Revision history [back]

Getting back to the original coordinates from a warped Image

I have four corners extracted from a image,

std::vector<cv::point2f> ecken; ecken.push_back(corners[0]); ecken.push_back(corners[size.height-1]); ecken.push_back(corners[size.area()-size.height-1]); ecken.push_back(corners[size.area()-1]); they are warped in to a second image:

quad_pts.push_back(cv::Point2f(0, 0)); quad_pts.push_back(cv::Point2f(quad.cols, 0)); quad_pts.push_back(cv::Point2f(quad.cols, quad.rows)); quad_pts.push_back(cv::Point2f(0, quad.rows));

    // Get transformation matrix
        cv::Mat transmtx = cv::getPerspectiveTransform(ecken, quad_pts);

cv::warpPerspective(src, quad, transmtx, quad.size(),1); I want to go back to the original image from the result that I get in quad, these what I've tried:

cv::Mat trans = cv::getPerspectiveTransform(quad_pts,ecken ); cv::perspectiveTransform(quad,test,trans); and it didn't work !! any idea ??

Getting back to the original coordinates from a warped Image

I have four corners extracted from a image,

quad_pts.push_back(cv::Point2f(0, 0)); quad_pts.push_back(cv::Point2f(quad.cols, 0)); quad_pts.push_back(cv::Point2f(quad.cols, quad.rows)); quad_pts.push_back(cv::Point2f(0, quad.rows));quad.rows)); // Get transformation matrix cv::Mat transmtx = cv::getPerspectiveTransform(ecken, quad_pts); cv::warpPerspective(src, quad, transmtx, quad.size(),1); cv::warpPerspective(src, quad, transmtx, quad.size(),1); I want to go back to the original image from the result that I get in quad, these what I've tried: cv::Mat trans = cv::getPerspectiveTransform(quad_pts,ecken ); cv::perspectiveTransform(quad,test,trans); and it didn't work !! any idea ??

          3    No.3 Revision 
      updated 
        2013-07-24 03:56:07 -0600
     
 
 
  
 
 
 
  Getting back to the original coordinates from a warped Image
 I have four corners extracted from a image,
 std::vector<cv::point2f> 
std::vector<cv::Point2f> ecken;
ecken.push_back(corners[0]);
ecken.push_back(corners[size.height-1]);
ecken.push_back(corners[size.area()-size.height-1]);
ecken.push_back(corners[size.area()-1]);
 they are warped in to a second image:
 quad_pts.push_back(cv::Point2f(0, 0));
            quad_pts.push_back(cv::Point2f(quad.cols, 0));
            quad_pts.push_back(cv::Point2f(quad.cols, quad.rows));
            quad_pts.push_back(cv::Point2f(0, quad.rows));

    // Get transformation matrix


      cv::Mat transmtx = cv::getPerspectiveTransform(ecken, quad_pts);
cv::warpPerspective(src, quad, transmtx, quad.size(),1);
 I want to go back to the original image from the result that I get in quad, these what I've tried:
 cv::Mat trans  = cv::getPerspectiveTransform(quad_pts,ecken );
        cv::perspectiveTransform(quad,test,trans);
 and it didn't work !! any idea ??
 
 
 
          4    retagged 
      updated 
        2020-11-13 03:52:38 -0600
     
    sturkmen  
 6772  ●3 ●48 ●79  
        https://github.com/stu...
         
 
 
 
  
 
 
 
  Getting back to the original coordinates from a warped Image
 I have four corners extracted from a image,
 std::vector<cv::Point2f> ecken;
ecken.push_back(corners[0]);
ecken.push_back(corners[size.height-1]);
ecken.push_back(corners[size.area()-size.height-1]);
ecken.push_back(corners[size.area()-1]);
 they are warped in to a second image:
 quad_pts.push_back(cv::Point2f(0, 0));
            quad_pts.push_back(cv::Point2f(quad.cols, 0));
            quad_pts.push_back(cv::Point2f(quad.cols, quad.rows));
            quad_pts.push_back(cv::Point2f(0, quad.rows));

    // Get transformation matrix


      cv::Mat transmtx = cv::getPerspectiveTransform(ecken, quad_pts);
cv::warpPerspective(src, quad, transmtx, quad.size(),1);
 I want to go back to the original image from the result that I get in quad, these what I've tried:
 cv::Mat trans  = cv::getPerspectiveTransform(quad_pts,ecken );
        cv::perspectiveTransform(quad,test,trans);
 and it didn't work !! any idea ??