Non-rigid stitching functions

asked 2012-07-20 08:16:38 -0600

sammy
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updated 2012-07-20 08:17:02 -0600

Starting from a reference in this answer about elastic (non-rigid) transforms between images, I am wondering whether OpenCV supports such transforms.

So, given an image, some landmarks in it, and a new set of landmarks, it is a way to transform the image so that the old landmarks move to the new set? By elastic transform, I mean it should not be a simple homography, but a more flexible (locally adaptive) algorithm. The idea would be to create a map between the original and the destination, in such a way that the old image looks "stretched" or "squizzed"

I know algorithms that do it, and how it works, I am just curious whether such functions are available in OpenCV.

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answered 2012-07-20 10:16:37 -0600

Kirill Kornyakov

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cv::remap function can apply such transformation, but the most interesting question is now the generate the map. Here is a very gentle intro to the subject: http://docs.opencv.org/doc/tutorials/imgproc/imgtrans/remap/remap.html#remap.

So, I don't even know if OpenCV can help you with map generation, you probably should do it manually. In fact it is custom for every application: rectification, warping for stitching. You should probably study sources of such algorithms...

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I know about remap - I was interested in the process of generating such maps. But I hope the answer will be helpful for others

sammy ( 2012-07-20 11:45:39 -0600 )edit

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answered 2012-08-30 01:17:55 -0600

mrgloom

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updated 2012-08-30 02:04:40 -0600

I think you are talking about something like this? Moving Least Squares or Thin Plate Splines

also here some code for opencv http://ipwithopencv.blogspot.com/2010/01/thin-plate-spline-example.html http://ipwithopencv.googlecode.com/svn/trunk/ http://code.google.com/p/imgwarp-opencv/

I think you can generate some map and then use remap.

by the way what is other algorithms to do this?what if we have no landmarks but just pixel data?

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That is the algorithm I knew about. If you have only pixel data, that means you have the maps for remap, so all you have to do is to apply it.

sammy ( 2012-08-30 01:31:41 -0600 )edit

no, I'm talking about some algorithms that don't use landmarks but just pixel data. Maybe it's called dense optical flow I'm not sure or something correlation based.

mrgloom ( 2012-08-30 01:39:23 -0600 )edit

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Non-rigid stitching functions

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