Non-rigid stitching functions

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

sammy
3029 ●14 ●29 ●48

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.

edit retag flag offensive close merge delete

add a comment

3

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

Kirill Kornyakov

2792 ●13 ●25 ●52

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...

edit flag offensive delete link

Comments

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

add a comment

0

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

mrgloom

813 ●9 ●22 ●39

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?

edit flag offensive delete link

Comments

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

add a comment

Non-rigid stitching functions

2 answers

Comments

Comments

Links

Question Tools

Stats

Related questions

Non-rigid stitching functions edit

2 answers

Comments

Comments

Links

Question Tools

Stats

Related questions

Non-rigid stitching functions