图像处理 模板匹配

Posted 2021-12-15 yocichen

演示用局部图片匹配整张图片

VS2017 + OpenCV4.0.1编译

 1 #include <iostream>
 2 #include <opencv2/opencv.hpp>
 3 #include <opencv2/core.hpp>
 4 #include <opencv2/highgui.hpp>
 5 #include <opencv2/imgproc.hpp>
 6 using namespace std;
 7 using namespace cv;
 8 
 9 //定义全局变量
10 Mat src, temp, res;
11 
12 //显示窗口名
13 string img_window = "source image";
14 string res_window = "result image";
15 
16 int match_method;
17 int max_tracker = 5;
18 
19 //滑动条回调函数
20 void match(int pos, void*)
21 
22     Mat subImg;
23     src.copyTo(subImg);//拷贝副本
24     int res_row = src.rows - temp.rows + 1;
25     int res_col = src.cols - temp.cols + 1;
26     res.create(res_row, res_col, CV_32FC1);//创建结果矩阵
27 
28     //模板匹配
29     matchTemplate(subImg, temp, res, match_method);
30     normalize(res, res, 0, 1, NORM_MINMAX, -1, Mat());
31 
32     //定位
33     double minVal, maxVal;
34     Point minLoc, maxLoc, matchLoc;
35     minMaxLoc(res, &minVal, &maxVal, &minLoc, &maxLoc, Mat());
36 
37     //分类讨论
38     if (match_method == TM_SQDIFF || match_method == TM_SQDIFF_NORMED)
39         matchLoc = minLoc;
40     else
41         matchLoc = maxLoc;
42 
43     //矩形框显示匹配结果
44     rectangle(subImg, matchLoc, Point(matchLoc.x + temp.cols, matchLoc.y + temp.rows), Scalar(0, 255, 0), 2);
45     rectangle(res, matchLoc, Point(matchLoc.x + temp.cols, matchLoc.y + temp.rows), Scalar(0, 255, 0), 2);
46     
47     imshow(img_window, subImg);
48     imshow(res_window, res);
49 
50 
51 int main()
52 
53     //读入原图和模板图
54     src = imread("D:\\trashBox\\testIMG\\memory.jpg");
55     temp = imread("D:\\trashBox\\testIMG\\temp.png");
56     imshow("模板", temp);
57     
58     //创建显示窗口
59     namedWindow(img_window);
60     namedWindow(res_window);
61 
62     //创建滑动条
63     match(2, 0);
64     createTrackbar("匹配方法", img_window, &match_method, max_tracker, match);
65     
66     waitKey(0);
67     return 0;
68 

参考资料

【1】http://www.opencv.org.cn/opencvdoc/2.3.2/html/doc/tutorials/imgproc/histograms/template_matching/template_matching.html#template-matching