【opencv】简单代码示例

1.样例1-图像读取与显示

#include 
#include 
using namespace cv;
using namespace std;
int main()
{
    //Mat src = imread("./1.png", IMREAD_GRAYSCALE);
    Mat src = imread("./1.png");
    if (src.empty())
    {
        cout << "Did not find the image" << endl;
        return 0;
    }
    namedWindow("hello", WINDOW_FREERATIO);
    imshow("hello", src);
    waitKey(0);
    return 0;
}

2.样例2-图像对象的创建与赋值

#include 
#include 
using namespace cv;
using namespace std;
class QuickDemo
{
public:
    void colorSpaceDemo(Mat &image);
};
void QuickDemo::colorSpaceDemo(Mat &image)
{
    Mat gray, hsv;
    cvtColor(image, hsv, COLOR_BGR2HSV);
    cvtColor(image, gray, COLOR_BGR2GRAY);
    imshow("HSV", hsv);
    imshow("灰度", gray);
    imwrite("./hsv.png", hsv);
    imwrite("./gray.png", gray);
}
int main()
{
    //Mat src = imread("./1.png", IMREAD_GRAYSCALE);
    Mat src = imread("./1.png");
    if (src.empty())
    {
        cout << "Did not find the image" << endl;
        return 0;
    }
    namedWindow("hello", WINDOW_FREERATIO);
    imshow("hello", src);
    QuickDemo qd;
    qd.colorSpaceDemo(src);

    waitKey(0);
    return 0;
}