找到与整个图像相关的点的X和Y坐标

Find X and Y coordinates of point in relation to the whole image

本文关键字：坐标 图像      更新时间：2023-10-16

我试图在2D图像中找到鼻子尖端标记。它不能100％正确，但由于首先将其完全满足我。

vector<Rect> noses;
vector<Rect> faces;
vector<Rect> eyes;
Mat frame_gray;
Mat matched_frame; //frame with matched face
Mat gray;
Rect region_of_interest;
cvtColor(frame, frame_gray, COLOR_BGR2GRAY);
face_cascade.detectMultiScale(frame_gray, faces, 1.1, 2, 0 | CASCADE_SCALE_IMAGE, Size(30, 30));
for (int i = 0; i < faces.size(); i++)
{
        Point pt1(faces[i].x, faces[i].y); // Display detected faces on main window - live stream from camera
        Point pt2((faces[i].x + faces[i].height), (faces[i].y + faces[i].width));
        rectangle(frame, pt1, pt2, Scalar(255,0 , 0), 2, 8, 0);
        cvtColor(frame, frame_gray, COLOR_BGR2GRAY);
        equalizeHist( frame_gray, frame_gray );
        //NOSE TIP DETECTION
        Rect noseROI1;
        noseROI1.x = (faces[i].x);
        noseROI1.y = faces[i].y + (faces[i].height/2.5);
        noseROI1.width = (faces[i].width);
        noseROI1.height = (faces[i].height/2.8);
        Point ptNoseX(noseROI1.x, noseROI1.y);
        Point ptNoseY(noseROI1.x+noseROI1.width, noseROI1.y+noseROI1.height);
        //Rectangle around region of interest concentrated on nose
        rectangle(frame, ptNoseX,ptNoseY, Scalar(0,255,255), 2, 2, 0);
        Mat image_roi_nose = frame(noseROI1);
        nose_cascade.detectMultiScale(image_roi_nose, noses, 1.1, 2, 0 | CASCADE_SCALE_IMAGE, Size(40, 30));
        for (int i = 0; i < noses.size(); i++)
        {
            region_of_interest.x = noses[i].x;
            region_of_interest.y = noses[i].y;
            region_of_interest.width = (noses[i].width);
            region_of_interest.height = (noses[i].height);
            matched_frame = frame(region_of_interest);
            cvtColor(matched_frame, gray, CV_BGR2GRAY);
            Point pt1(noses[i].x, noses[i].y);
            Point pt2((noses[i].x + noses[i].height), (noses[i].y + noses[i].width));
            rectangle(image_roi_nose, pt1, pt2, Scalar(0, 255, 0), 2, 8, 0);
            int x1 = noses[i].x + (noses[i].height/2);
            int y1 = noses[i].y + (noses[i].width/2);

            circle(image_roi_nose, Point(x1, y1), 2, CV_RGB(255,0,0),2, 8, 0);
        }

此代码找到鼻尖，但是它返回了我的x1和y1，与Mat image_roi_nose有关，如何计算与整个图像有关的这一点的坐标？如果我的问题尚不清楚，请让我知道我会尝试用更多细节来解释它。

谢谢大家的帮助！

x = x1 + noseROI1.x;
y = y1 + noseROI1.y;
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