如何使用 opencv 检测实时提要中的鼠标点击

Question

我是 Opencv 的新手，我正在调试一个简单的程序，该程序将使用 setMouseCallback 函数在来自摄像机的实时流上计算鼠标点击的次数和位置，但是一旦程序启动，它就会被点击并且鼠标点击的位置和次数因为鼠标的移动而不是点击而更新。我在下面包含了我的程序，如果有人指出错误并为我提供上述程序的解决方案，我将不胜感激。

#include "opencv2\highgui.hpp"
#include "opencv2\core.hpp"
#include "opencv2\imgproc.hpp"
#include <iostream>

using namespace cv;
using namespace std;

#define window "LiveFeed"
Mat frame;

void cbmouse(int event, int x, int y, int flags, void*userdata)
{
    static int count = 0;
    char text[] = "count999";
    if (event = EVENT_LBUTTONDOWN)
    {
        while (1)
        {
            circle(frame, Point(x, y), 4, Scalar(0, 0, 255), 2);
            count++;
            sprintf(text, "count%d", count);
            putText(frame, text, Point(x + 5, y + 2), FONT_HERSHEY_PLAIN, 1, Scalar(0, 0, 0), 2);
            imshow(window, frame);
            if (waitKey(33) == 27)
            break;
        }
    }
    return;
}

int main(int argc, char*argv[])
{
    VideoCapture video(0);
    namedWindow(window);
    while (1)
    {
        video >> frame;
        imshow(window, frame);
        setMouseCallback(window, cbmouse, NULL);
        if (waitKey(33) == 27)
            break;
    }
}

Answer 1

也许您只需要更正 if (event == EVENT_LBUTTONDOWN)

但我做了一些改进。请尝试下面的代码。（我不确定，您想在第一次点击时冻结实时提要吗？）

#include "opencv2\highgui.hpp"
#include "opencv2\core.hpp"
#include "opencv2\imgproc.hpp"

using namespace cv;
using namespace std;

#define window "LiveFeed"
Mat frame;

vector<Point> pts;

void drawClickedPoints( Mat img )
{

    for(size_t i = 0; i < pts.size(); i++)
    {
        circle(img, pts[i], 4, Scalar(0, 0, 255), 2);
        putText(frame, format("count%d", i), Point(pts[i].x + 5, pts[i].y + 2), FONT_HERSHEY_PLAIN, 1, Scalar(0, 0, 0), 2);
    }

}
void cbmouse(int event, int x, int y, int flags, void*userdata)
{
    if (event == EVENT_LBUTTONDOWN)
    {
        pts.push_back(Point(x,y));
    }
}

int main(int argc, char*argv[])
{
    VideoCapture video(0);
    namedWindow(window);
    setMouseCallback(window, cbmouse, NULL);
    while (1)
    {
        video >> frame;
        drawClickedPoints(frame);
        imshow(window, frame);
        if (waitKey(33) == 27)
            break;
    }
}

如何使用 opencv 检测实时提要中的鼠标点击

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