDOW_FULLSCREEN = 1,          //!< change the window to fullscreen.
       WINDOW_FREERATIO  = 0x00000100, //!< the image expends as much as it can (no ratio constraint).
       WINDOW_KEEPRATIO  = 0x00000000, //!< the ratio of the image is respected.
       WINDOW_GUI_EXPANDED=0x00000000, //!< status bar and tool bar
       WINDOW_GUI_NORMAL = 0x00000010, //!< old fashious way
    };

选WINDOW_NORMAL加载模式，调整窗口大小->resizeWindow
显示图片->imshow

二.完整代码

新建一个控制台程序。

点击查看代码

#include <iostream>
#include <opencv2/highgui.hpp>
#include <opencv2/core.hpp>
#include <opencv2/imgcodecs.hpp>

using namespace cv;
using namespace std;

int main()
{
    Mat image;
    image = imread("D:\\Microsoft.jpg");
    //判断图片是否存在
    if (image.empty())
    {
        cout << "Could not open or find the image" << endl;
        return -1;
    }

    //创建串口来显示图片
    namedWindow("Display window", WINDOW_NORMAL); 
    //调整窗口大小
    resizeWindow("Display window", cv::Size(1280, 960));
    //显示图片
    imshow("Display window", image); 
    //等待按键按下
    waitKey(0); 
    
    std::cout << "Hello World!\n";
}