原
OpenCV入门：ROI感兴趣区域（鼠标事件选定区域）
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OpenCV入门：ROI感兴趣区域（鼠标事件选定区域）
博客 http://blog.csdn.net/qq_23968185/article/details/51335291
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#include <iostream>
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#include "opencv2/core/core.hpp"
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#include "opencv2/imgproc/imgproc.hpp"
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#include "opencv2/highgui/highgui.hpp"
-
-
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);
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第一个参数，鼠标操作时间的整数代号，在opencv中，event鼠标事件总共有10中，从0-9依次代表如下:
-
-
EVENT_MOUSEMOVE =0, //滑动
-
EVENT_LBUTTONDOWN =1, //左键点击
-
EVENT_RBUTTONDOWN =2, //右键点击
-
EVENT_MBUTTONDOWN =3, //中间点击
-
EVENT_LBUTTONUP =4, //左键释放
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EVENT_RBUTTONUP =5, //右键释放
-
EVENT_MBUTTONUP =6, //中间释放
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EVENT_LBUTTONDBLCLK =7, //左键双击
-
EVENT_RBUTTONDBLCLK =8, //右键双击
-
EVENT_MBUTTONDBLCLK =9 //中间释放
-
-
第二个参数，代表鼠标位于窗口的(x，y)坐标位置，窗口左上角默认为原点，向右为x轴，向下为y轴；
-
第三个参数，代表鼠标的拖拽事件，以及键盘鼠标联合事件，总共有32种事件，这里不再赘述。
-
第四个参数，函数参数的编号。
-
*/
-
void onMouse(int event, int x, int y, int flags, void *param)
-
{
-
Mat img = src.clone();
-
switch (event)
-
{
-
//按下鼠标左键
-
case CV_EVENT_LBUTTONDOWN:
-
//点击鼠标图像时，清除之前ROI图像的显示窗口
-
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)
-
{
-
//将img中的矩形区域复制给roi，并显示在SignROI窗口
-
roi = img(Rect(rect.x, rect.y, rect.width, rect.height));
-
rectangle(img, rect, Scalar(
0,
0,
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(
"C:\\Users\\Phajaan\\Desktop\\bylw\\opencv\\男枪.jpg");
-
if (src.data ==
0)
-
{
-
cout <<
"图片不存在" <<
endl;
-
return
-1;
-
}
-
namedWindow(
"SrcImage");
-
imshow(
"SrcImage", src);
-
/*
-
void setMouseCallback(const string& winname, MouseCallback onMouse, void* userdata=0 );
-
Parameters:
-
第一个参数，windows视窗名称，对名为winname的视窗进行鼠标监控；
-
第二个参数，鼠标响应处理函数，监听鼠标的点击，移动，松开，判断鼠标的操作类型，并进行响应的函数处理；
-
第三个参数，鼠标响应处理函数的ID，与鼠标相应处理函数相匹配就行，暂时只用到默认为0的情况。
-
*/
-
setMouseCallback(
"SrcImage", onMouse,
NULL);
-
waitKey();
-
return
0;
-
}
效果图：
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图像感兴趣区域（ROI）提取主要使用掩模来进行。掩模是二值图像，感兴趣区域的掩模值设置为255，非感兴趣区域的掩模值为0获取掩模的方法主要有两种方法一使用opencv中Mat函数方法,调用Mat(Re... 博文 来自： 沧海一帆的专栏
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<em>opencv</em> 鼠标响应 实现在视频中画矩形框 指定跟踪目标为后续跟踪打下基础 </h4>
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此程序可以在视频中用鼠标画一个矩形框，把他视为要跟踪的 目标对象，为后续的单目标跟踪打下基础 </div>
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04-26 阅读数 4717
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11-05 阅读数 402
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这是在VC6.0上基于MFC对话框基础下，安装了opencv1.0之后可以运行的，包括打开图像，鼠标在图像上移动进行选择感兴趣区域，以及对选择出的感兴趣区域进行一项处理，即角点检测。 </div>
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