cv::warpPerspective(frame, frame, transformation_matrix, frame.size(), INTER_LINEAR);
Mat roi(frame, Rect(roi_x, roi_y, roi_width, roi_height));
cv::warpPerspective(frame, frame, transformation_matrix, frame.size(), INTER_LINEAR);
Mat roi(frame, Rect(roi_x, roi_y, roi_width, roi_height));