可能重复:
Understanding region of interest in openCV 2.4OpenCV的子图像
我想从图像获取子图像(一个由下面的红色框为界) (垫格式)。我该怎么做呢?
这是我迄今取得的进展:
include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
using namespace std;
using namespace cv;
int main()
{
Mat imgray, thresh;
vector<vector<Point> >contours;
vector<Point> cnt;
vector<Vec4i> hierarchy;
Point leftmost;
Mat im = imread("igoy1.jpg");
cvtColor(im, imgray, COLOR_BGR2GRAY);
threshold(imgray, thresh, 127, 255, 0);
findContours(thresh, contours, hierarchy, RETR_TREE,CHAIN_APPROX_SIMPLE);
}
这个问题如已被提问和回答,至少[这里](http://stackoverflow.com/questions/12705817/understanding-region-of-interest- in-opencv-2-4/12706208#12706208)and [there](http://stackoverflow.com/questions/12369697/access-sub-matrix-of-a-multidimensional-mat-in-opencv/12370641#12370641 ) – remi