物体检测后改变矩形的大小

Question

我使用下面的代码进行对象检测。

int main(int argc, char* argv[]){
VideoCapture cap(0); 
if (!cap.isOpened()){
    cout << "Cannot open the video cam" << endl;
    return -1;}
int totalFrameNumber = cap.get(CV_CAP_PROP_FRAME_COUNT);
Mat frame;
namedWindow("MyVideo", CV_WINDOW_AUTOSIZE);

while (1)
{
    bool bSuccess = cap.read(frame); // read a new frame from video

    if (!bSuccess)
    {
        cout << "Cannot read a frame from video stream" << endl;
        break;
    }
Mat frame2;

Rect rectangle2(420,280, 40, 40);
rectangle(frame, rectangle2, Scalar(255, 255, 255));
Mat cornerstrength;
    cornerHarris(frame, cornerstrength, 3, 3, 0.1);
    //threshold the corner strength
    Mat harriscorners;
    double th = 0.00001;
    threshold(cornerstrength, harriscorners, th, 255, THRESH_BINARY);
    morphologyEx(harriscorners, harriscorners, MORPH_CLOSE, Mat(), Point(-1, -1), 6);
    //local maxima detection
    Mat dilated, localMax;
    dilate(cornerstrength, dilated, Mat());
    compare(cornerstrength, dilated, localMax, CMP_EQ);
    threshold(cornerstrength, harriscorners, th, 255, THRESH_BINARY);
    harriscorners.convertTo(harriscorners, CV_8U);
    bitwise_and(harriscorners, localMax, harriscorners);
    harriscorners.convertTo(harriscorners, CV_32F);
    Mat S(0, 2, CV_32SC1);

    //drawing a circle around corners

    for (int j = 0;j < harriscorners.rows;j++)
        for (int i = 0;i < harriscorners.cols;i++)
        {

            if (harriscorners.at<float>(j, i)> 0)
            {    circle(frame, Point(i, j), 5, Scalar(255), 2, 8);
                Mat pt(1, 2, CV_32SC1);
                pt.at<int>(1, 0) = i;
                pt.at<int>(0, 1) = j;
                // Add the point to S
                S.push_back(pt);
                for (int x = 430; x < 460; x++)
                    for (int y = 285; y < 315; y++)
                        if  ((pt.at<int>(1, 0) = i) == x && (pt.at<int>(0, 1) = j) == y))


                        {
                            Rect rectangle2(430, 285, 30,30);}}}
imshow("MyVideo", frame);
if (waitKey(30) == 27)
                {
                    cout << "esc key is pressed by user" << endl;
                    break;
                }
            }

            return 0;
        }

我想要当条件 if ((pt.at(1, 0) = i) == x && (pt.at(0, 1) = j) == y))建立然后矩形2的大小从 rectangle2(420,280,40,40) 更改为 rectangle2(430,285,30,30)。我可以进行此更改，但是当我使用我的代码时新的矩形2）显示在图片中。但我只想显示新的矩形2。你有什么想法来解决我的问题吗？非常感谢..

Answer 1

正如我在 cmets 中所说，您需要创建一个克隆并保持帧几乎恒定。

所以，在这部分：

    Rect rectangle2(420,280, 40, 40);
    rectangle(frame, rectangle2, Scalar(255, 255, 255));
    Mat cornerstrength;
    cornerHarris(frame, cornerstrength, 3, 3, 0.1);

写一些类似的东西

    cv::Mat frameCopy = frame.clone();
    Rect rectangle2(420,280, 40, 40);
    rectangle(frameCopy , rectangle2, Scalar(255, 255, 255));
    Mat cornerstrength;
    cornerHarris(frameCopy , cornerstrength, 3, 3, 0.1);

那么，在这部分，我不确定它打算做什么

                for (int x = 430; x < 460; x++)
                    for (int y = 285; y < 315; y++)
                        if  ((pt.at<int>(1, 0) = i) == x && (pt.at<int>(0, 1) = j) == y))    
                        {
                            Rect rectangle2(430, 285, 30,30);
                        }
             }
         }
                            imshow("MyVideo", frame);

但可能你想用一个新的矩形显示新图像，所以你可以再做一次像以前一样的事情：

    cv::Mat anotherCopy= frame.clone();
    Rect rectangleInLoop(430,280,30,30);
    rectangle(anotherCopy, rectangleInLoop, Scalar(255, 255, 255));
    imshow("MyVideo", anotherCopy);