Parameterization

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Melissa
Melissa on 15 Jul 2011
Good Morning All, I was wondering if there was a way to parameterize the boundary of a shape given x and y cartesian coordinates?
I was thinking of using the matlab interpft function to get x(t) and y(t) not just xt and yt so I can use it when finding the fourier transforms coefficients. Any suggestion are very much appreciated.
Thanks Mel
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Andrew Newell
Andrew Newell on 17 Jul 2011
This is a duplicate of an earlier question (http://www.mathworks.com/matlabcentral/answers/11552-fourier-transform-of-2d).

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Answers (3)

the cyclist
the cyclist on 15 Jul 2011
You might be interested in the convhull() function.

Sean de Wolski
Sean de Wolski on 15 Jul 2011
Maybe: FEX:vert2lcon_lcon2vert and the original vert2con and con2vert referenced in that link.
The shape must be convex.
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Melissa
Melissa on 15 Jul 2011
thank you, the shape is distorted representation of a circle so convex is applied. and this will give me an x(t) and y(t) to apply to my fourier transform?

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Image Analyst
Image Analyst on 17 Jul 2011
You can use bwboundaries. It gives you a parameterized boundary -- (x,y) location is parameterized as a function of array index.

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