How to intersect and align pixels of two images in Matlab?

Asked Jan 10 '15 at 06:25

Active Jan 10 '15 at 06:25

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I have two images of different sizes and different world locations, like this

enter image description here

For both images I have imref2d information.

I would like to perform comparational analysis, so I need to crop both images to the same size and resample one of them so that pixels of both images align.

Are there any simple/built-in methods in matlab for this?

asked Jan 10 '15 at 06:25

Suzan Cioc

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Doesn't [`imwarp`](http://uk.mathworks.com/help/images/ref/imwarp.html) do what you need, or did I misunderstand? – Roger Rowland Jan 10 '15 at 07:21
How to calculate `tform` parameter for my task? – Suzan Cioc Jan 10 '15 at 13:51
Do you have point correspondences between the two images? – Roger Rowland Jan 10 '15 at 15:02
What are point correspondences? – Suzan Cioc Jan 10 '15 at 15:59
A set of points on one image that match a set of points on the other image. – Roger Rowland Jan 10 '15 at 16:21
All points are matching. Both images have corresponding `imref2d` object, which contains information about where they are located in world coordinates (which is depicted). – Suzan Cioc Jan 10 '15 at 16:28
Then maybe you can use estimateGeometricTransform? – Roger Rowland Jan 10 '15 at 16:50
I am not sure any transform will align pixels. – Suzan Cioc Jan 10 '15 at 16:53
I mean use it to get the tform parameter for imwarp – Roger Rowland Jan 10 '15 at 16:54
So, are you sure `imwarp` will align pixels? – Suzan Cioc Jan 10 '15 at 16:55
Also, I don't see any cutting capability in `imwarp`, do you? – Suzan Cioc Jan 10 '15 at 16:55
I think we are misunderstanding each other. If you have two images and a set of point correspondences, you can estimate the transformation and then warp one image to the same space as the other. Is this not what you need? – Roger Rowland Jan 10 '15 at 16:57
By using the same transformation to map the image corners, you can find the overlap for cropping. – Roger Rowland Jan 10 '15 at 16:59

How to intersect and align pixels of two images in Matlab?

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