opencv两张图片作差值_opencv两张图片求差

第一种：

关键函数cvAbsDiff()

代码如下：

#include "cv.h"
#include "highgui.h"
#include "cxcore.h"
 
int main(int argc,char** argv)
{cvNamedWindow("a",0);
 IplImage* img=cvLoadImage("11.jpg");
 cvShowImage("a",img);
 
 cvNamedWindow("b",0);
 IplImage* img1=cvLoadImage("12.jpg");
 cvShowImage("b",img1);
 
 IplImage* diff=cvCreateImage(cvGetSize(img),img->depth,img->nChannels);
 cvAbsDiff(img,img1,diff);
 cvNamedWindow("r",0);
 cvShowImage("r",diff);
 
 
 while (1)
 {if (cvWaitKey(100)==27) break;
 }
 
 cvDestroyWindow("a");
 cvDestroyWindow("b");
 cvReleaseImage(&img);
 cvReleaseImage(&img1);
 cvReleaseImage(&diff);
 return 0;
}

第二种：

这个程序是两张图片做帧差，用C++实现的，把不同的地方用框框起来

#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;
 
}