Question

我有以下代码，我在其中加载图像，并希望根据鼠标事件的选择生成ROI图像。

    void mouseHandler(int event, int x, int y, int flags, void* param)
{
    if (event == CV_EVENT_LBUTTONDOWN && !drag)
    {
        point1 = Point(x, y);
        drag = 1;
    }

    if (event == CV_EVENT_MOUSEMOVE && drag)
    {
        Mat img1 = img.clone();
        point2 = Point(x, y);
        rectangle(img1, point1, point2, CV_RGB(255, 0, 0), 3, 8, 0);
        imshow("image", img1);
        waitKey(0);
    }

    if (event == CV_EVENT_LBUTTONUP && drag)
    {
        point2 = Point(x, y);
        rect = Rect(point1.x,point1.y,x-point1.x,y-point1.y);
        drag = 0;
        roiImg = img(rect);
    }

    if (event == CV_EVENT_LBUTTONUP)
    {
        select_flag = 1;
        drag = 0;
    }
}
int main()
{


    Mat img = imread("C:\\Users\\ashutosh\\Downloads\\Documents\\Experiments\\PL_Pizza\\0001.jpg");
    if (!img.data)
        {
            std::cout << "Image not loaded";
            return -1;
        }
   // imshow("image",img);
    while(1)
    {
        cvSetMouseCallback("image", mouseHandler, NULL);
        if (select_flag == 1)
        {
            imshow("ROI", roiImg); 
        }
        rectangle(img, rect, CV_RGB(255, 0, 0), 3, 8, 0);
        imshow("image", img);
        k = waitKey(10);
        if (k == 27)
        {
            break;
        }
    }
    return 0;
}

但我一次又一次收到以下错误：

OpenCV错误：imshow中的断言失败（size.width＆gt; 0＆amp; size.height＆gt; 0），文件C：\ opencv \ sources \ modules \ highgui \ src \ window.cpp，第281行。此应用程序已请求运行时以不寻常的方式终止它。有关更多信息，请联系应用程序的支持团队。在抛出＆＃39; cv :: Exception＆＃39;的实例后终止调用 What（）：C：\ opencv \ sources \ modules \ highgui \ src \ window.cpp：281：错误：（-215）size.width＆gt; 0＆amp;＆amp;函数imshow中的size.height＆gt; 0

请帮帮我。在此先感谢!!

Opencv错误：单击操作的imshow函数中的断言失败

0 个答案: