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copying smaller picture onto larger original frame

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Hi! I'm trying to copy a smaller picture on to the larger frame. But i can't get it to work. It compiles fine but it does not show anything. My goal is to copy the recognised face onto the larger original frame. //NEW Mat face_resized; //NEW for(int i = 0; i < faces.size(); i++) { // Process face by face: Rect face_i = faces[i]; // Crop the face from the image. So simple with OpenCV C++: Mat face = gray(face_i); // Resizing the face is necessary for Eigenfaces and Fisherfaces. You can easily // verify this, by reading through the face recognition tutorial coming with OpenCV. // Resizing IS NOT NEEDED for Local Binary Patterns Histograms, so preparing the // input data really depends on the algorithm used. // // I strongly encourage you to play around with the algorithms. See which work best // in your scenario, LBPH should always be a contender for robust face recognition. // // Since I am showing the Fisherfaces algorithm here, I also show how to resize the // face you have just found: //NEW face_resized=images[images.size()-1]; //Mat face_resized=images[images.size()-1]; //NEW cv::resize(face, face_resized, Size(im_width, im_height), 1.0, 1.0, INTER_CUBIC); //model->setLabelsInfo(labelsInfo); // Now perform the prediction, see how easy that is: int prediction = model->predict(face_resized); double confidence = 0.0; model->predict(face_resized,prediction,confidence); // And finally write all we've found out to the original image! // First of all draw a green rectangle around the detected face: rectangle(original, face_i, CV_RGB(0, 255,0), 1); And: //NEW cv::Rect roi = cv::Rect(50,50, face_resized.cols, face_resized.rows); cv::Mat subview = original(roi); subview.copyTo(original); //NEW while(tmp!=0) { putText(original, tmp->name, Point(10,y),FONT_HERSHEY_PLAIN,1.0,CV_RGB(100,100,0),1.0); y+=10; tmp=tmp->next;} } imshow("face_recognizer", original); (i only copied the relevant parts, can post more if needed). Appreciate the help.

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