Getting the Affine transformations from the Stitcher
 
  
 
  
 
 
 
 
 
 asked Apr 21 '19 
 
 trttrt gravatar image  
 
 
 
 
 
Hello
 
I am interested in using OpenCV's Stitcher to create a panorama from N number of images but extracting the affine transformation from each image. Will this be possible ? I have looked in this example:
 
https://github.com/opencv/opencv/blob...
 
And I found this class that might help, https://docs.opencv.org/trunk/df/d15/...
but it only mentions rotations.. What about translation?
 
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1
read this tutorial and affine motion is here
LBerger gravatar imageLBerger (Apr 21 '19)edit
Thanks! I read this: "Affine model expecting affine transformation with 6 DOF or 4 DOF implemented in cv::detail::AffineBestOf2NearestMatcher cv::detail::AffineBasedEstimator cv::detail::BundleAdjusterAffine cv::detail::BundleAdjusterAffinePartial cv::AffineWarper"
This is what I want but how do I use the 4 DOF ? It is not clear. I know I can pass a flag "–estimator affine" but that can either use 6 DOF or 4 DOF ? I dont know which one.
trttrt gravatar imagetrttrt (Apr 21 '19)edit
1
At bottom of the page :
For images captured using a scanner or a drone ( affine motion) you can use those arguments on command line :

newspaper1.jpg newspaper2.jpg –work_megapix 0.6 –features surf –matcher affine –estimator affine –match_conf 0.3 –conf_thresh 0.3 –ba affine –ba_refine_mask xxxxx –wave_correct no –warp affine
Try with affine I think it will work. You must set affine for all parameters bundle homography and adjuster
LBerger gravatar imageLBerger (Apr 22 '19)edit
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