C++使用opencv处理两张图片的帧差

#include <iostream>
#include <opencv2/opencv.hpp>
 
using namespace std;
using namespace cv;
 
int main()
{
 
 Mat currentframe, previousframe;
 Mat img1, img2, img3;
 
 img1 = imread("D:/1129/20006/1123120.jpg");
 img2 = imread("D:/1129/20006/1128120.jpg");
 img3 = imread("D:/1129/20006/1128120.jpg");
 
 cvtColor(img1, previousframe, CV_BGR2GRAY);
 cvtColor(img2, currentframe, CV_BGR2GRAY); //转化为单通道灰度图
 
 absdiff(currentframe, previousframe, currentframe);//做差求绝对值 
 threshold(currentframe, currentframe, 130, 255.0, CV_THRESH_BINARY);
 dilate(currentframe, currentframe, Mat());//膨胀
 erode(currentframe, currentframe, Mat());//腐蚀
 
 imshow("moving area", currentframe); //显示图像 
 
 vector<vector<Point> > v;
 vector<Vec4i> hierarchy;
 Mat result;
 Rect rect;
 findContours(currentframe, v, hierarchy, RETR_EXTERNAL, CV_CHAIN_APPROX_NONE);
 for (int i = 0; i < hierarchy.size(); i++)
 {
 rect = boundingRect(v.at(i));
 //rect.width *= 1.5;
 rect.height *= 1.5;
 // 画最小的圆，贴着黑色
 //drawContours(currentframe, v, i, Scalar(0, 0, 255), 1, 8, hierarchy);
 // 画矩形包围圆
 rectangle(img3, rect, Scalar(0, 255, 0), 2);
 }
 
 imwrite("E:/res1.jpg", img3);
 imshow("moving area1", img3);
 
 //把当前帧保存作为下一次处理的前一帧 
 //cvtColor(tempframe, previousframe, CV_BGR2GRAY);
 waitKey(33);
 system("pause");
 return 0;
 
}