opencv(3) 通过ROI感兴趣区域来裁剪图像

ROI感兴趣区域 //1:图像的列的起点，宽2：行的起点，即高，（100(列)，100（行），3：（300，300），即从（100，100）开始，向左和向下各300步 cv::Rect rect(100,100,300,300); #include<stdio.h> #include <opencv2/core.hpp> #include <opencv2/imgcodecs.hpp> #include <opencv2/highgui.hpp> using namespace cv; void PrintMs(const char *text = "") { static long long last = 0; long long cur = getTickCount(); if (last == 0) { last = cur; return; } long long ms = 0; ms = ((double)(cur - last) / getTickFrequency()) * 1000; if (*text != 0) { printf("%s = %dms\n ", text, ms); } last = getTickCount(); } int main(int argc, char *argv) { Mat src = imread("lena.jpg"); Rect rect(100, 100, 200, 200); Mat roi = src(rect); namedWindow("Lena"); namedWindow("ROI"); imshow("Lena", src); imshow("ROI", roi); waitKey(0); return 0; }