Morphing points based on edge of a shape in an image

Hello there,

I made a mesh and I picked up the contours of this mesh as some points and I have an MRI image. So I want to move these points based on a heart on this mri image. I have tried to read like a lot of articles on morphing, points wrapping and so on.... but they are explaining either morphing between two image or two mesh. So I am a kind of stocked.

I appreciate any idea! Sareh

[Sean de Wolski]

Picture is worth 1000 words...

[sareh]

http://hpics.li/3b95b3a This is the Mri image hold on with my mesh contours

[sareh]

http://hpics.li/aee7e41 The plot of my mesh contours

Answer 1

[Image Analyst]

Try maketform() and tformfwd(). Or else imtransform. You pass the actual point locations and the desired locations into maketform() and it gives you a transform. Then use tformfwd() to apply this transform to warp your "bad" image into your "desired" image.

ALso, see Steve's blog: http://blogs.mathworks.com/steve/2006/08/04/spatial-transformations-defining-and-applying-custom-transforms/

http://blogs.mathworks.com/steve/2006/03/07/spatial-transformations-useful-toolbox-documentation-links/

[sareh]

Thank you for your answer! but the the contours are just coordinates of vector X = [] and Y by the size of 149 values of two circles. so here the question is how to compare the coordinates X,Y with an image binary which I have made out of my original MRI?

[sareh]

I added the images for you also!

[sareh]

Actually I have found the function

[z,v] = size(pu); bw = poly2mask(X + 30 ,Y + 32 ,z,v); imshow(bw) hold on plot(X + 30,Y + 32,'.r') hold off

to make a mask of my points BUT I dont understand why some points are not placed on the correct coordinates http://hpics.li/380602d

Any idea why logical 1 points are not on my coordinats?