之前学过的简单绘图方法,例如矩形,椭圆等,今天试着在视频图像中用矩形标注感兴趣区域(ROI)
<---- 图像篇 ---->
- #include "opencv2/core/core.hpp"
- #include "opencv2/imgproc/imgproc.hpp"
- #include "opencv2/highgui/highgui.hpp"
- #include <iostream>
- using namespace std;
- using namespace cv;
- bool draw;
- Mat src;//原始图像
- Mat roi;//ROI图像
- Point cursor;//初始坐标
- Rect rect;//标记ROI的矩形框
- void onMouse(int event, int x, int y, int flags, void *param)
- {
- Mat img = src.clone();
- switch (event)
- {
- //按下鼠标左键,点击鼠标图像时,清除之前ROI图像的显示窗口
- case CV_EVENT_LBUTTONDOWN:
- cvDestroyWindow("ROI");
- //存放起始坐标
- cursor = Point(x, y);
- //初始化起始矩形框
- rect = Rect(x, y, 0, 0);
- draw = true;
- break;
- //松开鼠标左键
- case CV_EVENT_LBUTTONUP:
- if (rect.height > 0 && rect.width > 0)
- {
- roi = img(Rect(rect.x, rect.y, rect.width, rect.height));
- rectangle(img, rect, Scalar(255, 255, 255),2);
- namedWindow("SignROI");
- imshow("SignROI", img);
- //将画过矩形框的图像用原图像还原
- src.copyTo(img);
- imshow("SrcImage", img);
- //显示ROI图像
- namedWindow("ROI");
- imshow("ROI", roi);
- waitKey(0);
- }
- draw = false;
- break;
- //移动光标
- case CV_EVENT_MOUSEMOVE:
- if (draw)
- {
- //用MIN得到左上点作为矩形框的起始坐标,如果不加这个,画矩形时只能向一个方向进行
- rect.x = MIN(x, cursor.x);
- rect.y = MIN(y, cursor.y);
- rect.width = abs(cursor.x - x);
- rect.height = abs(cursor.y - y);
- //防止矩形区域超出图像的范围
- rect &= Rect(0, 0, src.cols, src.rows);
- }
- break;
- }
- }
- int main()
- {
- src=imread("E://IM_VIDEO//kobe.jpg");
- if(src.data==0)
- {
- cout<<"the src image is not built!"<<endl;
- return -1;
- }
- namedWindow("SrcImage");
- imshow("SrcImage",src);
- setMouseCallback("SrcImage", onMouse, NULL);
- waitKey();
- return 0;
- }
运行结果如下:
<--- 视频篇 --->
- #include<opencv2\core\core.hpp>
- #include<opencv2\highgui\highgui.hpp>
- #include<opencv2\imgproc\imgproc.hpp>
- #include<iostream>
- #include<vector>
- using namespace cv;
- using namespace std;
- bool drawing_box = false;
- bool gotBox = false;
- Rect box;
- Point downPoint;
- void mouseRectHandler(int event, int x, int y, int flags, void *param)
- {
- switch (event)
- {
- case CV_EVENT_MOUSEMOVE:
- if (drawing_box)
- {
- //鼠标的移动到downPoint的右下角
- if( x >=downPoint.x && y >= downPoint.y)
- {
- box.x = downPoint.x;
- box.y = downPoint.y;
- box.width = x - downPoint.x;
- box.height = y - downPoint.y;
- }
- //鼠标的移动到downPoint的右上角
- if( x >= downPoint.x && y <= downPoint.y)
- {
- box.x = downPoint.x;
- box.y = y;
- box.width = x - downPoint.x;
- box.height = downPoint.y - y;
- }
- //鼠标的移动到downPoint的左上角
- if( x <= downPoint.x && y <= downPoint.y)
- {
- box.x = x;
- box.y = y;
- box.width = downPoint.x - x;
- box.height = downPoint.y - y;
- }
- //鼠标的移动到downPoint的左下角
- if( x <= downPoint.x && y >= downPoint.y)
- {
- box.x = x;
- box.y = downPoint.y;
- box.width = downPoint.x -x;
- box.height = y - downPoint.y;
- }
- }
- break;
- case CV_EVENT_LBUTTONDOWN:
- drawing_box = true;
- //起点
- downPoint = Point(x,y);
- break;
- case CV_EVENT_LBUTTONUP:
- //松开鼠标,结束画矩形
- drawing_box = false;
- gotBox = true;
- break;
- default:
- break;
- }
- }
- int main(int argc,char*argv[])
- {
- VideoCapture video("E://IM_VIDEO//xxx.mp4");
- if( !video.isOpened())
- return 0;
- Mat frame;
- namedWindow("face",1);
- setMouseCallback("face",mouseRectHandler,NULL);
- //画感兴趣区域
- for(;;)
- {
- video>>frame;
- if(!frame.data)
- break;
- rectangle(frame,box,Scalar(255,255,255),2);//参见绘图介绍
- imshow("face",frame);
- if(waitKey(50) == 'c')
- break;
- }
- return 0;
- }
运行结果如下:
参考:
http://blog.csdn.net/zhangping1987/article/details/51880098
http://blog.csdn.net/qq_23968185/article/details/51335291
来源: