OpenCv图像裁剪指点区域_roi

两种方式Range和ROI

#include <opencv2/opencv.hpp>

using namespace std;

using namespace cv;



void testrange(Mat &img)

{

    int m = img.rows;

    int n = img.cols;

    Mat temp = img(Range(0,m*0.8), Range(0,n*0.8));

    namedWindow("Range");

    imshow("Range", temp);

}



void testroi(Mat &img)

{

    int m = img.rows;

    int n = img.cols;

    Rect rect(0,0,n*0.8, m*0.8);

    Mat temp(img, rect);

    namedWindow("roi");

    imshow("roi", temp);

}



void main()

{

    Mat img = imread("lena.jpg",0);

    namedWindow("src");

    imshow("src", img);

    testroi(img);

    testrange(img);

    waitKey(0);

}